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Bajo los cerezos en flor

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Unemployment in the immediate region of Mount St. Helens rose 10-fold in the weeks immediately following the eruption, and then returned to near-normal levels once timber-salvaging and ash-cleanup operations were underway. Scientists with the U.S. Geological Survey and University of Washington’s Pacific Northwest Seismograph Network maintain constant watch for signs of renewed activity at Mount St. Helens and other Cascade volcanoes. Recall from above that surface deformation followed a similar pattern: A small amount of dilatation occurred sometime during 1982–1991 (presumably after the 1980–1986 eruption ended), but thereafter the area was stable for more than a decade leading up to the 2004–2008 eruption. Has the reservoir been replenished since the eruption ended, and is it now primed for the next eruption? What additional precursors, if any, should be expected? This paper addresses these questions, explores possible answers, and identifies unresolved issues in need of additional study. The Mount St. Helens volcano reawakened in March 1980 after more than a century of quiet. A magnitude 4.0 earthquake on March 20 was followed by two months of intense earthquake activity, and phreatic «steam-blast» eruptions which began on March 27. After the ashes Scientists knew Mount St. Helens would come back to life after the 1980 eruption, but as a new book shows, its resilience still blew them away. By Eric Wagner | March 2020 Deposits of ash and pumice ranged from more than three feet (100 cm) deep near the volcano to traces of ash 500 miles (800 km) to the east. A massive ash column 15 miles high rose from the crater. The ash covered nearby forests, retarding tree growth during the first year after the eruption. Mount St. Helens, a volcano that belongs to the Pacific “Ring of Fire,” had known its fair share of eruptions. The mountain experienced at least nine significant eruptions before May 1980, but the last had been in 1857 — 123 years earlier. Magma began intruding into the Mount St. Helens edifice in the late winter and early spring of 1980. By May 18, the cryptodome (bulge) on the north flank had likely reached the point of instability, and was creeping more rapidly toward failure. Mount St. Helens seized the world’s attention in 1980 when the largest historical landslide on Earth and a powerful explosive eruption reshaped the volcano, created its distinctive crater, and dramatically modified the surrounding landscape.