Volcanic rock

World's Most Catastrophic Volcanic Eruption - Mount St. Helens Documentary - Documentary Films HD

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• published: 02 Feb 2016
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World's Most Catastrophic Volcanic Eruption - Mount St. Helens Documentary - Documentary Films HD Mount St. Helens or Louwala-Clough (called Lawetlat'la to the indigenous Cowlitz individuals, as well as Loowit to the Klickitat) is an energetic stratovolcano situated in Skamania County, Washington, in the Pacific Northwest region of the United States. It is 96 miles (154 kilometres) south of Seattle, Washington, as well as 50 miles (80 km) northeast of Portland, Oregon. Mount St. Helens takes its English name from the British mediator Lord St Helens, a close friend of traveler George Vancouver that made a study of the area in the late 18th century. [1] The volcano is located in the Waterfall Variety as well as is part of the Waterfall Volcanic Arc, a segment of the Pacific Ring of Fire that consists of over 160 active volcanoes. This volcano is well known for its ash explosions and pyroclastic flows. Mount St. Helens is most well-known for its tragic eruption on May 18, 1980, at 8:32 a.m. PDT, [2] the most dangerous and also most financially damaging volcanic occasion in the history of the United States. Fifty-seven individuals were eliminated; 250 residences, 47 links, 15 miles (24 km) of trains, and 185 miles (298 km) of freeway were ruined. A huge debris barrage set off by an earthquake measuring 5.1 on the Richter scale triggered an eruption [3] that decreased the elevation of the mountain's top from 9,677 feet (2,950 m) to 8,363 ft (2,549 m), replacing it with a 1 mile (1.6 kilometres) vast horseshoe-shaped crater. [4] The debris barrage was up to 0.7 cubic miles (2.9 km3) in volume. The Mount St. Helens National Volcanic Monument was produced to preserve the volcano and also allow for its consequences to be scientifically examined. As with a lot of various other volcanoes in the Cascade Variety, Mount St. Helens is a huge eruptive cone consisting of lava rock interlayered with ash, pumice, as well as other down payments. The hill consists of layers of lava as well as andesite whereby numerous domes of dacite lava have emerged. The biggest of the dacite domes developed the previous top, and off its northern flank sat the smaller Goat Rocks dome. Both were damaged in the 1980 eruption. Mount St. Helens is 34 miles (55 km) west of Mount Adams, in the western part of the Waterfall Range. These "sis and also sibling" volcanic mountains are approximately 50 miles (80 km) from Mount Rainier, the highest of Cascade volcanoes. Mount Hood, the nearby significant volcanic peak in Oregon, is 60 miles (100 km) southeast of Mount St. Helens. Mount St. Helens is geologically young compared with the other significant Waterfall volcanoes. It developed just within the past 40,000 years, as well as the pre-1980 summit cone started rising concerning 2,200 years earlier. [5] The volcano is thought about the most active in the Cascades within the Holocene date (the last 10,000 approximately years). Subscribe To Our Channel For More Documentary Films Videos https://www.youtube.com/channel/UCWEr2j-7WDJGZ5f8WYdRmSw?sub_confirmation=1 Or Visit Our Website: http://documentaryfilmshd.com