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76-553: Portici lies at the foot of Mount Vesuvius on the Bay of Naples , about 8 km (5.0 mi) southeast of Naples itself. There is a small port . To the south east is Ercolano , formerly Resina, which occupies the site of ancient Herculaneum . San Giorgio a Cremano is another town nearby. The city was completely destroyed by the Eruption of Vesuvius in 1631, but was rebuilt. Charles III of Spain , King of Naples and Sicily, built

152-589: A royal palace in the town between 1738 and 1748. After Garibaldi defeated the Bourbons in 1860, the palace was turned into the Portici botanic gardens and the Royal Higher School of Agriculture. It once contained the antiquities from Herculaneum, which have since been moved to Naples. The inhabitants were historically engaged in fishing , silk -growing and silk- weaving up to the beginning of

228-587: A changing expression, white or black". Octavius Caesar on return to Rome after the final victory of the Roman Civil War at the Battle of Actium appeared to the Senate to be a man of great power and success, clearly a mark of divinity. In recognition of the prodigy they voted that all banquets should include a libation to his genius . In concession to this sentiment he chose the name Augustus , capturing

304-726: A corporate social body is often a cameo theme on ancient coins: a denarius from Spain, 76–75 BC, featuring a bust of the GPR ( Genius Populi Romani , " Genius of the Roman People") on the obverse ; an aureus of Siscia in Croatia , 270–275 AD, featuring a standing image of the GENIUS ILLVR ( Genius Exercitus Illyriciani , " Genius of the Illyrian Army") on the reverse; an aureus of Rome, 134–138 AD, with an image of

380-494: A detailed description of the AD 79 eruption, including his uncle's death. 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 1,200 kilometres (750 mi) away. A few times since 1944, landslides in the crater have raised clouds of ash dust, raising false alarms of an eruption. Since 1750, seven of

456-528: 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 lararia , or household shrines, surviving from Pompeii . An inscription from Capua to IOVI VESVVIO indicates that he was worshipped as a power of Jupiter ; that is, Jupiter Vesuvius . The Romans regarded Mount Vesuvius as being devoted to Hercules . The historian Diodorus Siculus relates

532-533: 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

608-499: A large cone partially encircled by the steep rim of a summit caldera , resulting from the collapse of an earlier, much higher structure. The eruption of Mount Vesuvius in 79 AD destroyed the Roman cities of Pompeii , Herculaneum , Oplontis , Stabiae and other settlements. The eruption ejected a cloud of stones , ash and volcanic gases to a height of 33 km (21 mi), erupting molten rock and pulverized pumice at

684-567: A phonolitic tephrite ). According to the Smithsonian Institution 's Global Volcanism Program , Vesuvius has had 54 confirmed eruptions during the Holocene Epoch (the last 11,700 years). A volcanic explosivity index (VEI) has been assigned to all but one of these eruptions. Scientific knowledge of the geologic history of Vesuvius comes from core samples taken from a 2,000 m (6,600 ft) plus borehole on

760-531: 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." It was inhabited by giant bandits, "the sons of the Earth. With the gods' assistance, he pacified

836-585: Is a stub . You can help Misplaced Pages by expanding it . Mount Vesuvius Mount Vesuvius ( / v ɪ ˈ s uː v i ə s / viss- OO -vee-əs ) 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

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912-447: 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 . 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 17,000–18,000 years ago and

988-503: Is also reflected in Latin gignō , "give birth", and gēns , gentis , "tribe, people". The genius appears explicitly in Roman literature as early as Plautus , where one character jests that the father of another is so avaricious that he uses cheap Samian ware in sacrifices to his own genius , so as not to tempt the genius to steal it. In this passage, the genius is not identical to

1064-403: 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. The specific areas affected by the ash cloud depend upon

1140-401: 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. Vesuvius has a long historic and literary tradition. It was considered

1216-409: 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,

1292-433: The Bay of Naples . A massive black cloud glistering with lightning 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,

1368-483: The Campi Flegrei area, another volcanic complex near Naples, but no eruption occurred. Genius (mythology) In Roman religion , the genius ( Latin: [ˈɡɛnɪ.ʊs] ; pl. : genii ) is the individual instance of a general divine nature that is present in every individual person, place, or thing. Much like a guardian angel , the genius would follow each man from the hour of his birth until

1444-484: 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 in 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. Mount Vesuvius has erupted many times. Numerous others preceded

1520-535: The thermal energy released by the Hiroshima-Nagasaki bombings . The cities of Pompeii and Herculaneum were destroyed by pyroclastic surges and the ruins buried under tens of metres of tephra . 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. Some of the damage had still not been repaired when

1596-533: 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

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1672-491: 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 : 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. Several dates are given in

1748-585: The 20th century. Later a more diversified economy emerged, with industry and trade as main pillars. Vincenzo Cuomo is the mayor. In 2009, he banned shops from displaying Christmas decorations because shopkeepers were subject to extortion to buy Camorra (mob) sold decorations. In March 2008, Boeing opened a research centre for advanced materials under an agreement with the Italian aerospace company Alenia . [REDACTED] Media related to Portici at Wikimedia Commons This Campanian location article

