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Mount Vesuvius
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{{short description|Stratovolcano in the Gulf of Naples, Italy}}{{pp-vandalism|small=yes}}{{pp-move-indef}}{{Redirect|Vesuvius}}{{Use mdy dates|date=May 2014}}







factoids
| elevation_ref =| prominence = | topo =| range_coordinates = | coordinates_ref =Somma volcano>Somma-stratovolcano| age = 25,000 years before present to 1944;
age of volcano = {{circa|17,000}} years to present| volcanic_arc/belt = Campanian volcanic arc| last_eruption = March 17–23, 1944| first_ascent =| easiest_route = Walk
}}Mount Vesuvius ({{IPAc-en|pron|v|ᵻ|ˈ|s|uː|v|i|ə|s}}; {{IPA-it|ˈmonte veˈzuːvjo|}}; ; {{IPA-la|mõːs wɛˈsʊwɪ.ʊs|}}; also ' or ' in some Roman sources)WEB,weblink Definition - Numen - The Latin Lexicon - An Online Latin Dictionary - A Dictionary of the Latin Language, The Latin Lexicon, 2018-09-20, is a somma-stratovolcano located on the Gulf of Naples in Campania, Italy, about {{convert|9|km|mi|abbr=on}} east of Naples and a short distance from the shore. It is one of several volcanoes which form the Campanian volcanic arc. Vesuvius consists of a large cone partially encircled by the steep rim of a summit caldera caused by the collapse of an earlier and originally much higher structure.Mount Vesuvius is best known for its eruption in AD 79 that led to the burying and destruction of the Roman cities of Pompeii, Herculaneum, Oplontis and Stabiae, as well as several other settlements. The eruption ejected a cloud of stones, ashes and volcanic gases to a height of {{convert|33|km|mi|abbr=on}}, spewing molten rock and pulverized pumice at the rate of {{convert|6e5|m3|yd3}} per second,BOOK, Modeling Volcanic Processes: The Physics and Mathematics of Volcanism, Andrew W., Woods, Sustained explosive activity: volcanic eruption columns and hawaiian fountains, Sarah A., Fagents, Tracy K. P., Gregg, Rosaly M. C.(editors), Lopes, 158, Cambridge University Press, Cambridge, 2013, 978-0521895439, ultimately releasing a hundred thousand times the thermal energy released by the Hiroshima-Nagasaki bombings. More than 1,000 people died in the eruption, but exact numbers are unknown. The only surviving eyewitness account of the event consists of two letters by Pliny the Younger to the historian Tacitus.Vesuvius has erupted many times since and is the only volcano on the European mainland to have erupted within the last hundred years. Today, it is regarded as one of the most dangerous volcanoes in the world because of the population of 3,000,000 people living nearby, making it the most densely populated volcanic region in the world, as well as its tendency towards violent, explosive eruptions of the Plinian type.NEWS, Bill, McGuire, In the shadow of the volcano, October 16, 2003, The Guardian,weblink May 8, 2010,

Mythology

Vesuvius has a long historic and literary tradition. It was considered a divinity of the Genius type at the time of the eruption of AD 79: it appears under the inscribed name Vesuvius as a serpent in the decorative frescos of many , or household shrines, surviving from Pompeii. An inscription from CapuaCIL x.1, 3806. to indicates that he was worshipped as a power of Jupiter; that is, Jupiter Vesuvius.{{harvnb|Waldstein|1908|p=97}}The Romans regarded Mount Vesuvius to be devoted to Hercules.BOOK, The Illustrated History of Natural Disasters, Kozák, Jan, Cermák, The Illustrated History of Natural Disasters, Vladimir, 2010, 45–54, 978-90-481-3325-3, 10.1007/978-90-481-3325-3_3, Vesuvius-Somma Volcano, Bay of Naples, Italy, The historian Diodorus Siculus relates a tradition that Hercules, in the performance of his labors, passed through the country of nearby Cumae on his way to Sicily and found there a place called "the Phlegraean Plain" (Φλεγραῖον πεδίον, "plain of fire"), "from a hill which anciently vomited out fire ... now called Vesuvius."Book IV, Chapter 21. It was inhabited by bandits, "the sons of the Earth," who were giants. With the assistance of the gods he pacified the region and went on. The facts behind the tradition, if any, remain unknown, as does whether was named after it. An epigram by the poet Martial in 88 AD suggests that both Venus, patroness of Pompeii, and Hercules were worshipped in the region devastated by the eruption of 79.{{harvnb|Waldstein|1908|p=108}} re Epigram IV line 44. {{Wide image|Vesuvio landscape.jpg|900px|City of Naples with Mount Vesuvius at sunset}}

Origin of the name

' was a name of the volcano in frequent use by the authors of the late Roman Republic and the early Roman Empire. Its collateral forms were ', ', ' and '.ENCYCLOPEDIA, Vesuvius, Charlton T., Lewis, Charles, Short, Medford, MA, The Perseus Project, Tufts University, 2010, 1879, A Latin Dictionary,weblink Writers in ancient Greek used or . Many scholars since then have offered an etymology. As peoples of varying ethnicity and language occupied Campania in the Roman Iron Age, the etymology depends to a large degree on the presumption of what language was spoken there at the time. Naples was settled by Greeks, as the name ', "New City", testifies. The Oscans, a native Italic people, lived in the countryside. The Latins also competed for the occupation of Campania. Etruscan settlements were in the vicinity. Other peoples of unknown provenance are said to have been there at some time by various ancient authors.Some theories about its origin are:
  • From Greek = "not" prefixed to a root from or related to the Greek word = "I quench", in the sense of "unquenchable".BOOK, Vesuvius, John, Phillips, 7–9, Oxford, Clarendon Press, 1869,
  • From Greek = "I hurl" and "violence", "hurling violence", vesbia, taking advantage of the collateral form.BOOK, Local etymology, a derivative dictionary of geographical names, Richard Stephen, Charnock, 289, London, Houlston and Wright, 1859,
  • From an Indo-European root, eus-
< *ewes- < *(a)wes-, "shine" sense "the one who lightens", through Latin or {{nowrap|Oscan.ENCYCLOPEDIA, eus, awes, Indogermanisches etymologisches Woerterbuch, Julius, Pokorny, Julius Pokorny, A., Lubotsky, G., Starostin, 1998–2003, 1959, German, Leiden, Leiden University,weblink }}

