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Actualités
mardi, avril 23, 2013
The earthquake swarm that started on 17 April and included a magnitude 5.6 quake has been decreasing and remained at the same depths at around 10-15 km just west off the island. ...
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vendredi, avril 19, 2013
A strong earthquake swarm, presumably caused by a magmatic intrusion, has started Wednesday at Miyake volcano in the Japanese Izu Islands. ...
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Miyake-shima volcanstratovolcan 815 m / 2,674 ft
Izu Islands, Japon, 34.08°N / 139.53°E Condition actuelle: en vigilance - niveau agité (2 sur 5) Miyake-shima webcams / live data
Dernière mise à jour: 23 avril 2013
Style éruptif tipique: Explosive Eruptions du volcan Miyake-shima: 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 Derniers séismes proches:
The volcano has had many eruptions both from summit and flank vents, including submarine eruptions. Many eruptions have caused considerable damage to the island. Introduction:The island of Miyake-jima is the submerged part of a low-angle stratovolcano that rises about 1100 m from the sea floor. It is mainly basaltic and has small summit calderas, one which is 3.5 km wide and was formed during a major explosive eruption about 2500 years ago.There are numerous fissure vents on its flanks and flank cones, craters and maars near the coast. A 300 years long pause in activity ended in 1469. Since then, activity was mostly from flank fissures and sometimes accompanied by small summit eruptions. A new eruptive phase started in 2000, during which a new 1.6 km wide summit caldera formed by repeated subsidence of the crater. (Source: Smithsonian / GVP volcano information) 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. --- Source: Smithsonian / GVP monthly reports |
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