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Landsat 8 infrared image of Nishinoshima on 21 June 2015 showing the active areas (vent and lava delta)
Tuesday, Jun 23, 2015
The eruption on the island continues with apparently relatively steady lava effusion that feeds active flows reaching and enlarging the SE corner of the island, which has now 2.7 square kilometer of surface. ... [more]
Monday, Jun 22, 2015
The volcano remains highly active, producing regularly 5-10 or even more vulanian-type explosions on a daily basis. A few hours ago, JMA recorded the 650th this year alone. [more]
Steam and ash plume from Asama volcano
Weak activity continues from the volcano's summit crater. Small ash emissions, intense degassing as well as weak incandescence from the volcano's crater have been observed during the past days. [more]
Friday, Jun 19, 2015
Another eruption occurred from the Shindake crater shortly after noon on 18 June. It was not directly observed due to cloud cover and the island being evacuated, but sent out a clear explosion signal picked up on seismic stations. ... [more]
Tuesday, Jun 16, 2015
A small eruption occurred at the volcano this morning around 9am local time. ... [more]
Map of volcanoes in Japan (USGS)
Map of volcanoes in Japan (USGS)

Volcanoes of Japan (118 volcanoes)

Japan has over 100 active volcanoes, more than almost any other country and accounts alone for about 10 % of all active volcanoes in the world. The volcanoes belong to the Pacific Ring of Fire, caused by subduction zones of the Pacific plate beneath continental and other oceanic plates along its margins.
Japan's volcanic arcs and tectonic setting
Japan is located at the junction of 4 tectonic plates - the Pacific, Philippine, Eurasian and North American plates, and its volcanoes are mainly located on 5 subduction-zone related volcanic arcs where the Pacific Plate descends under the North American Plate along the Kuril Trench and the Japan Trench and underneath the Philippine Sea Plate along the Izu-Bonin Trench. The Philippine Plate itself subducts beneath the Eurasian Plate at the western end, forming the Ryukyu Trench. The principal resulting volcanic ars are:
- Ryukyu Arc and Southwest Honshu Arcs in the south (Philippine plate subducting beneath between the Eurasian Plate),
- Izu-Bonin-Mariana Arc (subduction of Pacific plate beneath Philippine plate)
- Northeast Honshu and Kurile Arc in the north (subduction of Pacific plate beneath the N-American plate)
(more info: www.glgarcs.net/intro/subduction.html)

Besides intense volcanic activity, Japan is one of the places in the world most affected by frequent, and sometimes devastatingly large earthquakes. Its oceanic setting makes it vulnerable for tsunamis as well, as the tragedy of the 11 March 2011 8.9 earthquake and tsunami terrifyingly illustrated.

Record in historically documented eruptions
Japan's first documented historical eruption was from Aso volcano in 553 AD , the year after Buddhism was introduced from Korea. It holds a record in the number of historically documented eruptions.
Japan's largest historical eruption (Towada, 915 AD), 17 Japanese volcanoes had been documented in eruption, more than the rest of the world combined (including 10 in Europe).

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