St Helens

Mount St. Helens Age of rock < 40,000 yrs Mountain type Active stratovolcano (Subduction zone) Volcanic arc Cascade Volcanic Arc Last eruption 2004–2008 What is Mount Saint Helens eruption type? Mt. St. Helens typically generates explosive pyroclastic eruptions, in contrast to many other Cascade volcanoes, such as Mt. Rainier which typically generates relatively non-explosive eruptions …

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As a county borough, St Helens was, from 1889 to 1974, inside the administrative county of Lancashire. On 1 April 1974, under the provisions of the Local Government Act 1972, St Helens became the administrative centre of the Metropolitan Borough of St Helens in the newly created Merseyside Metropolitan county. Is St Helens in Lancashire …

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North West England. Metropolitan Borough of St Helens Borough of St Helens Region North West England Ceremonial county Merseyside Historic county Lancashire Admin HQ St Helens (Town Hall) Is St Helens in Merseyside or Lancashire? Saint Helens, urban area (from 2011 built-up area) and metropolitan borough, metropolitan county of Merseyside, historic county of Lancashire, northwestern …

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3.4 billion cubic yards. On May 18, 1980, the volcano lost an estimated 3.4 billion cubic yards (0.63 cubic mile) of its cone (about 1,300 feet or 396 meters in height), leaving behind a horseshoe-shaped crater (open to the north), with the highest part of the crater rim on the southwestern side at 8,365 feet …

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Rainhill is a village and civil parish within the Metropolitan Borough of St Helens, in Merseyside, England. Is St Helens classed as Liverpool? A county borough from 1889, in April 1974, the borough of St Helens was officially formed within Merseyside and historically, part of the area, like many others in Merseyside today, lay within …

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Mount St. Helens volcano has intermittently produced mainly dacitic products but occasionally erupted a more diverse suite of lavas including basalts and andesites. What type of rock is Mt St Helens made of? Like most other volcanoes in the Cascade Range, Mount St. Helens is a great cone of rubble consisting of lava rock interlayered …

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Mount St. Helens’ magma is inherently more explosive than the Kīlauea magma: it has more water in it than Kīlauea magma, and is delivered to the surface at a higher pressure because of higher magma viscosity. So Mount St. Helens tends to have explosive eruptions and Kīlaueaa eruptions are generally non-explosive. What causes a volcano …

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Mt St Helens is a major stratovolcano in the Cascades Range, all of which have formed as a result of the ongoing subduction of the Juan de Fuca tectonic plate beneath the western coast of North America. Prior to 1980, Mt St Helens was a classical cone-shaped volcano, and a well-visited site on the tourist …

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The eruption damaged roughly 230 square miles of land around the volcano, according to the USDA Forest Service. It destroyed 158 miles of highway, 200 homes and 15 miles or railways, the USGS reported. Washington state worked to remove about 900,000 tons of ash from highways and roads, according to the USGS. What damage did …

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magnitude 5.1 earthquake. With no immediate precursors, a magnitude 5.1 earthquake occurred at 8:32 a.m. on May 18, 1980 and was accompanied by a rapid series of events. At the same time as the earthquake, the volcano’s northern bulge and summit slid away as a huge landslide—the largest debris avalanche on Earth in recorded history. …

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