Physical appearance

File:Vesuvius crater wall.jpg|left|thumb|A view of the crater wall of Vesuvius, with the city of Torre del GrecoTorre del GrecoVesuvius is a distinctive "humpbacked" peak, consisting of a large cone (Gran Cono) partially encircled by the steep rim of a summit caldera caused by the collapse of an earlier and originally much higher structure called Mount Somma.WEB,weblink Summary of the eruptive history of Mt. Vesuvius, Osservatorio Vesuviano, Italian National Institute of Geophysics and Volcanology, December 8, 2006,weblink" title="web.archive.org/web/20061203041501weblink">weblink December 3, 2006, The Gran Cono was produced during the A.D. 79 eruption. For this reason, the volcano is also called Somma-Vesuvius or Somma-Vesuvio.The caldera started forming during an eruption around 17,000 (or 18,300) years agoWEB,weblink" title="web.archive.org/web/20080705060119weblink">weblinkweblink July 5, 2008, Vesuvius, Italy, Volcano World, WEB,weblink" title="web.archive.org/web/20100826063343weblink">weblinkweblink The world's top volcanoes, Scenta, August 26, 2010, WEB,weblink The Pomici Di Base Eruption, Osservatorio Vesuviano, Italian National Institute of Geophysics and Volcanology, December 8, 2006,weblink" title="web.archive.org/web/20061022134001weblink">weblink October 22, 2006, and was enlarged by later paroxysmal eruptions,GVP, 211020, Vesuvius, December 8, 2006, ending in the one of AD 79. This structure has given its name to the term "somma volcano", which describes any volcano with a summit caldera surrounding a newer cone.WEB,weblink Definition of somma volcano, Volcano Live, December 11, 2006, The height of the main cone has been constantly changed by eruptions but was {{convert|1281|m|ft|abbr=on}} in 2010. Monte Somma is {{convert|1132|m|ft|abbr=on}} high, separated from the main cone by the valley of Atrio di Cavallo, which is {{convert|5|km|mi|abbr=on}} long. The slopes of the volcano are scarred by lava flows, while the rest are heavily vegetated, with scrub and forests at higher altitudes and vineyards lower down. Vesuvius is still regarded as an active volcano, although its current activity produces little more than sulfur-rich steam from vents at the bottom and walls of the crater. Vesuvius is a stratovolcano at the convergent boundary where the African Plate is being subducted beneath the Eurasian Plate. Layers of lava, ash, scoria and pumice make up the volcanic peak. Their mineralogy is variable, but generally silica-undersaturated and rich in potassium, with phonolite produced in the more explosive eruptions WEB,weblink Vesuvius, volcanotrek.com, October 29, 2010, (e.g. the eruption in 1631 displaying a complete stratigraphic and petrographic description: phonolite was firstly erupted, followed by a tephritic phonolite and finally a phonolitic tephrite).JOURNAL, Stoppa, Francesco, Principe, Claudia, Schiazza, Mariangela, Liu, Yu, Giosa, Paola, Crocetti, Sergio, 2017-03-15, Magma evolution inside the 1631 Vesuvius magma chamber and eruption triggering, Open Geosciences, 9, 1, 24–52, 10.1515/geo-2017-0003, 2391-5447, 2017OGeo....9....3S,

Formation

Vesuvius was formed as a result of the collision of two tectonic plates, the African and the Eurasian. The former was subducted beneath the latter, deeper into the earth. As the water-saturated sediments of the oceanic African plate were pushed to hotter depths inside the planet, the water boiled off and lowered the melting point of the upper mantle enough to partially melt the rocks. Because magma is less dense than the solid rock around it, it was pushed upward. Finding a weak spot at the Earth's surface, it broke through, thus forming the volcano.The volcano is one of several which form the Campanian volcanic arc. Others include Campi Flegrei, a large caldera a few kilometers to the north west, Mount Epomeo, {{convert|20|km}} to the west on the island of Ischia, and several undersea volcanoes to the south. The arc forms the southern end of a larger chain of volcanoes produced by the subduction process described above, which extends northwest along the length of Italy as far as Monte Amiata in Southern Tuscany. Vesuvius is the only one to have erupted within recent history, although some of the others have erupted within the last few hundred years. Many are either extinct or have not erupted for tens of thousands of years.

