1. Alexia Amann

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