Lecture 12 - olcanic Hazards in the US Subduction of the...

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Unformatted text preview: olcanic Hazards in the US Subduction of the oceanic lithosphere below Oregon and ashington are responsible for the volcanic activity. Mt St Helens (pre-eruption) http://vulcan.wr.usgs.gov/Imgs/Jpg/MSH/Images/MSH80_bulge_on_north_side_04-27-80_med.jpg April 27, 1980 The bulge Copyrighted photographs of Gary Rosenquist 1980 0 secs 5 secs 16 secs 31 secs Ash plume from Mt St Helens eruption (looking north) http://vulcan.wr.usgs.gov/Imgs/Jpg/MSH/Images/MSH82_st_helens_plume_from_harrys_ridge_05-19-82_med.jpg May 1982, two years after main eruption; small dome is developing inside crater. (looking south) The devastation occurred 10s of miles from the volcano summit! Although ash from the eruption fell 600 km from the volcano, the 1980 eruption was relative to other eruptions from the Cascade Range. Mt St Helens ash fall http://vulcan.wr.usgs.gov/Imgs/Gif/ MSH/Maps/may18_ashmap.gif Mt St Helens Mt Rainier http://vulcan.wr.usgs.gov/Imgs/Jpg/MSH/MSH04/MSH0 4_aerial_mount_st_helens_and_mount_rainier_12-11- 04_med.jpg http://www.city-data.com/city/Orting-Washington.html http://www.daffodilvalleytimes.com/community/images/orting_sign.jpg Mt. Rainier from Orting, WA http://vulcan.wr.usgs.gov/Imgs/Jpg/Rainier/Images/Rainier95 _mount_rainier_and_orting_washington_02-08-95_med.jpg Would you choose to live in Orting now that you know it is located near an active volcano? A) Yes B) No Population in 2000: ~3,760 Population in 2006: ~5,462 http://pics.city-data.com/agegraph/23859.png school...
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Lecture 12 - olcanic Hazards in the US Subduction of the...

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