Eruptions

{{Decade Volcanoes Map}}File:Procession des reliques de Saint Janvier en 1822.jpg|thumb|Procession of Saint Januarius during an eruption of Vesuvius in 1822]]Mount Vesuvius has erupted many times. The famous eruption in AD 79 was preceded by numerous others in prehistory, including at least three significantly larger ones, the best known being the Avellino eruption around 1800 BC which engulfed several Bronze Age settlements. Since AD 79, the volcano has also erupted repeatedly, in 172, 203, 222, possibly in 303, 379, 472, 512, 536, 685, 787, around 860, around 900, 968, 991, 999, 1006, 1037, 1049, around 1073, 1139, 1150, and there may have been eruptions in 1270, 1347, and 1500.The volcano erupted again in 1631, six times in the 18th century (including 1779 and 1794), eight times in the 19th century (notably in 1872), and in 1906, 1929 and 1944. There have been no eruptions since 1944, and none of the eruptions after AD 79 were as large or destructive as the Pompeian one.The eruptions vary greatly in severity but are characterized by explosive outbursts of the kind dubbed Plinian after Pliny the Younger, a Roman writer who published a detailed description of the 79 AD eruption, including his uncle's death.Pliny the Younger, Letters 6.16. On occasion, eruptions from Vesuvius have been so large that the whole of southern Europe has been blanketed by ash; in 472 and 1631, Vesuvian ash fell on Constantinople (Istanbul), over {{convert|1200|km}} away. A few times since 1944, landslides in the crater have raised clouds of ash dust, raising false alarms of an eruption.

Before AD 79

(File:Vesuvius (erupting), Brooklyn Museum Archives.jpg|thumbnail|Vesuvius erupting. Brooklyn Museum Archives, Goodyear Archival Collection)Scientific knowledge of the geologic history of Vesuvius comes from core samples taken from a {{convert|2000|m|ft|abbr=on}} plus bore hole on the flanks of the volcano, extending into Mesozoic rock. Cores were dated by potassium–argon and argon–argon dating.{{harvnb|Guest|2003|p=45}} The area has been subject to volcanic activity for at least 400,000 years; the lowest layer of eruption material from the Somma caldera lies on top of the 40,000 year‑old Campanian ignimbrite produced by the Campi Flegrei complex.
  • 25,000 years ago: Vesuvius started forming in the Codola Plinian eruption.
  • Vesuvius was then built up by a series of lava flows, with some smaller explosive eruptions interspersed between them.
  • About 19,000 years ago: the style of eruption changed to a sequence of large explosive Plinian eruptions, of which the AD 79 one was the most recent. The eruptions are named after the tephra deposits produced by them, which in turn are named after the place where the deposits were first identified:{{harvnb|Guest|2003|p=47}}
  • 18,300 years ago: the Basal Pumice (Pomici di Base) eruption, VEI 6, the original formation of the Somma caldera. The eruption was followed by a period of much less violent, lava-producing eruptions.
  • 16,000 years ago: the Green Pumice (Pomici Verdoline) eruption, VEI 5.
  • Around 11,000 years ago: the Lagno Amendolare eruption, smaller than the Mercato eruption.
  • 8,000 years ago: the Mercato eruption (Pomici di Mercato) – also known as Pomici Gemelle or Pomici Ottaviano, VEI 6.
  • Around 5,000 years ago: two explosive eruptions smaller than the Avellino eruption.
  • 3,800 years ago: the Avellino eruption (Pomici di Avellino), VEI 5; its vent was apparently {{convert|2|km|mi|abbr=on}} west of the current crater and the eruption destroyed several Bronze Age settlements of the Apennine culture. Several carbon dates on wood and bones offer a range of possible dates of about 500 years in the mid-2nd millennium BC. In May 2001, near Nola, Italian archaeologists using the technique of filling every cavity with plaster or substitute compound recovered some remarkably well-preserved forms of perishable objects, such as fence rails, a bucket and especially in the vicinity thousands of human footprints pointing into the Apennines to the north. The settlement had huts, pots and goats. The residents had hastily abandoned the village, leaving it to be buried under pumice and ash in much the same way that Pompeii and Herculaneum were later preserved.WEB,weblinkweblink July 7, 2012, An ancient Bronze Age village (3500 bp) destroyed by the pumice eruption in Avellino (Nola-Campania), Claude Albore, Livadie, Meridie, December 8, 2006, yes, mdy-all, WEB,weblink Vesuvius' Next Eruption May Put Metro Naples at Risk – Lesson from Katrina is need to focus on "maximum probable hazard", State University of New York, December 8, 2006, Pyroclastic surge deposits were distributed to the northwest of the vent, travelling as far as {{convert|15|km|mi|abbr=on}} from it, and lie up to {{convert|3|m|ft|abbr=on}} deep in the area now occupied by Naples.WEB,weblinkweblink" title="web.archive.org/web/20100918021855weblink">weblink September 18, 2010, Pomici di Avellino eruption, Osservatorio Vesuviano, Italian National Institute of Geophysics and Volcanology, December 8, 2006,
  • The volcano then entered a stage of more frequent, but less violent eruptions, until the most recent Plinian eruption, which destroyed Pompeii and Herculaneum.
  • The last of these may have been in 217 BC. There were earthquakes in Italy during that year and the sun was reported as being dimmed by gray haze or dry fog. Plutarch wrote of the sky being on fire near Naples and Silius Italicus mentioned in his epic poem PunicaJOURNAL, Stothers, R.B., 2002, The case for an eruption of Vesuvius in 217 BC (abstract), Ancient Hist. Bull., 16, 182–185, Klenk, Hans-Peter, harv, that Vesuvius had thundered and produced flames worthy of Mount Etna in that year, although both authors were writing around 250 years later. Greenland ice core samples of around that period show relatively high acidity, which is assumed to have been caused by atmospheric hydrogen sulfide.BOOK, Volcanoes in Human History, Princeton University Press, 2002, de Boer, Jelle Zeilinga & Sanders, Donald Theodore, 978-0-691-05081-2,
File:Pompeii - Casa del Centenario - MAN.jpg|thumb|upright|Fresco of Bacchus and Agathodaemon with Mount Vesuvius, as seen in PompeiiPompeiiThe volcano was then quiet (for 295 years, if the 217 BC date for the last previous eruption is true) and was described by Roman writers as having been covered with gardens and vineyards, except at the top, which was craggy. The volcano may have had only one summit at that time, judging by a wall painting, "Bacchus and Vesuvius", found in a Pompeian house, the House of the Centenary (Casa del Centenario).Several surviving works written over the 200 years preceding the AD 79 eruption describe the mountain as having had a volcanic nature, although Pliny the Elder did not depict the mountain in this way in his Naturalis Historia:Pliny the Elder, The Natural History (eds. John Bostock (physician)|John Bostock], Henry Thomas Riley)] (translation)
  • The Greek historian Strabo (ca 63 BC–AD 24) described the mountain in Book V, Chapter 4 of his GeographicaStrabo: Geography Book V Chapter 4 (translation) as having a predominantly flat, barren summit covered with sooty, ash-coloured rocks and suggested that it might once have had "craters of fire". He also perceptively suggested that the fertility of the surrounding slopes may be due to volcanic activity, as at Mount Etna.
  • In Book II of De architectura,Marcus Vitruvius Pollio: de Architectura, Book II (translation) the architect Vitruvius (c.a. 80–70 BC -?) reported that fires had once existed abundantly below the peak and that it had spouted fire onto the surrounding fields. He went on to describe Pompeiian pumice as having been burnt from another species of stone.
  • Diodorus Siculus (c.a. 90 BC–c.a. 30 BC), another Greek writer, wrote in Book IV of his Bibliotheca Historica that the Campanian plain was called fiery (Phlegrean) because of the peak, Vesuvius, which had spouted flames like Etna and showed signs of the fire that had burnt in ancient history.WEB,weblink Somma-Vesuvius, Department of Physics, University of Rome, December 8, 2006,

