01:460:100 Lecture Notes - Lecture 6: Mount Mazama, Magma Chamber, Crater Lake

• School: Rutgers University
• Department: Geological Sciences
• Course: 01:460:100
• Professor: Sugarman

Document Summary

Deformation: rising magma and increased gas pressure cause volcanoes to swell before eruption, and collapse after eruption. Crater: steep walled circular depression located at summit of many volcanoes, formed by extrusion of magma and subsequent collapse. Calderas: large, circular depression formed when magma chamber erupts their content and volcano collapses into empty magma chamber. regions with water. Large calderas: caldera forming eruptions can expel 10k of ash that blankets whole. Crater lake formed from the collapse of mount mazama, forming a caldera that filled: yellowstone caldera eruptions, 2. 0 m years ago, 1. 2 m years ago, 0. 64 m years ago. Geysers and hot springs found in young volcanic areas surface water percolates downward to high temp. regions surrounding magma reservoir. Water is heated, becomes less dense and rises back to surface along cracks. Vei: volcanic explosivity index: relative scale from 0-8, ranked according to, volume of material ejected, height of cloud, duration of eruption, style of eruption.