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Mount St. Helens вулкан

ВУЛКАН 2549 m / 8,363 ft
Вашингтон, штат (Канада и США (материк)), 46.2°N / -122.18°W
Текущее состояние: normal or dormant (1 из 5)
Last update: 10 дек 2021 (small earthquake swarm)

Mount St Helens volcano hardly needs introduction. In its spectacular eruption in 1980, it placed itself deep into collective memory, in particular within the NW states of the USA. Prior to this eruption and its gradual reawakening, little attention had been given to the volcanic nature and the beautiful mountain was a popular landmark for excursions.

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Типичный извержения стиль: ВЗРЫВООПАСНЫЕ
Mount St. Helens Вулкан-извержения: 2004-08, 1990-91, 1989-90, 1980-86 (18 May 1980: Plinian eruption), 1921(?), 1903(?), 1898(?), 1857, 1854, 1853, 1850, 1849(?), 1848, 1847, 1842-45, 1835, 1831
Lastest nearby earthquakes:
ВремяМагнитуда / ГлубинаРасстояние/Местоположение
Вторник, 17 мая 2022 GMT (2 земл.)
17 мая 2022 12:43 (GMT -7) (17 мая 2022 19:43 GMT)
1.2

1 km
44 km (27 mi)
Explosion - 13 Km ESE of Toledo, Washington
17 мая 2022 11:54 (GMT -7) (17 мая 2022 18:54 GMT)
1.6

1 km
42 km (26 mi)
Explosion - 15 Km E of Castle Rock, Washington
Понедельник, 9 мая 2022 GMT (1 земл.)
9 мая 2022 00:40 (GMT -7) (9 мая 2022 07:40 GMT)
1.3

16 km
36 km (22 mi)
21 Km E of Castle Rock, Washington
Четверг, 5 мая 2022 GMT (1 земл.)
5 мая 2022 13:06 (GMT -7) (5 мая 2022 20:06 GMT)
1.4

1 km
42 km (26 mi)
Explosion - 13 Km ENE of Kalama, Washington

Справочная информация

The eruption in 1980 followed a long repose interval, typical of the volcanoes in the Cascades Range, and is now one the best studied eruptions in history. It started with steam and ash explosions on 27 March 1980, the first eruption in the contiguous USA since the 1914-17 activity of Lassen Peak, California. Activity gradually built up, including the formation of an enormous growing bulge of the northern sector, which at the end measured more than 50 m, caused by intruding magma. The eruption culminated on 18 May when almost the entire northern sector of the mountain collapsed in a giant debris avalanche reaching 30 km. The flank collapse triggered a massive lateral blast wave that totally destroyed everything within a 10 km radius and knocked down trees as far as 30 km. Simultaneously, a vertical Plinian eruption column was erupted from the crater and reached 23 km altitude.
Despite extensive evacuation measures, several people were killed in the eruption, including volcanologist David Johnston (USGS) who was on his turn monitoring the volcano when the eruption occurred.
Prior to the 1980 eruption, Mount St. Helens formed a conical, youthful volcano sometimes called the Fuji-san of America. During the 1980 eruption the upper 400 m of the summit was removed by collapse of the slope, that left a 2 x 3.5 km horseshoe-shaped crater now partially filled by a lava dome. Mount St. Helens is a very young volcano and only about 40-50,000 years old.
It has been the most active volcano in the Cascade Range during the past 10,000 years, and the modern edifice was constructed during the last 2,200 years, when the volcano produced basaltic as well as andesitic and dacitic products from summit and flank vents. Historical eruptions in the 19th century were witnessed by early settlers.
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Sources:
USGS Cascades Volcano Observatory
St. Helens Information from the Global Volcanism Program


See also: Sentinel hub | Landsat 8 | NASA FIRMS
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