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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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