mount saint helen - Mt. St. Helens 1980 The most studied...

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Mt. St. Helens 1980 The most studied eruption in history The first eruption in continental US since Lassen Peak in 1914-17 1842-57: Last eruptions prior to 1980 Major logging and recreation area The Beginning Background levels: 1975 through early 1980-only 44 earthquakes March 15-19, 1980: almost 100 earthquakes March 20, 1980: 1 st large quake beneath MSH -Magnitude 4.1 March 27 th : first steam blast, minor amounts of ash The Buildup By March 29 th two summit craters had formed March 30 th eruptions: columns up to 20,000 feet (6,000 meters) high Hazard Mitigation Attempts USGS set-up field monitoring sites -Gas measurements -Seismographs -Tiltmeters Included volcanologist David Johnston Loggers and residents resented evacuations -Roadblocks continually moved based on these pressures Harry Truman:
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Lived on Spirit Lake Refused to evacuate Became an instant celebrity The Buildup Continuing, but less frequent eruptions in April Many in public thought activity over But earthquake activity had increased
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This note was uploaded on 05/11/2008 for the course GEOL 105 taught by Professor Kohut during the Spring '08 term at University of Delaware.

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mount saint helen - Mt. St. Helens 1980 The most studied...

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