Mount Vesuvius

Mount Vesuvius
Mount Vesuvius
Highest point
Elevation	1,281 m (4,203 ft)
Prominence	1,232 m (4,042 ft)
Coordinates	40°49′17″N 14°25′34″E / 40.82139°N 14.42611°E / 40.82139; 14.42611
Naming
Native name	Vesuvio (Italian) Vesuvio (Neapolitan)
Geography
Mount Vesuvius Campania, Italy
Location	Campania, Italy
Geology
Age of rock	25,000 years before present to 1944; age of volcano = c. 17,000 years to present
Mountain type	Somma-stratovolcano
Volcanic arc/belt	Campanian volcanic arc
Last eruption	17–23 March 1944
Climbing
Easiest route	Walk

Mount Vesuvius (/vɪˈsuːviəs/ viss-OO-vee-əs)^[a] is a somma-stratovolcano located on the Gulf of Naples in Campania, Italy, about 9 km (5.6 mi) east of Naples and a short distance from the shore. It is one of several volcanoes forming the Campanian volcanic arc. Vesuvius consists of a large cone partially encircled by the steep rim of a summit caldera, resulting from the collapse of an earlier, much higher structure.

The

Vesuvius has erupted many times since. It is the only volcano on Europe's mainland to have erupted in the last hundred years. It is regarded as one of the most dangerous volcanoes in the world because 3,000,000 people live near enough to be affected by an eruption, with at least 600,000 in the danger zone. This is the most densely populated volcanic region in the world. Eruptions tend to be violent and explosive; these are known as Plinian eruptions.^[7]

Mythology

Vesuvius has a long historic and literary tradition. It was considered a divinity of the

The Romans regarded Mount Vesuvius as being devoted to Hercules.^[10] 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, "fiery"), "from the mountain which of old spouted forth a huge fire [...] the mountain is called Vesuvius."^[11] It was inhabited by giant bandits, "the sons of the Earth. With the gods' assistance, he pacified the region and continued. The facts behind the tradition, if any, remain unknown, as does whether Herculaneum 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.^[12]

City of Naples with Mount Vesuvius

Etymology

Vesuvius was a name of the volcano in frequent use by the authors of the late

• From Greek οὔ = "not" prefixed to a root from or related to the Greek word σβέννυμι = "I quench", in the sense of "unquenchable".[13]^[14]
• From Greek ἕω = "I hurl" and βίη "violence", "hurling violence", *vesbia, taking advantage of the collateral form.^[15]
• From an
  Latin or Oscan.^[16]
• From an
  Indo-European root *wes = "hearth" (compare e.g. Vesta
  )

Vesuvius is a "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.^[17] The Gran Cono was produced during the A.D. 79 eruption. For this reason, the volcano is also called Somma-Vesuvius or Somma-Vesuvio.^[18]

The caldera started forming during an eruption around 17,000–18,000 years ago^[19][20][21] and was enlarged by later paroxysmal eruptions,^[22] 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.^[23]

The cliffs forming the northern ridge of Monte Somma's caldera rim reach a maximum height of 1,132 m (3,714 ft) at Punta Nasone. The summit of the main cone of Vesuvius is 1,281 m (4,203 ft) above sea level and more than 400 m (1,300 ft) above the 5 km (3.1 mi) long valley of Atrio di Cavallo (the northern floor of Monte Somma's caldera).

The volcano's slopes are scarred by lava flows, while the rest are heavily vegetated, with scrub and forests at higher altitudes and vineyards lower down.

Formation

Vesuvius is a stratovolcano and was formed as a result of the collision of two

Mount Vesuvius has erupted many times. Numerous others preceded the eruption in AD 79 in prehistory, including at least three significantly larger; an example is 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.^[22] 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

Since 1750, seven of the eruptions of Vesuvius have had durations of more than five years; only Mount Etna has had as many long-duration eruptions in the last 270 years.^[25] The two most recent eruptions of Vesuvius (1875–1906 and 1913–1944) each lasted more than 30 years.^[25]

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.