1824-519: 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. Vesuvius is a stratovolcano and was formed as a result of the collision of two tectonic plates , the African and the Eurasian . The former

1900-486: The Bay of Naples from the volcano, approximately 35 kilometres (22 mi), 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. In a second letter, the younger Pliny details his own observations after the departure of his uncle. The two men saw an extraordinarily dense cloud rising rapidly above

1976-629: The Christian soul with the Roman genius , citing Varro as attributing the rational powers and abilities of every human being to their genius . Although the term genius might apply to any divinity whatsoever, most of the higher-level and state genii had their own well-established names. Genius applied most often to individual places or people not generally known; that is, to the smallest units of society and settlements, families and their homes. Houses, doors, gates, streets, districts, tribes, each one had its own genius . The supreme hierarchy of

2052-408: The Earth's surface, it broke through, thus forming the volcano. The volcano is one of several forming the Campanian volcanic arc . Others include Campi Flegrei , a large caldera a few kilometers to the north-west, Ischia , a volcanic island 20 kilometres (12 mi) to the west, and several undersea volcanoes to the south. The arc forms the southern end of a larger chain of volcanoes produced by

2128-459: The Roman gods, like that of the Greeks, was modelled after a human family. It featured a father, Jupiter , who was also the supreme divine unity, and a mother, Juno , queen of the gods. These supreme unities were subdivided into genii for each individual family; hence, the genius of each female, representing the female reproductive power, was a Juno . The male power was a Jupiter . The Juno

2204-451: The Roman mind to propitiate the appropriate genii for the major undertakings and events of their lives. Thus man, following the dictates of his heart, venerated something higher and more divine than he could find in his own limited individuality, and brought to "this great unknown of himself" offerings as a god; thus compensating by veneration for the indistinct knowledge of his divine origin. The Christian theologian Augustine equated

2280-493: 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. 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 chamber for many years will start to see higher melting point constituents such as olivine crystallizing out. The effect

2356-446: The circumstances surrounding the eruption. The plan assumes between two 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

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2432-412: The city. The lowest temperatures were in rooms under collapsed roofs, at approximately 100 °C (212 °F). The only surviving eyewitness account of the event consists of two letters by Pliny the Younger to the historian Tacitus . 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

2508-428: 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

2584-425: The column. The eruption alternated between Plinian and Peléan six times. Surges 3 and 4 are believed by the authors to have buried Pompeii. 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

2660-423: 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

2736-411: The crater. 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 (e.g. the eruption in 1631 displaying a complete stratigraphic and petrographic description: phonolite was firstly erupted, followed by a tephritic phonolite and finally

2812-463: The day he died. For women, it was the Juno spirit that would accompany each of them. Each individual place had a genius ( genius loci ) and so did powerful objects, such as volcanoes. The concept extended to some specifics: the genius of the theatre, of vineyards, and of festivals, which made performances successful, grapes grow, and celebrations succeed, respectively. It was extremely important in

2888-477: The early Roman Empire . Its collateral forms were Vesaevus , Vesevus , Vesbius and Vesvius . Writers in ancient Greek used Οὐεσούιον or Οὐεσούιος . Many scholars since then have offered an etymology . Given that peoples of varying ethnicity and language occupied Campania during the Roman Iron Age , the etymology depends to a large degree on the presumption of what language

2964-423: The eruption becoming more frequent over the next four days, but the warnings were not recognized. 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

3040-548: 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. The volcano erupted again in 1631, six times in

3116-415: 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. The two most recent eruptions of Vesuvius (1875–1906 and 1913–1944) each lasted more than 30 years. 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

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3192-561: 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. 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. Large Vesuvian eruptions which emit volcanic material in quantities of about 1 cubic kilometre (0.24 cu mi),

3268-440: 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. In the first letter to Tacitus, Pliny the Younger suggested that his uncle's death

3344-509: The flanks of the volcano, extending into Mesozoic rock. Cores were dated by potassium–argon and argon–argon dating . 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. The volcanic complex stands on a large, sedimentary plain. Several surviving works written over

3420-499: The following years, it again became covered with gardens and vineyards as old. Even the inside of the crater was moderately filled with shrubbery. In March 1944, 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 from multiple days of the eruption damaged

3496-490: The foreground is one or two serpents crawling toward the genius through a meadow motif. Campania and Calabria preserved an ancient practice of keeping a propitious house snake, here linked with the genius . The English term is borrowed from Latin genius , "household guardian spirit"; earlier, "innate male power of a race or clan", deriving from the Indo-European root *g̑enh₁-, "give birth, produce", which

3572-418: 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. Since the eruption of AD 79, Vesuvius has erupted around three dozen times. The volcano became quiescent at the end of the 13th century, and in

