News & updates
vendredi, mai 17, 2013
It seems that the latest cycle of increased activity has ended: after several days of intense activity, culminating in larger explosions on 14 and 15 May, the volcano has been "taking a rest" lasting about 2 days. This morning, only a small explosion was recorded. [details]
mardi, mai 14, 2013
Explosive activity has picked up again at the volcano. Today alone, several explosions have occurred, two of which of moderately large size with ash plumes reaching 10,000 and 12,000 ft (3 and 3.7 km) altitude. (VAAC Tokyo) [details]
vendredi, mai 03, 2013
Since 1 May, activity has been increasing again from relatively low levels during the weeks before. Over the past 3 days, several explosions have produced ash plumes rising to 10,000 ft (3 km) altitude and on most days, there have been 3-4 daily explosions (for Sakurajima, this is a large number). [details]
lundi, avril 29, 2013
Over the past days, the volcano has remained at comparably low levels of activity, with on average one vulcanian-type explosion of small to moderate size per day. [details]
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. ... [details]
Volcans en Japon (118 volcans)
Hokkaido (20 volcans): Oshima-Oshima | E-san | Komaga-take | Nigorigawa | Kuttara | Usu | Shikotsu | Shiribetsu | Yotei | Niseko | Shikaribetsu | Akan | Tokachi | Nipesotsu-Maruyama | Mashu | Kutcharo | Daisetsu | Rausu | Shiretoko-Iwo-zan | Rishiri
Honshu (47 volcans): Mutsu-Hiuchi-dake | Hakkoda | Iwaki | Towada | Osore-yama | Akita-Yake-yama | Hachimantai | Megata | Kanpu | Iwate | Akita-Komaga-take | Chokai | Kurikoma | Onikobe | Narugo | xxx | xxx | xxx | Adatara | Bandai | Numazawa | Nasu | Hiuchi | Niigata-Yake-yama | Takahara | Myoko | Nikko-Shirane | Omanago | Nantai | Shiga | Kusatsu-Shirane | Tate-yama | Akagi | Haruna | Washiba-Kumonotaira | Asama | Yake-dake | Oki-Dogo | Haku-san | Norikura | Kita Yatsuga-take | On-take | Mt Fuji | Hakone | Sanbe | Izu-Tobu | Abu
Kyushu (9 volcans): Tsurumi | Kuju | Aso | Unzen | Fukue-jima | Kirishima | Sumiyoshi-ike | Sakurajima | Ibusuku
Izu Islands (17 volcans): Oshima | To-shima | Nii-jima | Kozu-shima | Miyake-shima | Mikura-jima | Kurose Hole | Hachijo-jima | Aoga-shima | Myojin Knoll | Bayonnaise Rocks | Smith Rock | Tori-shima | Sofugan | Suiyo | Mokuyo | Doyo
Îles Ryūkyū (10 volcans): Kikai | Kuchinoerabu-jima | Kuchino-shima | Kogaja-jima | Nakano-shima | Suwanose-jima | Akuseki-jima | Yokoate-jima | Iwo-Tori-shima | Iriomote-jima
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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