Layers of

Scientific knowledge of the geologic history of Vesuvius comes from

• 25,000 years ago: Vesuvius started forming in the Codola Plinian eruption.^[17]
• Vesuvius was then built up by a series of lava flows, with some smaller explosive eruptions interspersed between them. By this time, the volcano was 2,000 meters (6,560 feet) tall, with the summit being 500 meters (1,640 feet) east of the current summit.^[30][31]
• About 19,000 years ago: the style of eruption changed to a sequence of large explosive and caldera-forming Plinian eruptions, of which the AD 79 one was the most recent. The calderas are aligned in a roughly east–west direction, and all contributed to forming present-day's Somma caldera.^[30] 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:^[32][30]
• 18,300 years ago: the Basal Pumice (Pomici di Base) eruption, VEI 6, the original formation of the Somma caldera. The caldera's formation was asymmetric towards the west.^[30][31] The eruption was followed by a period of much less violent, lava-producing eruptions.^[21]
• 16,000 years ago: the Green Pumice (Pomici Verdoline) eruption, VEI 5.^[17]
• 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.^[17]
• Around 5,000 years ago: two explosive eruptions smaller than the Avellino eruption.
• 3,800 years ago (19th century BC): the
  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.^[34][35] Pyroclastic surge deposits were distributed to the northwest of the vent, travelling as far as 15 km (9.3 mi) from it, and lie up to 3 m (9.8 ft) deep in the area now occupied by Naples.^[36]
• The volcano then entered a stage of more frequent, but less violent eruptions, until the most recent
  Phlegrean fields.^[30]
• The last of these may have been in 217 BC.[22] 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 Punica^[37][38] that Vesuvius had thundered and produced flames worthy of Mount Etna in that year. However, 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.^[39]

• The 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 Natural History:^[40]

• The Greek historian Strabo (c. 63 BC – c. 24 AD) described the mountain in Book V, Chapter 4 of his Geographica^[41] 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,^[42] the architect Vitruvius (c. 80–70 BC –?) reported that fires had once existed abundantly below the peak and that it had spouted fire onto the surrounding fields. He described Pompeiian pumice as having been burnt from another species of stone.

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• Diodorus Siculus (c. 90 BC – c. 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.^[43]

Eruption of AD 79

In AD 79, Vesuvius erupted in one of the most catastrophic eruptions of all time. Historians have learned about the eruption from the eyewitness account of Pliny the Younger, a Roman administrator and poet.^[44] Several dates are given in the surviving copies of the letters.^[45] The latest evidence supports earlier findings and indicates that the eruption occurred after 17 October.^[46]

The volcano ejected a cloud of

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 four days before the eruption^[49] becoming more frequent over the next four days, but the warnings were not recognized.^[b]

Scientific analysis

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. Additional light tremors accompanied these 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 reveal a multi-phase eruption.^[51] The initial major explosion produced a column of ash and pumice ranging between 15 and 30 kilometres (49,000 and 98,000 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, which interacted with magma.

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.^[52] 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 the equilibrium temperature of the pyroclastic flow.^[53] The magnetic study revealed that on the first day of the eruption a fall of white pumice containing clastic fragments of up to 3 centimetres (1.2 in) fell for several hours.^[54] It heated the roof tiles up to 140 °C (284 °F).^[55] 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 reached up to 300 °C (572 °F).^[56] Any population remaining in structural refuges could not have escaped, as gases of incinerating temperatures surrounded the city. The lowest temperatures were in rooms under collapsed roofs, at approximately 100 °C (212 °F).^[57]

The two Plinys

The only surviving eyewitness account of the event consists of two letters by Pliny the Younger to the historian

A massive black cloud glistering with lighting obscured the early-morning light, a scene Pliny describes as sheet lightning. 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 flee the shore along the road. An ash rain 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

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 to Stabiae (about 4.5 km from Pompeii).

Pliny the Elder and his party saw what they believed to be 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.^[63]

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 unaffected by the volcanic gases. It is more likely that the corpulent Pliny died from another cause, such as a stroke or heart attack.^[64] His body was found with no apparent injuries the next day, after dispersal of the plume.

Casualties

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

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.[66] The remains of about 332 bodies have been found at Herculaneum (300 in arched vaults discovered in 1980).^[67] What percentage these numbers are of the total dead or the percentage of the dead to the total number at risk remain 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,^[66] and thus were probably killed by them – probably from a combination of suffocation from inhaling ashes and blast and debris thrown around. Examination of cloth, frescoes and skeletons shows that, in contrast to the victims found at Herculaneum, it is unlikely that high temperatures were a significant cause of the destruction at Pompeii. Herculaneum, much closer to the crater, was saved from tephra falls by the wind direction but was buried under 23 metres (75 ft) of material deposited by pyroclastic surges. Likely, most 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 three persons per square metre. As only 85 metres (279 ft) of the coast have been excavated, further casualties may be discovered.

