Sunset amphitheater source of the electron lahar old

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Sunset Amphitheater: source of the Electron lahar Old-growth forest buried by lahar 500 years ago (excavated during construction) Lahar: The Electron Flow
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Cold Debris Avalanche: Mt Rainier Hydrothermal Alteration causing unstable flanks
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Mt. Rainier Cross-Sections
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Volcano of the Day #1 Mt. UNZEN Japan ( ) and now, back to
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Unzen Volcano. 1991 pyroclastic flows; also, 1792 debris avalanche from Mayuyama, on the right of photo. City of Shimabara is built among hummocks of the debris avalanche Debris avalanche into the bay generated tsunami that killed ~15,000.
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Map showing lateral extent (including submarine) of the 1792 debris avalanche from Unzen. Magma intrusion and lava flow that triggered the landslide are at far left, on Fugen-dake.
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1792 Tsunami, Unzen
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Japanese graphic of the 1792 landslide. Note water gushing out from springs, just before the landslide occurred. Magma intrusion at Fugen-dake, few km away, compressed the ground, pumped up pore pressures and, together w/ earthquakes from the intrusion, triggered the giant landslide.
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Collapses aren t limited to steep-sided stratovolcanoes. Oceanic shield volcanoes collapse too! •Hawaii –Most of the islands are missing parts; deposits are on the sea floor •Reunion --same •Canary Islands, Azores --same
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Hawaii
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East Molokai Oahu Wailau Slide Nuuanu Slide
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Lanai West Molokai East Molokai
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Kalaupapa peninsula
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Moral of today’s story: Volcanoes are build up, Volcanoes fall down
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Stratovolcanoes/ “Composite” Volcanoes
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  • Spring '09
  • Bergantz
  • Volcanoes, Volcano, Mt Rainier, Pyroclastic flow, debris avalanche, Unzen volcano, Hummocky Topography

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