Helens is geologically young compared with the other major Cascade volcanoes. Mount Hood, the nearest major volcanic peak in Oregon, is 60 miles (100 km) southeast of Mount St. Helens. Considered "brother and sister" mountains, the two volcanoes are approximately 50 miles (80 km) from Mount Rainier, the highest of the Cascade volcanoes. Mount St. Helens is 34 miles (55 km) west of Mount Adams, in the western part of the Cascade Range. Mount St. Helens pictured the day before the 1980 eruption, which removed much of the northern face of the mountain, leaving a large crater Geographic setting and description General Helens National Volcanic Monument was established by President Ronald Reagan and the U.S. Helens is a popular hiking spot and it is climbed year-round. Geologists predict that future eruptions will be more destructive, as the configuration of the lava domes requires more pressure to erupt. Īfter its 1980 eruption, the volcano experienced continuous volcanic activity until 2008. Six years after the eruption, most lakes in the area had returned to their normal state. By contrast, aquatic ecosystems in the area greatly benefited from the amounts of ash, allowing life to multiply rapidly. The 1980 eruption disrupted terrestrial ecosystems near the volcano. The debris avalanche was 0.6 cubic miles (2.5 km 3) in volume. A massive debris avalanche, triggered by a magnitude 5.1 earthquake, caused a lateral eruption that reduced the elevation of the mountain's summit from 9,677 ft (2,950 m) to 8,363 ft (2,549 m), leaving a 1 mile (1.6 km) wide horseshoe-shaped crater. Fifty-seven people were killed 200 homes, 47 bridges, 15 miles (24 km) of railways, and 185 miles (298 km) of highway were destroyed. The Mount St. Helens major eruption of remains the deadliest and most economically destructive volcanic event in U.S. The volcano is part of the Cascade Volcanic Arc, a segment of the Pacific Ring of Fire. Mount St. Helens takes its English name from that of the British diplomat Lord St Helens, a friend of explorer George Vancouver who surveyed the area in the late 18th century.
It lies 52 miles (83 km) northeast of Portland, Oregon, and 98 miles (158 km) south of Seattle. Mount St. Helens (known as Lawetlat'la to the indigenous Cowlitz people, and Loowit or Louwala-Clough to the Klickitat) is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States. Hike via south slope of volcano (closest area near eruption site)
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