ERTH 2415 Lecture Notes - Lecture 10: Volcanic Ash, Nea Kameni, Anahim Volcanic Belt

• School: Carleton University
• Department: Earth Sciences
• Course: ERTH 2415
• Professor: Jason Mah

Document Summary

Caldera-type eruptions: tectonic environments, mostly subduction zones, hot spot, magma composition: andesitic to rhyolitic, high viscosity, high volatile content, very large volume. Caldera-type eruption: largest explosive volcanic eruptions, two different phenomena, volcanic collapse -or, cataclysmic explosion. Calderas and central vents: similarities, both are circular features associated with volcanoes, differences, central vents are created by explosions, calderas are collapse features. Caldera-type eruptions 2. cataclysmic explosion: explosion blows the existing volcano apart completely, examples: krakatoa, santorini. Krakatoa, indonesia: subduction of australian plate under eurasian plate along west coast of indonesia, reawakening 20 may 1883, had been quiet for =. 200 years: 27 august 1883: series of explosions, final cataclysmic explosion completely destroyed volcano, walls of volcano ruptured, ocean water invaded magma chamber and flashed into vapor, steam explosion, size of explosion =. In santorini, 4 - 10 times more pyroclastic material was ejected.