Ian
priscilla 1The Eruption of Mt St. Helens
June 4th 2010 03:41
Mount St. Helens is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States. It is 96 miles (154 km) south of Seattle and 50 miles (80 km) northeast of Portland, Oregon.
Mount St. Helens is most famous for its catastrophic eruption on May 18, 1980, at 8:32 am PDT which was the deadliest and most economically destructive volcanic event in the history of the United States. Fifty-seven people were killed; 250 homes, 47 bridges, 15 miles (24 km) of railways, and 185 miles (298 km) of highway were destroyed. The eruption caused a massive debris avalanche, reducing the elevation of the mountain's summit from 9,677 ft (2,950 m) to 8,365 ft (2,550 m) and replacing it with a 1 mile (1.6 km) wide horseshoe-shaped crater. The debris avalanche was up to 0.7 cubic miles (2.9 km3) in volume. The Mount St. Helens National Volcanic Monument was created to preserve the volcano and allow for its aftermath to be scientifically studied.
Images below sourced from this article at Boston.com.
*This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia page for Mount St. Helens.
Mount St. Helens is most famous for its catastrophic eruption on May 18, 1980, at 8:32 am PDT which was the deadliest and most economically destructive volcanic event in the history of the United States. Fifty-seven people were killed; 250 homes, 47 bridges, 15 miles (24 km) of railways, and 185 miles (298 km) of highway were destroyed. The eruption caused a massive debris avalanche, reducing the elevation of the mountain's summit from 9,677 ft (2,950 m) to 8,365 ft (2,550 m) and replacing it with a 1 mile (1.6 km) wide horseshoe-shaped crater. The debris avalanche was up to 0.7 cubic miles (2.9 km3) in volume. The Mount St. Helens National Volcanic Monument was created to preserve the volcano and allow for its aftermath to be scientifically studied.
Images below sourced from this article at Boston.com.
Mount St. Helens on the day before the eruption, May 17, 1980, as viewed from what came to be known as Johnston Ridge, about six miles from the volcano.
Mount St. Helens in eruption on May 18, 1980 showing the violence of the eruption in contrast with the apparently quiet countryside, Mount Adams in background, right.
Bob Brown (right), John Brown and two other unidentified people are shown May 19, 1980 climbing onto a railroad car and heading down the train. The would-be horse rescuers gave up their efforts as they fled for their lives as flood waters from the Toutle River begin a sudden rise. All four people reached safety but the horses were presumed to have drowned.
An aerial view of blowdown and Fawn Lake, inside the blast zone on October 28, 1980 (note Mount St. Helens in the background). Note also the USGS scientists in a small boat in the middle of the lake taking water samples.
A mudflow deposit covers Washington State Highway 504 near the town of Toutle, northwest of Mount St. Helens, to a depth of 2m (6 ft).
wrecked logging truck and crawler tractor are shown amidst ash and downed trees near Mount St. Helens on May 20, 1980, two days after the explosive eruption.
3,000 ft (1 km) steam plume on May 19, 1982, two years after its major eruption.
*This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia page for Mount St. Helens.
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