Eruption of AD 79

In AD 79 Vesuvius erupted in one of the most catastrophic and famous eruptions of all time. Historians have learned about the eruption from the eyewitness account of Pliny the Younger, a Roman administrator and poet who dated the eruption to August 24th. New evidence, however, suggests that this eruption may have occurred on October 24th.NEWS,weblink Pompeii: Vesuvius eruption may have been later than thought, October 16, 2018, BBC, The volcano ejected a cloud of stones, ashes and volcanic gases to a height of {{convert|33|km|mi|abbr=on}}, spewing molten rock and pulverized pumice at the rate of {{convert|6e5|m3|yd3}} per second, ultimately releasing a hundred thousand times the thermal energy released by the Hiroshima-Nagasaki bombings.NEWS,weblink Science: Man of Pompeii, Time (magazine), Time, October 15, 1956, February 4, 2011, The cities of Pompeii and Herculaneum were destroyed by pyroclastic surges and the ruins buried under tens of metres of tephra.WEB,weblink Pompeii: Portents of Disaster, BBC History, Andrew, Wallace-Hadrill, October 15, 2010, February 4, 2011,

Precursors and foreshocks

The AD 79 eruption was preceded by a powerful earthquake in 62, which caused widespread destruction around the Bay of Naples, and particularly to Pompeii.BOOK, Martini, Kirk, Patterns of Reconstruction at Pompeii, September 1998, Pompeii Forum Project, Institute for Advanced Technology in the Humanities (IATH), University of Virginia, 2: Identifying Potential Damage Events,weblink harv, Some of the damage had still not been repaired when the volcano erupted. The deaths of 600 sheep from "tainted air" in the vicinity of Pompeii indicates that the earthquake of AD 62 may have been related to new activity by Vesuvius{{Sfn |Sigurdsson|2002|p=35 | ps = on Seneca the Younger, Natural Questions, 6.1, 6.27.}}The Romans grew accustomed to minor earth tremors in the region; the writer Pliny the Younger even wrote that they "were not particularly alarming because they are frequent in Campania". Small earthquakes started taking place on 20 August 79WEB,weblink Visiting Pompeii – AD 79 – Vesuvius explodes, Rick, Jones, Current Archeology, 2004–2010, Current Publishing, London, May 27, 2010, yes,weblink" title="web.archive.org/web/20120308100010weblink">weblink March 8, 2012, mdy-all, becoming more frequent over the next four days, but the warnings were not recognized.{{Efn | The dates of the earthquakes and of the eruption are contingent on a final determination of the time of year, but there is no reason to change the relative sequence.}}

