We are currently having technical problems with the volcano profiles, Weekly Reports, and Current Eruptions pages, but expect to have them restored on 24 May. Sorry for the inconvenience.
Logo link to homepage

Report on Suwanosejima (Japan) — 17 November-23 November 2010


Suwanosejima

Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 17 November-23 November 2010
Managing Editor: Sally Sennert.

Please cite this report as:

Global Volcanism Program, 2010. Report on Suwanosejima (Japan) (Sennert, S, ed.). Weekly Volcanic Activity Report, 17 November-23 November 2010. Smithsonian Institution and US Geological Survey.

Weekly Report (17 November-23 November 2010)

Suwanosejima

Japan

29.638°N, 129.714°E; summit elev. 796 m

All times are local (unless otherwise noted)


Based on information from JMA, the Tokyo VAAC reported explosions from Suwanose-jima during 18-23 November. Plumes rose to an altitude of 1.8 km (6,000 ft) on 18 November and to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted NE on 21 November.

Geological Summary. The 8-km-long island of Suwanosejima in the northern Ryukyu Islands consists of an andesitic stratovolcano with two active summit craters. The summit is truncated by a large breached crater extending to the sea on the E flank that was formed by edifice collapse. One of Japan's most frequently active volcanoes, it was in a state of intermittent Strombolian activity from Otake, the NE summit crater, between 1949 and 1996, after which periods of inactivity lengthened. The largest recorded eruption took place in 1813-14, when thick scoria deposits covered residential areas, and the SW crater produced two lava flows that reached the western coast. At the end of the eruption the summit of Otake collapsed, forming a large debris avalanche and creating an open collapse scarp extending to the eastern coast. The island remained uninhabited for about 70 years after the 1813-1814 eruption. Lava flows reached the eastern coast of the island in 1884. Only about 50 people live on the island.

Source: Tokyo Volcanic Ash Advisory Center (VAAC)