What is happening at Gareloi? 28 March 2009Posted by admin in activity reports, Alaska, Gareloi, United States.
Tags: Alaska, Gareloi, United States, volcanic activity reports
[UPDATE: It seems that ‘what is happening at Gareloi’ is that it is blowing a gale. The trace below appears to be a particularly dramatic example of what a good strong blow looks like on a seismograph. Further update, this has been confirmed by AVO. Additional update, AVO have added a note to the Gareloi webicorder page explaining that their equipment is being affected by wind. To stop people getting over-excited about eruptions that aren’t happening.]
Gareloi is a remote volcano in the Delarof Islands, at the far western end of the Aleutian Islands chain. Its recent history has seen fairly frequent eruptions, the most recent eruption (disregarding an unconfirmed event in 1996) being in August 1989. Monitoring there consists of a single seismometer, which is readable through a webicorder trace on the AVO website. Here is a screenshot of the current trace:
That looks like an eruption, and a sizeable, sustained one at that. Increasing seismicity – tremor interspersed with discrete quakes – from around 23:00-00:00 GMT on 27 March, rising to saturate the graph from around 04:00-04:30 GMT today, and still ongoing.
The status of this volcano remains Green at the moment, there are no volcanic ash advisories from Anchorage or Tokyo, and there is no word on this activity from the AVO.