Scientific analysis of the eruption

(File:Mt Vesuvius 79 AD eruption.svg|left|thumb|Pompeii and Herculaneum, as well as other cities affected by the eruption of Mount Vesuvius. The black cloud represents the general distribution of ash, pumice and cinders. Modern coast lines are shown.)Reconstructions of the eruption and its effects vary considerably in the details but have the same overall features. The eruption lasted two days. The morning of the first day was perceived as normal by the only eyewitness to leave a surviving document, Pliny the Younger. In the middle of the day an explosion threw up a high-altitude column from which ash and pumice began to fall, blanketing the area. Rescues and escapes occurred during this time. At some time in the night or early the next day pyroclastic surges in the close vicinity of the volcano began. Lights were seen on the peak interpreted as fires. People as far away as Misenum fled for their lives. The flows were rapid-moving, dense and very hot, knocking down wholly or partly all structures in their path, incinerating or suffocating all population remaining there and altering the landscape, including the coastline. These were accompanied by additional light tremors and a mild tsunami in the Bay of Naples. By late afternoon of the second day, the eruption was over, leaving only haze in the atmosphere through which the sun shone weakly.The latest scientific studies of the ash produced by Vesuvius reveals a multi-phase eruption.{{harvnb|Sigurdsson|2002}} The initial major explosion produced a column of ash and pumice ranging between {{convert|15|and|30|km|ft}} high, which rained on Pompeii to the southeast but not on Herculaneum upwind. The chief energy supporting the column came from the escape of steam superheated by the magma, created from seawater seeping over time into the deep faults of the region, that came into interaction with magma and heat.Subsequently, the cloud collapsed as the gases expanded and lost their capability to support their solid contents, releasing it as a pyroclastic surge, which first reached Herculaneum but not Pompeii. Additional blasts reinstituted the column. The eruption alternated between Plinian and Peléan six times. Surges 3 and 4 are believed by the authors to have buried Pompeii.{{harvnb|Sigurdsson|2002|pp=42–43}} Surges are identified in the deposits by dune and cross-bedding formations, which are not produced by fallout.Another study used the magnetic characteristics of over 200 samples of roof-tile and plaster fragments collected around Pompeii to estimate equilibrium temperature of the pyroclastic flow.{{harvnb|Zanella|2007|p=5}} The magnetic study revealed that on the first day of the eruption a fall of white pumice containing clastic fragments of up to {{convert|3|cm|in}} fell for several hours.{{harvnb|Zanella|2007|p=3}} It heated the roof tiles up to {{convert|140|C}}.{{harvnb|Zanella|2007|p=12}} This period would have been the last opportunity to escape.The collapse of the Plinian columns on the second day caused pyroclastic density currents (PDCs) that devastated Herculaneum and Pompeii. The depositional temperature of these pyroclastic surges ranged up to {{convert|300|C}}.{{harvnb|Zanella|2007|p=13}} Any population remaining in structural refuges could not have escaped, as the city was surrounded by gases of incinerating temperatures. The lowest temperatures were in rooms under collapsed roofs. These were as low as {{convert|100|C}}.{{harvnb|Zanella|2007|p=14}}

The Two Plinys

The only surviving eyewitness account of the event consists of two letters by Pliny the Younger to the historian Tacitus.BOOK, C. Plinii Caecilii Secundi, Epistularum, Liber Sextus; 16 & 20,weblink The Latin Library, Pliny the Younger describes, amongst other things, the last days in the life of his uncle, Pliny the Elder. Observing the first volcanic activity from Misenum across the Bay of Naples from the volcano, approximately {{convert|35|km}}, the elder Pliny launched a rescue fleet and went himself to the rescue of a personal friend. His nephew declined to join the party. One of the nephew's letters relates what he could discover from witnesses of his uncle's experiences.JOURNAL, Pliny the Younger, Charles W. Eliot (Editor), Letters LXV. To Tacitus, The Harvard Classics, 2001, 1909–14, IX Part 4, New York, Bartelby.com,weblink harv, BOOK, Gaius Plinius Caecilius Secundus (Pliny the Younger), LETTERS OF PLINY, LXV,weblink Letters of Pliny, Project Gutenberg, 3 October 2016, September 2001, In a second letter the younger Pliny details his own observations after the departure of his uncle.JOURNAL, Pliny the Younger, Charles W. Eliot (Editor), Letters LXVI. To Cornelius Tacitus, The Harvard Classics, 2001, 1909–14, IX Part 4, New York, Bartelby.com,weblink harv, BOOK, Gaius Plinius Caecilius Secundus (Pliny the Younger), LETTERS OF PLINY, LXVI,weblink Letters of Pliny, Project Gutenberg, 3 October 2016, September 2001, The two men saw an extraordinarily dense cloud rising rapidly above the peak. This cloud and a request by a messenger for an evacuation by sea prompted the elder Pliny to order rescue operations in which he sailed away to participate. His nephew attempted to resume a normal life, but that night a tremor awoke him and his mother, prompting them to abandon the house for the courtyard. Further tremors near dawn caused the population to abandon the village and caused disastrous wave action in the Bay of Naples.The early light was obscured by a black cloud through which shone flashes, which Pliny likens to sheet lightning, but more extensive. The cloud obscured Point Misenum near at hand and the island of Capraia (Capri) across the bay. Fearing for their lives, the population began to call to each other and move back from the coast along the road. A rain of ash fell, causing Pliny to shake it off periodically to avoid being buried. Later that same day the pumice and ash stopped falling and the sun shone weakly through the cloud, encouraging Pliny and his mother to return to their home and wait for news of Pliny the Elder.Pliny's uncle Pliny the Elder was in command of the Roman fleet at Misenum, and had meanwhile decided to investigate the phenomenon at close hand in a light vessel. As the ship was preparing to leave the area, a messenger came from his friend Rectina (wife of TasciusWEB,weblink Pliny Letter 6.16, May 11, 2015,weblink" title="web.archive.org/web/20150511070405weblink">weblink May 11, 2015, yes, mdy-all, ) living on the coast near the foot of the volcano explaining that her party could only get away by sea and asking for rescue. Pliny ordered the immediate launching of the fleet galleys to the evacuation of the coast. He continued in his light ship to the rescue of Rectina's party.He set off across the bay but in the shallows on the other side encountered thick showers of hot cinders, lumps of pumice and pieces of rock. Advised by the helmsman to turn back, he stated "Fortune favors the brave" and ordered him to continue on to Stabiae (about 4.5 kilometers from Pompeii).Pliny the Elder and his party saw flames coming from several parts of the crater. After staying overnight, the party was driven from the building by an accumulation of material, presumably tephra, which threatened to block all egress. They woke Pliny, who had been napping and emitting loud snoring. They elected to take to the fields with pillows tied to their heads to protect them from the raining debris. They approached the beach again but the wind prevented the ships from leaving. Pliny sat down on a sail that had been spread for him and could not rise even with assistance when his friends departed. Though Pliny the Elder died, his friends ultimately escaped by land.WEB,weblink Richard V. Fisher and volunteers, Derivation of the name "Plinian", The Volcano Information Center, University of California at Santa Barbara, Department of Geological Sciences, May 15, 2010, In the first letter to Tacitus, Pliny the Younger suggested that his uncle's death was due to the reaction of his weak lungs to a cloud of poisonous, sulphurous gas that wafted over the group. However, Stabiae was 16 km from the vent (roughly where the modern town of Castellammare di Stabia is situated) and his companions were apparently unaffected by the volcanic gases, and so it is more likely that the corpulent Pliny died from some other cause, such as a stroke or heart attack.WEB,weblinkweblink July 7, 2012, Lecture 19: Greek, Carthaginian and Roman Agricultural Writers, History of Horticulture, 2002, Jules, Janick, Purdue University, May 15, 2010, yes, mdy-all, His body was found with no apparent injuries on the next day, after dispersal of the plume.{{further information|Pliny the Elder}}

