EARTHSC 2GG3 Lecture Notes - Lecture 5: Lateral Eruption
19 Jan 2019
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Document Summary
Lahars- large amounts of loose volcanic ash and other pyroclastic material become saturated with water and rapidly move downslope. St. helens: prior to erupting in 1980, it was dormant for 120 years. In march, 1980- a bulge began to grow on the northern flank of the mountain at rate of. 1. 5 m per day: may 18, 1890, 8:32- a. m 5. 1 earthquake triggers a landslide/debris avalanche of the bulge area, seconds later, a lateral blast from the bulge area occurred at rate of 480 km/h. St. helens after the eruption flooding destroyed over 100 homes forests to the north of the mountain were flattened: 57 ppl were killed, damage exceeded us billion, september 23, 2004 mt. St. helens reawakened: magma began moving toward the crater floor, the mountain is monitored with seismographs to continuously record events.
