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Lecture 9 - Harmonic tremor Seismometers are important part...

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Distribution of Active Volcanoes Around the World
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Volcanism is associated with plate tectonics
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Magma formation at subduction zones
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And many active volcanoes, too.
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Magma from melting of the mantle above the downgoing oceanic plate forms Cascade volcanoes
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Pinatubo Eruption in 1991
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basalt rhyolite/andesite/dacite Type of magma makes a big difference... Effusive/quiet versus Explosive Eruptions
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Compositions of different types of lava basalt rhyolite
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Shield volcano Stratovolcano
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Shield volcano: Mauna Loa Stratovolcano: Mount Fuji
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Earthquakes associated with volcanoes
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Unformatted text preview: Harmonic tremor Seismometers are important part of volcano monitoring Seismograph from Pinatubo Seismograph from Mt St. Helens Dangers associated with volcanoes Dangers associated with volcanoes Lahars: volcanic rock and water Volcanic Gas Lava flows Pyroclastic flows Pyroclastic flows Tephra/Ash Tephra/Ash Generation of a Tsunami Each ring represents one hour of tsunami propagation. Destruction caused by 1998 Tsunami, Papua New Guinea Brian Cassey/AP Photo Courtesy of Taro, Japan Tsunami Barrier in Taro, Japan...
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