Casualties from the eruption

(File:Pompeii&Vesuvius.JPG|thumb|Pompeii, with Vesuvius towering above)Along with Pliny the Elder, the only other noble casualties of the eruption to be known by name were Agrippa (a son of the Herodian Jewish princess Drusilla and the procurator Antonius Felix) and his wife.BOOK, Flavius, Josephus, Josephus, Jewish Antiquities, xx.7.2, 94, Jewish Antiquities, Also known to have been mentioned in a section now lost.By 2003, around 1,044 casts made from impressions of bodies in the ash deposits had been recovered in and around Pompeii, with the scattered bones of another 100.JOURNAL, Episodes, 26, September 2003,weblink The eruption of Vesuvius of 79 AD and its impact on human environment in Pompei, Lisetta, Giacomelli, Annamaria, Perrotta, Roberto, Scandone, Claudio, Scarpati, May 12, 2010, harv,weblink" title="web.archive.org/web/20110117200703weblink">weblink January 17, 2011, yes, mdy-all, The remains of about 332 bodies have been found at Herculaneum (300 in arched vaults discovered in 1980).WEB,weblinkweblink" title="web.archive.org/web/20090318012551weblink">weblink March 18, 2009, Pompeii, Stories from an eruption: Herculaneum, 2007, The Field Museum of Natural History, Chicago, Soprintendenza archeologica di Pompei, May 12, 2010, What percentage these numbers are of the total dead or the percentage of the dead to the total number at risk remain completely unknown.Thirty-eight percent of the 1,044 were found in the ash fall deposits, the majority inside buildings. These are thought to have been killed mainly by roof collapses, with the smaller number of victims found outside of buildings probably being killed by falling roof slates or by larger rocks thrown out by the volcano. The remaining 62% of remains found at Pompeii were in the pyroclastic surge deposits, and thus were probably killed by them – probably from a combination of suffocation through ash inhalation and blast and debris thrown around. In contrast to the victims found at Herculaneum, examination of cloth, frescoes and skeletons show that it is unlikely that high temperatures were a significant cause. Herculaneum, which was much closer to the crater, was saved from tephra falls by the wind direction, but was buried under {{convert |23|m}} of material deposited by pyroclastic surges. It is likely that most, or all, of the known victims in this town were killed by the surges.People caught on the former seashore by the first surge died of thermal shock. The rest were concentrated in arched chambers at a density of as high as 3 persons per square metre. As only {{convert|85|m|ft}} of the coast have been excavated, casualties may be waiting to be excavated.

Later eruptions from the 3rd to the 19th centuries

File:Dankaerts-Historis-9322.tif|thumb|Eruption of 16 December 1631. Joachim von Sandrart and Matthias MerianMatthias MerianFile:Joseph Wright of Derby - Vesuvius from Portici.jpg|right|thumb|An eruption of Vesuvius seen from Portici, by Joseph Wright (ca. 1774-6)]]Since the eruption of AD 79, Vesuvius has erupted around three dozen times. It erupted again in 203, during the lifetime of the historian Cassius Dio. In 472, it ejected such a volume of ash that ashfalls were reported as far away as Constantinople. The eruptions of 512 were so severe that those inhabiting the slopes of Vesuvius were granted exemption from taxes by Theodoric the Great, the Gothic king of Italy. Further eruptions were recorded in 787, 968, 991, 999, 1007 and 1036 with the first recorded lava flows. The volcano became quiescent at the end of the 13th century and in the following years it again became covered with gardens and vineyards as of old. Even the inside of the crater was moderately filled with shrubbery.Vesuvius entered a new phase in December 1631, when a major eruption buried many villages under lava flows, killing around 3,000 people. Torrents of lahar were also created, adding to the devastation. Activity thereafter became almost continuous, with relatively severe eruptions occurring in 1660, 1682, 1694, 1698, 1707, 1737, 1760, 1767, 1779, 1794, 1822, 1834, 1839, 1850, 1855, 1861, 1868, 1872, 1906, 1926, 1929, and 1944.

