EQ-lect10_6_

EQ-lect10_6_ - Earthquakes And other Natural Hazards topic...

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1 Earthquakes And other Natural Hazards 5/2/2009 topic • Volcanoes - tectonic environments and eruptions questions • What is magma? And what is lava? • What are the different types of volcanoes? • What are volcanic eruptions and their products? • Where are volcanoes?
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2 Subduction of a plate causes a volcanic arc behind the trench Volcano cross-section viscous liquid
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3 questions • What is magma? And what is lava? • What are the different types of volcanoes? • What are volcanic eruptions and their products? • Where are volcanoes? Active Volcanoes • 550 historically active, out of ~1300 active but dormant – 60% along Ring of Fire – 17% on mid-oceanic islands (Hawaii, Iceland) – 14% along Indonesian archipelago – 9% near Mediterranean, Africa, Asia Tectonic setting of volcanoes • Spreading zones (mid-ocean ridges, divergent plate boundaries) • Subduction zones (convergent plate boundaries) • Hot spots (intraplate setting) Subduction zone volcanoes Mt. Unzen
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4 Pavlov Mount St. Helens Mount St. Helens
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This note was uploaded on 05/31/2009 for the course GEL 17 taught by Professor Osleger,d during the Spring '08 term at UC Davis.

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EQ-lect10_6_ - Earthquakes And other Natural Hazards topic...

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