which type of volcano has explosive eruptions due to thick magma
Types of volcanic eruptions Vulcanian eruptions are a type of volcanic eruption, named after the volcano Vulcano.[20] It was named so following Giuseppe Mercalli's observations of its 1888–1890 eruptions.[21] In Vulcanian eruptions, intermediate viscous magma within the volcano make it difficult for vesiculate gases to escape. Similar to Strombolian eruptions, this leads to the buildup of high gas pressure, eventually popping the cap holding the magma down and resulting in an explosive eruption. However, unlike Strombolian eruptions, ejected lava fragments are not aerodynamic; this is due to the higher viscosity of Vulcanian magma and the greater incorporation of crystalline material broken off from the former cap. They are also more explosive than their Strombolian counterparts, with eruptive columns often reaching between 5 and 10 km (3 and 6 mi) high. Lastly, Vulcanian deposits are andesitic to dacitic rather than basaltic.[20]
Eruption of Mount Vesuvius in 79 Mount Vesuvius spewed forth a deadly cloud of tephra and gases to a height of 33 kilometres (21Â mi), ejecting molten rock, pulverized pumice and hot ash at the rate of 1.5 million tons per second, ultimately releasing 100,000 times the thermal energy of the Hiroshima-Nagasaki bombings.[2] Several Roman settlements were obliterated and buried underneath massive pyroclastic surges and ashfall deposits, the best known being Pompeii and Herculaneum.[1][2]