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Usu

Home: Asia: Japan: Usu

Usu

Statistics:
Location: 42.53°N, 140.83°E (Hokkaido, Japan)
Summit elevation: around 3,315 m.a.sea-level
Last eruption: active since several thousand years. Last big eruption in 2001
Type: Stratovolcano

Abstract:
Usu is a small stratovolcano located astride the southern topographic rim of the 110,000-year-old Toya caldera. The center of the 10-km-wide, lake-filled caldera contains Naka-jima, a group of forested andesitic lava domes. The summit of the dominantly basaltic edifice of Usu is cut by a somma formed about 7-8,000 years ago when collapse of the volcano produced a debris avalanche that reached the sea. Dacitic domes erupted along two NW-SE-trending lines fill and flank the summit caldera. Three of these domes, O-Usu, Ko- Usu and Showa-Shinzan, along with seven crypto-domes, were erupted during historical time. The 1663 eruption of Usu was one of the largest in Hokkaido during historical time. The war-time growth of Showa- Shinzan from 1943-45 was painstakingly documented by the local postmaster, who created the first detailed record of growth of a lava dome.
(From the Global Volcanism Program)

Latest Earthquakes in this region (last updated: 04. January 2006:17:29 MET):

From Swiss Seismological Service:

D a t e Time (UTC) Location Dep Magni. Region

03Jan2006 12:26:16.4 42.6N 142.3E132 mb=5.1 AEMS HOKKAIDO, JAPAN REGION 1333
03Jan2006 12:26:14.7 42.4N 142.2E130 mb=4.9 MGSR HOKKAIDO, JAPAN REGION 1320
28Dec2005 15:42:06.1 44.0N 145.1E150 mb=4.8 MGSR HOKKAIDO, JAPAN REGION 2001
21Dec2005 20:47:00.7 43.6N 143.7E150 mb=5.0 MGSR HOKKAIDO, JAPAN REGION 2219
20Dec2005 22:58:35.6 41.8N 140.6E 33 mb=4.9 A*EMS HOKKAIDO, JAPAN REGION 0037

Only events with an average magnitude larger/equal than 3 are listed.
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Other source: NEIC

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Last modification: 03.02.2006