Sunday, March 29, 2009

Chaiten Volcano, Chile - John Seach

Dome growth continues at Chaiten volcano in Chile. Between 17-23 March 2009, the lava dome at Chaiten produced constant degassing and release of water vapor, and varying amounts of ash. Gravitational collapse occurred in unstable areas. Dome growth is occurring mainly in the centre, which has formed a tall, hot and unstable spine. Ash emissions have reached FutaleufĂș, SE of the volcano. There has been a significant decrease in number and magnitude of earthquakes. Earthquake measurements indicate the dome continues to grow at a lower rate, with a very localized and shallow seismicity. Chaiten volcano remains on RED alert due to ongoing dome growth, and the possibility of collapse, leading to pyroclastic flows, some of which could extend into the ChaitĂ©n River valley.
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