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vendredi, sept. 14, 2012
An M 2.4 earthquake occurred beneath the summit of Mount Rainier at 08:45 PDT, September 13, and was followed by a dozen or so aftershocks over the next ~20 minutes. ...
[details]
Mount Rainier volcanstratovolcan 4329 m / 14,409 ft
Washington, USA, 46.85°N / -121.76°W Condition actuelle: en sommeil (1 sur 5) Mount Rainier webcams / live data
Dernière mise à jour: 14 sept. 2012 (M 2.4 shallow earthquake beneath the north rim of East Crater on 13 Sep)
Style éruptif tipique: Explosive Eruptions du volcan Mount Rainier: 1894, 1882(?), 1879(?), 1870(?), 1858(?), 1854(?), 1843(?), 1825(?), 300 BC, 520±200 BC, 3400 BC, 3600 BC, 3650 BC, 4400 BC, 4900 BC, 5300 BC, 5400 BC, 6800 BC Derniers séismes proches:
Reported 19th-century eruptions can not be verified by any deposits, but it is likely that some phreatic activity took place in 1894. Previous eruptions have produced large debris avalanches and lahars, some of which have traveled all the way to the Pacific Ocean and reached Puget Sound. Introduction:Mount Rainier is a typical andesitic stratovolcano. It has produced large lahars and debris avalanches. Its present summit was built within a large crater breached to the northeast formed by collapse of the volcano during a major explosive eruption about 5600 years ago, that produced the widespread Osceola Mudflow.Mt Rainier's eruptive history has been studied in detail. It includes about a dozen major eruptions during the past 2600 years, the largest of which occurred about 2200 years ago. The present-day summit cone is cut by two overlapping craters. Extensive hydrothermal activity is present in the summit craters. It has produced melting of glacial ice created a complex system of steam caves found in the summit icecap. |
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