Volcano Mount Vesuvius :: essays research papers

Mount Vesuvius is a blowhole located in southern Italy, near the bay of Naples and the city of Naples. It is the only active volcano on the European mainland. Vesuvius rises to a height of 1277 m (4190 ft). Vesuvio (Vesuvius) is probably the around famous volcano on earth, and is one of the most dangerous.Mount Vesuvius is a strato-volcano consisting of a volcanic cone (Gran Cono) that was built within a pate caldera (Mount Somma). The Somma-Vesuvius complex has formed over the last 25,000 years by factor of a sequence of claps of variable explosiveness, ranging from the quiet lava outpourings that characterized much of the latest application (for example from 1881 to 1899 and from 1926 to 1930) to the explosive Plinian eruptions, including the one that destroyed Pompeii and killed thousands of people in 79 A.D. At least seven Plinian eruptions get to been identified inthe fiery history of Somma-Vesuvius (1). Each was preceded by a long period of stillness, which in the case of the 79 A.D. eruption lasted just about(predicate) 700 years. These eruptions were fed by treacly water-rich phonotitic to tephritic phonolitic magmas that appear to have differentiated in shallow crustal conditions. They are believed to have slowly filled a reservoir where differentiation was driven by compositional convection. A minimum depth of about 3 km was inferred for the top of the magmatic reservoir frommineral equilibria of metamorphic carbonate ejecta (2). Fluid inclusions (CO.sub.2 and H.sub.2O-CO.sub.2) in clinopyroxenes from cumulate and nodules indicate a trapping pressure of 1.0 to 2.5 kbar at about 1200 degreesC, suggesting that these minerals crystallized at depths of 4 to 10 km (3). The differentiated magma atom was about 30% of the total magma in the reservoir, and a volume of about 2 to 3 km.sup.3 wasinferred for the reservoir (4). The magma ascent to the surface occurred through a conduit of possibly 70 to 100 m in diameter (5). A thermal model predicts that such a reservoir should contain a core of partially molten magma (6) that can be detected by high-resolution seismic tomography. The earliest outcropping volcanic deposits date bear to about 25,000 years ago. The lavas observed at a -1125 m dullard are about 0,3-0,5 million years old. It is known for the first eruption of which an eyewitness account is preserved, in 79 AD. Geologically, Vesuvio is unique for its unusual versatility. Its activeness ranging from Hawaiian-style release of liquid lava, fountaining and lava lakes, over Strombolian and Vulcanian activity to violently explosive, plinian events that produce pyroclastic flows and surges.