GEOG 1350 Study Guide - Midterm Guide: Basalt, Seismic Wave, Destructive Testing
1 Jun 2016
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Document Summary
Erupted in 1980 after 120 years of dormancy explosive volcanic eruption. Bulge develops on north flank of mountain earthquake triggered a debris avalanche causing the bulge to break away. A lateral blast exploded from the location of the former bulge, moving more than 480km/h and levelling timber over an area of 600km2. Pyroclastic flows swept down the north slope of the volcano. Ash and gas reached an altitude of 19km and the eruption continued for 9 hours; ash fell over. Washington, northern idaho, western and central montana, and southwest canada; the ash circled the earth in less than three weeks. The eruption transformed the landscape into a barren land covered in ash, rocks, melting glacier ice, narrow gullies, and steaming pits. Lahars began minutes after the eruption began and threatening the lives of people camping along the toutle river; the lahars moved at speeds of 29-55 km/h.