3648-406: The genius and honor" or in the case of couples, "to the genius and Juno". Surviving from the time of the empire hundreds of dedicatory, votive and sepulchral inscriptions ranging over the entire territory testify to the flourishing of official cult ( cultus ) of genius . Stock phrases were abbreviated: GPR, genio populi Romani ("to the genius of the Roman people"); GHL, genio huius loci ("to

3724-402: The genius of this place"); GDN, genio domini nostri ("to the genius of our master"), and so on. In 392 AD with the final victory of Christianity Theodosius I declared the veneration of the genii , Lares and Penates to be treason, ending their official terms. The concept, however, continued in representation and speech under different names or with accepted modifications. The genius of

3800-490: 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

3876-457: The infant would be in danger. Hundreds of lararia , or family shrines, have been discovered at Pompeii , typically off the atrium , kitchen or garden, where the smoke of burnt offerings could vent through the opening in the roof. Each lararium features a panel fresco containing the same theme: two peripheral figures ( Lares ) attend on a central figure (family genius ) or two figures ( genius and juno ) who may or may not be at an altar. In

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3952-515: 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. 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

4028-404: The military. From Gallia Cisalpina under the empire are numerous dedications to the genii of persons of authority and respect; in addition to the emperor's genius principis , were the genii of patrons of freedmen, owners of slaves, patrons of guilds, philanthropists, officials, villages, other divinities, relatives and friends. Sometimes the dedication is combined with other words, such as "to

4104-452: 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 km of magma. For Vesuvius,

4180-474: The numinous meaning of English "august". The household cult of the Genius Augusti dates from this period. It was propitiated at every meal along with the other household numina . Thus began the tradition of the Roman imperial cult , in which Romans cultivated the genius of the emperor rather than the person. If the genius of the imperator , or commander of all troops, was to be propitiated, so

4256-427: 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

4332-419: The person, as to propitiate oneself would be absurd, and yet the genius also has the avarice of the person; that is, the same character, the implication being, like person, like genius . Horace , writing when the first emperor was introducing the cult of his own genius , describes the genius as "the companion which controls the natal star; the god of human nature, in that he is mortal for each person, with

4408-459: 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 Tascius ) living on

4484-735: The pyroclastic flow. 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. It heated the roof tiles up to 140 °C (284 °F). 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). Any population remaining in structural refuges could not have escaped, as gases of incinerating temperatures surrounded

4560-414: The rate of 6 × 10 cubic metres (7.8 × 10  cu yd) per second. More than 1,000 people are thought to have died in the eruption, though the exact toll is unknown. The only surviving witness account consists of two letters by Pliny the Younger to the historian Tacitus . Vesuvius has erupted many times since. It is the only volcano on Europe's mainland to have erupted in the last hundred years. It

4636-416: 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. Vesuvius was a name of the volcano in frequent use by the authors of the late Roman Republic and

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4712-442: The scattered bones of another 100. The remains of about 332 bodies have been found at Herculaneum (300 in arched vaults discovered in 1980). 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

4788-445: 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 from inhaling ashes and blast and debris thrown around. Examination of cloth, frescoes and skeletons shows that, in contrast to

4864-478: 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

4940-414: The surviving copies of the letters. The latest evidence supports earlier findings and indicates that the eruption occurred after 17 October. The volcano ejected a cloud of stones , ashes and volcanic gases to a height of 33 km (21 mi), spewing molten rock and pulverized pumice at the rate of 6 × 10 cubic metres (7.8 × 10  cu yd) per second, ultimately releasing 100,000 times

5016-399: 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

5092-485: 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. 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

5168-407: 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. The government emergency plan for an eruption therefore assumes that

5244-429: The worst case will be an eruption of similar size and type to the 1631 VEI 4 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

5320-463: Was subducted at a convergent boundary beneath the latter, deeper into the earth. As the water-saturated sediments of the African oceanic 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

5396-399: 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. His body

5472-492: Was enlarged by later paroxysmal eruptions, 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. 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

5548-491: Was found with no apparent injuries the next day, after dispersal of the plume. 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. By 2003, around 1,044 casts made from impressions of bodies in the ash deposits had been recovered in and around Pompeii, with

5624-430: Was spoken there at the time. Naples was settled by Greeks, as the name Nea-polis , "New City", testifies. The Oscans , an 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: Vesuvius

5700-491: Was that of all the units under his command. The provincial troops expanded the idea of the genii of state; for example, from Roman Britain have been found altars to the genii of Roma , Roma aeterna , Britannia , and to every legion , cohors , ala and centuria in Britain, as well as to the praetorium of every castra and even to the vexillae . Inscriptional dedications to genius were not confined to

5776-405: Was venerated under many titles: Genii were often viewed as protective spirits, as one would propitiate them for protection. For example, to protect infants one propitiated a number of deities concerned with birth and childrearing : Cuba ("lying down to sleep"), Cunina ("of the cradle") and Rumina ("of breast-feeding"). Certainly, if those genii did not perform their proper function well,

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