Eruptions in the 20th century

File:Mt Vesuvius Erupting 1944.jpg|left|thumb|upright|The March 1944 eruption of Vesuvius, by Jack Reinhardt, B-24 tailgunner in the USAAF during World War IIWorld War IIThe eruption of April 5 in 1906Vesuvius Causes Terror; Loud Detonations and Frequent Earthquakes, The New York Times, April 6, 1906Vesuvius Threatens Destruction Of Towns; Bosco Trecase Abandoned, The New York Times, April 7, 1906 killed more than 100 people and ejected the most lava ever recorded from a Vesuvian eruption. Italian authorities were preparing to hold the 1908 Summer Olympics when Mount Vesuvius violently erupted, devastating the city of Naples and surrounding comunes. Funds were diverted to the reconstruction of Naples, requiring a new location for the Olympics to be found.Vesuvius was active from 1913 through 1944, with lava filling the crater and occasional outflows of small amounts of lava.JOURNAL, Journal of Volcanology and Geothermal Research, 58, 1, 1993, 5–25, Mount Vesuvius: 2000 years of volcanological observations, Roberto, Scandone, Lisetta, Giacomelli, Paolo, Gasparini,weblink 1993JVGR...58....5S, 10.1016/0377-0273(93)90099-D, The eruptive period ended in the major eruption of March 1944, which destroyed the villages of San Sebastiano al Vesuvio, Massa di Somma, and Ottaviano, and part of San Giorgio a Cremano.VIDEO,weblink Mt Vesuvius erupts near Naples, Italy in 1944, Stevens, Robert, The Travel Film Archive, Castle Films, YouTube, Naples, 1944, From March 18 to 23, 1944, lava flows appeared within the rim. There were outflows. Small explosions then occurred until the major explosion took place on March 18, 1944.WEB,weblink The eruption of vesuvius of March 1944, Esplora i Vulcani Italiani, 1996–2009, Giacomelli, L., Scandone, R., Dipartimento di Fisica E. Amaldi, Università Roma Tre, May 9, 2010,weblink" title="web.archive.org/web/20091230060643weblink">weblink 2009-12-30, At the time of the eruption, the United States Army Air Forces (USAAF) 340th Bombardment Group was based at Pompeii Airfield near Terzigno, Italy, just a few kilometres from the eastern base of the volcano. The tephra and hot ash damaged the fabric control surfaces, the engines, the Plexiglas windscreens and the gun turrets of the 340th's B-25 Mitchell medium bombers. Estimates ranged from 78 to 88 aircraft destroyed.WEB, The Mount Vesuvius Eruption of March 1944, Don, Kaiser,weblink (File:340th Bombardment Group B-25 Mitchell covered with ash from Mount Vesuvius.jpg|upright|thumb|Ash is swept off the wings of an American B-25 Mitchell medium bomber of the 340th Bombardment Group on March 23, 1944 after the eruption of Mount Vesuvius.)The eruption could be seen from Naples. Different perspectives and the damage caused to the local villages were recorded by USAAF photographers and other personnel based nearer to the volcano.WEB, Melvin C. Shaffer World War II Photographs,weblink Central University Library (CUL), Southern Methodist University (SMU),

Future

Large Vesuvian eruptions which emit volcanic material in quantities of about {{convert|1|km3}}, the most recent of which overwhelmed Pompeii and Herculaneum, have happened after periods of inactivity of a few thousand years. Sub-Plinian eruptions producing about {{convert|0.1|km3}}, such as those of 472 and 1631, have been more frequent with a few hundred years between them. From the 1631 eruption until 1944, there was a comparatively small eruption every few years, emitting 0.001–0.01 km³ of magma. It seems that for Vesuvius, the amount of magma expelled in an eruption increases very roughly linearly with the interval since the previous one, and at a rate of around {{convert|0.001|km3}} for each year.BOOK, Italian Volcanoes, Terra Publishing, 2001, Kilburn, Chris, McGuire, Bill, yes, 978-1-903544-04-4, This gives an approximate figure of {{convert|0.075|km3}} for an eruption after 75 years of inactivity.Magma sitting in an underground chamber for many years will start to see higher melting point constituents such as olivine crystallizing out. The effect is to increase the concentration of dissolved gases (mostly sulfur dioxide and carbon dioxide) in the remaining liquid magma, making the subsequent eruption more violent. As gas-rich magma approaches the surface during an eruption, the huge drop in internal pressure caused by the reduction in weight of the overlying rock (which drops to zero at the surface) causes the gases to come out of solution, the volume of gas increasing explosively from nothing to perhaps many times that of the accompanying magma. Additionally, the removal of the higher melting point material will raise the concentration of felsic components such as silicates potentially making the magma more viscous, adding to the explosive nature of the eruption.(File:Naplesbay01.jpg|thumb|left|The area around the volcano is now densely populated.)The government emergency plan for an eruption therefore assumes that the worst case will be an eruption of similar size and type to the 1631 VEI 4WEB,weblink Activity of Vesuvio between 1631 and 1799, Esplora i Vulcani Italiani, 1996–2009, Giacomelli, L., Scandone, R., Dipartimento di Fisica E. Amaldi, Università Roma Tre, May 9, 2010, eruption. In this scenario, the slopes of the volcano, extending out to about {{convert|7|km}} from the vent, may be exposed to pyroclastic surges sweeping down them, whilst much of the surrounding area could suffer from tephra falls. Because of prevailing winds, towns and cities to the south and east of the volcano are most at risk from this, and it is assumed that tephra accumulation exceeding {{convert|100|kg/m²}}—at which point people are at risk from collapsing roofs—may extend out as far as Avellino to the east or Salerno to the south-east. Towards Naples, to the north west, this tephra fall hazard is assumed to extend barely past the slopes of the volcano. The specific areas actually affected by the ash cloud depend upon the particular circumstances surrounding the eruption.The plan assumes between 2 weeks' and 20 days' notice of an eruption and foresees the emergency evacuation of 600,000 people, almost entirely comprising all those living in the zona rossa ("red zone"), i.e. at greatest risk from pyroclastic flows. The evacuation, by train, ferry, car, and bus, is planned to take about seven days, and the evacuees would mostly be sent to other parts of the country rather than to safe areas in the local Campania region, and may have to stay away for several months. However, the dilemma that would face those implementing the plan is when to start this massive evacuation: If it starts too late, thousands could be killed; whereas if it is started too early, the indicators of an eruption may turn out to be a false alarm. In 1984, 40,000 people were evacuated from the Campi Flegrei area, another volcanic complex near Naples, but no eruption occurred.(File:The crater of Vesuvius in 2012 (composite photograph).jpg|thumb|The crater of Vesuvius in 2012)Ongoing efforts are being made by the government at various levels (especially of Campania) to reduce the population living in the red zone, by demolishing illegally constructed buildings, establishing a national park around the whole volcano to prevent the future construction of buildingsNEWS,weblink Italians trying to prevent a modern Pompeii, Ellen, Hale, USA Today, October 21, 2003, May 8, 2010, Gannett Co. Inc., and by offering sufficient financial incentives to people for moving away.NEWS,weblink Italy ready to pay to clear slopes of volcano, Sophie, Arie, June 5, 2003, The Guardian, London, May 12, 2010, One of the underlying goals is to reduce the time needed to evacuate the area, over the next twenty to thirty years, to two or three days.CONFERENCE,weblinkweblink December 4, 2009, Early Warning of Volcanic eruptions and Earthquakes in the Neapolitan area, Campania Region, South Italy (Submitted Abstract), Paolo, Gasparini, Barberi, Franco; Belli, Attilio, October 16–18, 2003, Second International Conference on Early Warning (EWCII),weblink" title="web.archive.org/web/20081009131249weblink">weblink Bonn, Germany, PDF, May 8, 2010, yes, mdy-all, The volcano is closely monitored by the Osservatorio Vesuvio in Naples with extensive networks of seismic and gravimetric stations, a combination of a GPS-based geodetic array and satellite-based synthetic aperture radar to measure ground movement and by local surveys and chemical analyses of gases emitted from fumaroles. All of this is intended to track magma rising underneath the volcano. No magma has been detected within 10 km of the surface, and so the volcano is classified by the Observatory as at a Basic or Green Level.WEB,weblink Vesuvius, Naples, Osservatorio Vesuviano, Italian National Institute of Geophysics and Volcanology, May 8, 2010,weblink" title="web.archive.org/web/20100502075328weblink">weblink May 2, 2010,

