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Diaporama

Miyake-shima volcan éruptions

stratovolcan 815 m / 2,674 ft
Izu Islands, Japon, 34.08°N / 139.53°E
Liste des éruptions: 2010 (April-July), 2009 (April), 2008 (May), 2008 (Jan), 2006 (Aug), 2006 (Feb), 2005, 2000-04, 1983, 1962, 1940, 1874, 1835, 1811, 1763-69, 1712-14, 1709, 1643, 1595, 1535, 1469, 1154, 1085


2000 eruptions and formation of a new summit caldera
After a repose interval of 17 years, a series of new eruptions started at Miyakejima in 2000. The eruption was preceded by strong deformation and intense earthquake swarms: Between 26 June and 21 July 2000 there were 17,500 earthquakes, including 5,480 which could be felt by residents. A magnitude 6.4 earthquake on 1 July 2000 killed one person by rockfall on Kozu-shima.
An explosive eruption occurred on 7 July 2000, prompting the evacuation of the island on 1 September, and people were first allowed to return on 1 February 2005. During the period 8 July-31 August 2000, the volcano produced large phreatic eruptions, ash plumes up to 15 km high, pyroclastic flows, ash fall and a series of gradual concentric crater collapses. By October 2000, a new 1.6-km-wide summit caldera had slowly formed by subsidence and the crater floor had dropped to only 230 m above sea level.
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Source: Smithsonian / GVP monthly reports

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