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Miyake-shima volcano

Updated: Dec 3, 2022 05:18 GMT -
stratovolcano 815 m / 2,674 ft
Izu Islands (Japan), 34.08°N / 139.53°E
Current status: normal or dormant (1 out of 5)
Last update: 8 Dec 2021

Miyake-jima (三宅島 Miyakejima) is an active stratovolcano in the northern Izu Islands, about 200 km south of Tokyo. It forms a 8 km diameter circular island and is one of the most frequently active volcanoes in the island chain. It typically erupts every 10-30 years. The last series of eruptions started in June 2000 after 17 years of repose.
The volcano has had many eruptions both from summit and flank vents, including submarine eruptions. Many eruptions have caused considerable damage to the island.

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Typical eruption style: explosive
Miyake-shima volcano eruptions: 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

Latest nearby earthquakes

TimeMag. / DepthDistance/Location
Thursday, November 24, 2022 GMT (1 quake)
Nov 24, 2022 7:54 pm (GMT +9) (Nov 24, 2022 10:54 GMT)
3.1

123 km
33 km (21 mi)
Philippine Sea, 211 km south of Tokyo, Japan
Wednesday, November 23, 2022 GMT (1 quake)
Nov 23, 2022 4:33 pm (GMT +9) (Nov 23, 2022 07:33 GMT)
2.6

111 km
28 km (17 mi)
North Pacific Ocean, 96 km southeast of Itō, Prefectura de Shizuoka, Japan

Background

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.
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Source: Smithsonian / GVP monthly reports

See also: Sentinel hub | Landsat 8 | NASA FIRMS
Tue, 23 Apr 2013, 10:38

Miyake-shima volcano (Izu Islands, Japan) activity update

Depth vs time of the recent earthquakes west of Miyake island
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. Read all
Fri, 19 Apr 2013, 04:46

Miyake volcano (Izu Islands, Japan): earthquake swarm

Map of recent quakes near Miyake-Shimy volcano
A strong earthquake swarm, presumably caused by a magmatic intrusion, has started Wednesday at Miyake volcano in the Japanese Izu Islands. ... Read all
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