Mount St Helens, USA

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Mount St Helens, Washington
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Mount St Helens, an active volcano, had a famous and devastating eruption in 1982.
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Information about Mount St Helens

Mount St. Helens is an active stratovolcano in Skamania County, Washington, in the Pacific Northwest region of the United States. It is located 96 miles (154 km) south of the city of Seattle and 53 miles (85 km) northeast of Portland, Oregon. The mountain, part of the Cascade Range, takes its English name from the British diplomat Lord St Helens, who was a friend of George Vancouver, an explorer who made a survey of the area in the late 18th century. Mount St. Helens is a part of the Pacific Ring of Fire that includes over 160 active volcanoes. This volcano is well known for its ash explosions and pyroclastic flows.

Mount St. Helens is most famous for its catastrophic eruption on May 18, 1980 at 08:32 Pacific Standard Time.[1] The eruption was the most deadly and economically destructive volcanic event in the history of the United States. (In 1912, Mount Katmai, Alaska, was the site of the largest volcanic eruption in U.S. history.) Fifty-seven people were killed; 250 homes, 47 bridges, 15 miles (24 km) of railways and 185 miles (300 km) of highway were destroyed. The eruption caused a massive debris avalanche, reducing the elevation of the mountain's summit from 9,677 feet (2,950 m) to 8,364 feet (2,550 m), and replacing it with a mile-wide (1.5 km-wide) horseshoe-shaped crater.[2] The debris avalanche was up to 0.7 cubic miles (2.3 km³) in volume, making it the largest in recorded history.[2] However, the scale of the blast pales in comparison with debris avalanches that have occurred in the geological past elsewhere on Earth.

Like most other volcanoes in the Cascade Range, Mount St. Helens is a great cone of rubble consisting of lava rock interlayered with ash, pumice and other deposits. The mountain includes layers of basalt and andesite through which several domes of dacite lava have erupted. The largest of the dacite domes formed the previous summit; another formed Goat Rocks dome on the northern flank. These were destroyed in the eruption of 1980.

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