Vesuvius today

File:Knackstedt & Näther Stereoskopie 1355 Italien. Drahtseilbahn auf den Vesuv. Bildseite.jpg|thumb|Funicular cable cars on Mount Vesuvius;stereoscopystereoscopyThe area around Vesuvius was officially declared a national park on June 5, 1995.WEB, The National Park,weblink Vesuvioinrete.it, 2001–2010, May 7, 2010, The summit of Vesuvius is open to visitors and there is a small network of paths around the volcano that are maintained by the park authorities on weekends. There is access by road to within {{convert|200|m}} of the summit (measured vertically), but thereafter access is on foot only. There is a spiral walkway around the volcano from the road to the crater.

Funiculì, Funiculà

The first funicular cable car on Mount Vesuvius opened in 1880. It was later destroyed by the March 1944 eruption. "Funiculì, Funiculà", a famous Neapolitan language song with lyrics by journalist Peppino Turco set to music by composer Luigi Denza, commemorates its opening.

See also

Notes

{{Notelist}}

References

{{Reflist}}

Bibliography

  • BOOK, John, Guest, Paul, Cole, Angus, Duncan, David, Chester, Volcanoes of Southern Italy, The Geological Society, London, 2003, Chapter 2: Vesuvius, 25–62, CITEREFGuest2003,
  • BOOK, The natural history of Pompeii, Wilhelmina Mary Feemster, Jashemski, Frederick Gustav, Meyer, Mount Vesuvius before the Disaster, Haraldur, Sigurdsson, Cambridge UK, The Press Syndicate of the University of Cambridge, 2002, 29–36, CITEREFSigurdsson2002,
  • BOOK, The natural history of Pompeii, Wilhelmina Mary Feemster, Jashemski, Frederick Gustav, Meyer, The Eruption of Vesuvius in AD 79, Haraldur, Sigurdsson, Steven, Carey, Cambridge UK, The Press Syndicate of the University of Cambridge, 2002, 37–64, CITEREFSigurdssonCarey2002,
  • BOOK, Herculaneum, past, present & future, Sir Charles, Waldstein, Leonard Knollys Haywood, Shoobridge, London, Macmillan and Co, 1908, CITEREFWaldstein1908,
  • JOURNAL, E., Zanella, L., Gurioli, M.T., Pareschi, R., Lanza, Influences of urban fabric on pyroclastic density currents at Pompeii (Italy): Part II: temperature of the deposits and hazard implications, Journal of Geophysical Research, 2007,weblink CITEREFZanella2007, 112, B5, B05214, 10.1029/2006jb004775, 2007JGRB..112.5214Z,

External links

{{Commons|Vesuvio}}
  • WEB,weblink Places: 433189 (Vesuvius M.), Purcell, N., R. Talbert, T. Elliott, S. Gillies, March 8, 2012, Pleiades, 2015-03-20,
  • NEWS, Fraser, Christian, Vesuvius escape plan 'insufficient', BBC News, Naples, BBC, January 10, 2007,weblink May 11, 2010,
  • JOURNAL,weblink Vesuvius' next eruption, Geotimes, April 2005, December 8, 2006, Garrett, Roger A., Klenk, Hans-Peter, harv, yes,weblink" title="web.archive.org/web/20070512192957weblink">weblink May 12, 2007, mdy-all,
  • WEB, Vesuvius: The making of a catastrophe: Il problema ignorato,weblink Global Volcanic and Environmental Systems Simulation (GVES), 1996–2003,
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