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Pastimes : R. Harmon's Earth 101 -- Ignore unavailable to you. Want to Upgrade?

To: long-gone who wrote (90)	4/3/2000 2:07:00 AM
From: Lilian Debray	Read Replies (1) \| Respond to 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

To: long-gone who wrote (90)	4/16/2000 12:24:00 AM
From: Lilian Debray	Read Replies (3) \| Respond to of 183

Geologists Predict Possible Tsunami at Lake Tahoe By USHA LEE MCFARLING, Times Staff Writer Study suggests two underwater faults could each generate 7.1 quakes, swamping areas near shore with 30-foot waves. But they note that perennial risk of fires and floods still poses much greater danger by comparison. "For now, people can treat it as an interesting story, but they should keep in mind if they feel a large earthquake in Lake Tahoe, they should first duck and cover and then sprint 30 feet in elevation." The closest analogy comes from a magnitude 7.5 earthquake that hit Hebgen Lake in Yellowstone National Park on Aug. 17, 1959. latimes.com

To: long-gone who wrote (90)	5/5/2000 10:16:00 PM
From: Lilian Debray	Read Replies (1) \| Respond to of 183

"World's tallest geyser erupts Steamboat was said to be emitting a tremendous roar and to have pushed a vapour plume 150 metres (500 feet) into the air. Experts say that Steamboat Geyser rarely erupts this dramatically. More commonly, it ejects water in frequent bursts of 3-12 metres (10-40 feet) in height. Most major eruptions will go over 90 metres (300 feet), showering viewers with mineral-rich waters. But this is an extremely rare event. Steamboat was dormant from 1911-1961. In recent years, it has erupted in 1989 (3 times), 1990 (1 time), and 1991 (1 time). There are hundreds of geysers at Yellowstone, more than in any other part of the world. The most famous is Old Faithful which throws up a column more than 30-metres (100-feet) high every hour or so." news.bbc.co.uk