Greater than 400 earthquakes have been detected beneath Washington’s Mount St. Helens in current months, although there aren’t any indicators of an imminent eruption, based on the U.S. Geological Survey.
ON THIS DAY IN HISTORY, MAY 18, 1980, MOUNT ST. HELENS ERUPTS, TRIGGERS LARGEST LANDSLIDE IN RECORDED HISTORY
A lot of the quakes over a three-month span starting in mid-July had been lower than magnitude 1.0 and too small to be felt on the floor, the company reported final week. Small magnitude earthquakes detected with delicate tools sign a volcano is “recharging” as magma flows by means of chambers and cracks deep underground, Wes Thelen, a volcano seismologist with the company’s Cascade Volcano Observatory informed The Columbian newspaper.
Mount St. Helens is photographed in Washington State, Might 18, 2020. (AP Photograph/Ted S. Warren, File)
From late August to early September, scientists noticed about 40 to 50 earthquakes per week, a quantity that has fallen to round 30 per week. Since 2008, the volcano has averaged about 11 earthquakes per 30 days.
Whereas swarms of earthquakes occurred within the late Eighties and early Nineteen Nineties, none immediately led to volcanic eruptions.
In 1980, 57 folks died when Mount St. Helens erupted, an occasion that completely altered the realm’s ecosystems. Earlier than that occasion, just one seismometer was stationed on the volcano, the company mentioned. Presently, there are at the least 20 monitoring stations.
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The newest eruption occurred from 2004 to 2008, and allowed scientists to be taught extra about how the volcano works and to develop new monitoring instruments.
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