Later eruptions from the 3rd to the 19th centuries

See also:

Matthias Merian

in Danckerts Historis, 1642.

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 (760 mi.; 1,220 km).
• 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 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

USAAF during World War II

• The eruption of 5 April 1906
  comunes
  . Funds were diverted to reconstructing Naples, and a new site for the Olympics had to be found.
• Vesuvius was active from 1913 through 1944, with lava filling the crater and occasional outflows of small amounts of lava.[70]
• That 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.^[71] From 13 to 18 March 1944, activity was confined within the rim. Finally, on 18 March 1944, lava overflowed the rim. Lava flows destroyed nearby villages from 19 March through 22 March.^[72] On 24 March, an explosive eruption created an ash plume and a small pyroclastic flow.

In March 1944, the

B-25 Mitchell medium bombers. Estimates ranged from 78 to 88 aircraft destroyed.^[73]

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.^[74]

Future

Large Vesuvian eruptions which emit volcanic material in quantities of about 1 cubic kilometre (0.24 cu mi), 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 0.1 cubic kilometres (0.024 cu mi), 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. For Vesuvius, the amount of magma expelled in an eruption increases roughly linearly with the interval since the previous one, and at a rate of around 0.001 cubic kilometres (0.00024 cu mi) for each year.^[75] This gives an approximate figure of 0.08 cubic kilometres (0.019 cu mi) for an eruption after 80 years of inactivity.

Magma sitting in an underground

viscous

, adding to the explosive nature of the eruption.

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 4^[76] eruption. In this scenario, the volcano's slopes, extending out to about 7 kilometres (4.3 mi) 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 south and east of the volcano are most at risk from this. It is assumed that tephra accumulation exceeding 100 kilograms per square metre (20 lb/sq ft)—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. Near Naples, this tephra fall hazard is assumed to extend barely past the volcano's slopes to the northwest.^[75]

The specific areas affected by the ash cloud depend upon the circumstances surrounding the eruption.

The plan assumes between two weeks and 20 days notice of an eruption and foresees the

Campi Flegrei area, another volcanic complex near Naples, but no eruption occurred.^[77]

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 buildings^[77] and by offering sufficient financial incentives to people for moving away.^[78] 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.^[79]

The volcano is closely monitored by the

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. As of May 2010^[update], no magma has been detected within 10 km of the surface, so the volcano is classified by the Observatory as at a Basic or Green Level of hazard.^{[80][needs update?}

]

National park

The area around Vesuvius was officially declared a national park on 5 June 1995.^[81] 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 200 metres (660 ft) of the summit (measured vertically), but after that, access is on foot only. There is a spiral walkway around the volcano from the road to the crater.

Funicular

Mount Vesuvius' first funicular — a type of vertical transport that uses two opposing, interconnected, rail-guided passenger cars always moving in concert — opened in 1880, subsequently destroyed by the March 1944 eruption.

"Funiculì, Funiculà", a Neapolitan language song, was written to commemorate the opening of the first funicular on Mount Vesuvius.^[82]

See also

• Battle of Mount Vesuvius
• List of volcanic eruptions by death toll
• List of volcanoes in Italy
• List of stratovolcanoes

Notes

1. Latin: Vesuvius^[3] [wɛˈsʊwi.ʊs], also Vesevius, Vesvius or Vesbius.^[4]
2. ^ 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.

References

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Bibliography

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External links

Wikimedia Commons has media related to:
Vesuvio (category)

• Purcell, N.; Talbert, R.; Gillies, S.; Elliott, T.; Becker, J. (20 March 2015). "Places: 433189 (Vesuvius M.)". Pleiades. Retrieved 8 March 2012.
• Fraser, Christian (10 January 2007). "Vesuvius escape plan 'insufficient'". Naples: BBC News. Retrieved 11 May 2010.
• Garrett, Roger A.; Klenk, Hans-Peter (April 2005). "Vesuvius' next eruption". Geotimes. Archived from the original on 12 May 2007. Retrieved 8 December 2006.
• "Vesuvius: The making of a catastrophe: Il problema ignorato". Global Volcanic and Environmental Systems Simulation (GVES). 1996–2003.