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Hebgen Lake Landslide

Alexia Amann. Hebgen Lake Landslide. Hebgen Lake. Manmade Retained by earth-filled dam Near Yellowstone. Cause and Damages. Earthqake August 17, 1959 – Magnitude 7.5 Destroyed trees, soil, roads The slide fell 1,000 feet into the Madison River

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Hebgen Lake Landslide

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  1. Alexia Amann Hebgen Lake Landslide

  2. Hebgen Lake • Manmade • Retained by earth-filled dam • Near Yellowstone

  3. Cause and Damages • Earthqake August 17, 1959 – Magnitude 7.5 • Destroyed trees, soil, roads • The slide fell 1,000 feet into the Madison River • Generated 30 ft waves to travel up and downstream, destroying campgrounds - 28 casualties • Created natural dam – Madison River backed up creating Earthquake Lake

  4. Fault Setting • Normal Fault • Basin and Range Tectonics • Caused major scarp displacement

  5. Surrounding Rock • Schist • Slid along plane of foliation’s weakness • Steep slope angle

  6. References • http://www.earthmagazine.org/earth/article/24c-7d9-8-12 • http://www.nvcc.edu/home/cbentley/geoblog/2008/10/madison-river-landslide-montana.html • http://libraryphoto.cr.usgs.gov/cgi-bin/search.cgi?search_mode=exact;selection=Hebgen%20Lake%20Earthquake%201959|Hebgen%20Lake|Earthquake|1959;start=0 • http://www.westyellowstonenet.com/attractions/hebgen_lake.php

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