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Hachijo-jima volcano

Updated: Jun 2, 2023 01:14 GMT -
stratovolcanoes 854 m / 2,802 ft
Izu Islands (Japan), 33.13°N / 139.77°E
Current status: normal or dormant (1 out of 5)
Last update: 9 Dec 2021

Hachijo-jima volcano (八丈島, Hachijōjima) forms an 14 km NW-SE elongated island in the central Izu Islands about 300 km south of Tokyo. It consists of 2 small overlapping, mainly basaltic stratovolcanoes (Higashi-yama and Nishi-yama).
The last eruptions were from the younger Nishi-yama volcano in the 15th century and occurred from the summit and submarine vents.

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Typical eruption style: explosive
Hachijo-jima volcano eruptions: 1707 (?), 1606, 1605, 1518-23, 1487

Latest nearby earthquakes

TimeMag. / DepthDistance/Location
Friday, May 19, 2023 GMT (1 quake)
May 19, 2023 8:25 pm (GMT +9) (May 19, 2023 11:25 GMT)
2.6

34 km
42 km (26 mi)
Philippine Sea, 251 km south of Tokyo, Japan

Background

The older of the 2 volcanoes is the eroded Pleistocene-to-Holocene Higashi-yama volcano on the SE end of the 14-km-long island.
The younger and historically active is the symmetrical Nishi-yama volcano the NW end. Flank cones occur on the SE flank of Nishi-yama. The small volcanic island of Ko-jima lies several km to the west of Hachijo-jima and probably represents a flank vent or an older predecessor volcano of Nishi-yama.
Higashi-yama began erupting several tens of thousands of years ago and formed 2 small calderas. Nishi-yama volcano started to grow from below sea level about 10,000-8,000 years ago.
(Source: Smithsonian / GVP volcano information)

2009 earthquake
A magnitude 6.6 earthquake hit 60 km SE of Hachijo-jima volcano on 13 August 2009.

2002 earthquake swarm
An earthquake swarm began at Hachijojima volcano on 13 August 2002 and lasted until around 21 August. On 15 August earthquakes occurred 2 km off the western shore at depths of 5-15 km.

See also: Sentinel hub | Landsat 8 | NASA FIRMS
Mon, 10 Jun 2013, 15:15

Hachijo-jima volcano (Izu Islands, Japan) activity update

A shallow (10 km) magnitude 4.4 earthquake occurred about 16 km to the NW of the volcano today. ... Read all
Wed, 4 Sep 2002, 06:00

Hachijojima volcano (Japan) - Smithsonian / USGS Weekly Volcanic Activity Report for 4 September-10 September 2002 (Continuing Activity)

In late August, fewer than ten earthquakes occurred at Hachijo-jima per hour and ground deformation had returned to normal levels. On 27 August, very long-period signals were detected near Hachijo-jima. The signals were felt widely on the southern coast of Honshu. ... Read all
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