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Pastimes : R. Harmon's Earth 101
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To: long-gone who wrote (90)4/3/2000 2:07:00 AM
From: Lilian Debray  Read Replies (1) of 183
 
seismo.ethz.ch

Mt. Rainier, Washington State This composite volcano has erupted numerous times; most recently 150 years ago. Mt. Rainier is located near Seattle. The rim of the volcano is littered with fumaroles which vent volcanic gases. This volcano could erupt explosively like its sister, Mt. St. Helens. However, what might be more dangerous is the possibility of deadly Lahars (hot mudflows) which can occur with little warning. Seattle has numerous Lahar deposits located within its suburbs. A deadly Lahar came down the slopes of Nevado del Ruiz buried the town of Amero, Columbia killing 23,000 people.

Mt. St. Helens, 1980 On Sunday, May 18th, this strato (composite) volcano erupted explosively removing half the volcano and spewing 540 million tons of ash into the atmosphere as high as 60,000 feet. The direct blast leveled trees 400 square kilometers in areal extent. 62 people died. Total economic loss is placed at $1.2 billion.

Yellowstone This rhyolitic dome has formed several calderas documenting the past three eruptions. The Yellowstone dome has erupted gas flow deposits and rhyolite magma 1.9 , 1.3, and 0.6 million years ago (recurrence interval of 0.6 million years....we are due for an eruption here in the near future). This is the site of 80% of the worlds known geysers.

geo.umn.edu
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