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Italy’s Mt. Vesuvius

This is an outline of the different aspects of this specific Volcano

Krysti Clarke

on 22 March 2011

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Transcript of Italy’s Mt. Vesuvius

One of the earilest of the deadly volcanoes, Mt. Vesuvius, erupted in 79 AD, utterly destroying the cities of Pompell and Herculaneum. All eruptions since that time have been notably less severe; however, Mt. Vesuvius is considered to be one of the most dangerous volcanoes one arth because of the high populations in the immediate vicinity 1. Eruption History 2. Eruption Style 3. Rock type 5. Geologic Hazards Most rocks erupted from Vesuvius are andesite, an intermediate volcanic rock (about 53-63% silica). Andesite is a fine-grained, extrusive igneous rock composed mainly of plagioclase with other minerals such as hornblende, pyroxene and biotite. Mount Vesuvius is a large stratovolcano. It has a hunchback shape and a very large cone that is encircled partially by the caldera. This gives it a symmetrical shape. The caldera has a very steep summit. This resulted from the collapse of the older and higer structure, Monte Summa. In other words, the volcano has a summit caldera surrounded by a newer one. Mount Vesuvius 4. The Volcano's Shape Explained Vesuvius had high silica content during the first two eruptions and lower silica content during the last two eruption styles. There are 4 Different Types of Eruptions

1. Plinian Eruption. 79 AD Eruption. This includes extremely large eruptions creating large explosive clouds in large vertical columns. This happens very quickly and can create pyroclastic flows and lahars

2. Sub plinian Eruption. 1631 eruption. Smaller than plinian eruptions but still creating pyroclastic flows and large ash plumes.

3. Strombolian Eruptions. 1631 - 1944. This creates tephra flows locally around the mountain and large lava flows.

4. Hawaiian style Eruptions. 1631 - 1944. Mostly lava flows in the crater and it is normally just a flow of lava. Geologic hazard is a natural geologic event that can endanger human lives and threaten human property. Earthquakes, geomagnetic storms, landslides, sinkholes, tsunamis, and volcanoes are all types of geologic hazards.
Italy’s Mt. Vesuvius is currently quiet, with only minor seismic (earthquake) activity and outgassing from fumaroles in its summit crater, but more violent activity could resume in the future.
Fumarole: A vent that emits hot gases, usually associated with past or current magmatic activity below. Lava flows can cause significant damage to infrastructure, and are a more significant hazard today than in the past because of encroaching development on the sides of Somma-Vesuvius. They are rarely a threat to human life due to their slow speed. Lava flows are common at Vesuvius during strombolian- and vulcanian-type eruptions.
79 AD: Most Famous and Destructive Eruption
203 AD: Violent Eruption
472 and 512 AD: Large Eruptions that "Covered Europe with Lots of Ash”
Small Eruptions in 685, 787, 968
1037 and 1139: Strong and Explosive Eruptions
1631: Most Destructive Since 512, had Earthquakes Several Months Before
1794, 1822, 1834, and 1850: Major eruptions
1929: Major Lava Flow
March 1944: Most Recent Eruption Today's population around
Mt. Vesuvius is about 3 million Dacite Trachyte Latite
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