Mappa topografica Mount Saint Helens
Mappa interattiva
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A proposito di questa mappa
Nome: Mappa topografica Mount Saint Helens, altitudine, rilievo.
Altitudine media: 2.096 m
Altitudine minima: 1.540 m
Altitudine massima: 2.533 m
The Mount St. Helens major eruption of May 18, 1980 remains the deadliest and most economically destructive volcanic event in U.S. history. Fifty-seven people were killed; 200 homes, 47 bridges, 15 miles (24 km) of railways, and 185 miles (298 km) of highway were destroyed. 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. The debris avalanche was 0.6 cubic miles (2.5 km3) in volume. The 1980 eruption disrupted terrestrial ecosystems near the volcano. By contrast, aquatic ecosystems in the area greatly benefited from the amounts of ash, allowing life to multiply rapidly. Six years after the eruption, most lakes in the area had returned to their normal state.
Altre mappe topografiche
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United States > Washington > Skamania County > North Bonneville
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United States > Washington > Skamania County
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United States > Washington > Skamania County > Carson
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United States > Washington > Skamania County
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United States > Washington > Skamania County
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United States > Washington > Skamania County
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