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Alert levels lowered at Galeras and Cleveland 8 October 2009

Posted by admin in activity reports, Alaska, Cleveland, Colombia, Galeras, United States.
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Following the recent bursts of activity at Alaska’s Cleveland volcano and Galeras volcano in Colombia, things have quietened down and the alert levels for both volcanoes have been reduced by their respective observatories.

At Galeras, the INGEOMINAS Observatorio Vulcanológico y Sismológico de Pasto lowered the alert level to Yellow, ‘ Changes in the behaviour of the volcanic activity’, on 6 October. The level had already been lowered from Red to Orange on 1 October, following the eruption of 30 September.

Meanwhile, the 2 October eruption of Cleveland volcano on the Aleutian island of Chuginadak caused the Alaska Volcano Observatory to raise the alert level to Orange/Watch. There has been no eruptive activity since that brief outburst, and the AVO lowered the alert level to Yellow/Advisory on 5 October.

Information
Global Volcanism Program – Galeras – summary information for Galeras (1501-08=)
Observatorio Vulcanológico y Sismológico de Pasto – Pasto volcanological observatory main page
Global Volcanism Program: Cleveland – summary information for Cleveland (1101-24-)
AVO Cleveland Eruption Page – information on current activity at Cleveland

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Brief update on the Cleveland eruption 4 October 2009

Posted by admin in activity reports, Alaska, Cleveland, eruptions, United States.
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Mount Cleveland erupts. Picture taken by Astronaut Jeffrey N. Williams, 7 June 2006. NASA image.
Cleveland erupting in June 2006, photographed by a passing astronaut.

The Alaska Volcano Observatory have issued a further Volcanic Activity Notification for yesterday’s eruption at Cleveland volcano, giving a little more information:

Satellite data indicate that Cleveland volcano erupted briefly this morning at ~0730 UTC (2330 AKDT) 02 October 2009, producing a small, detached ash cloud that drifted northeast of the volcano at maximum altitudes of 15,000′ to 20,000′ (4.5 – 6.1 km) . AVO increased the aviation color code to Orange, and the volcano alert level to Watch at 02:29 AKDT (10:29 UTC) this morning. Satellite views until about 6:45 AKDT (14:45 UTC) show that the ash cloud drifted northeast about 600 km (373 mi) and dispersed over the Bering Sea. While no more events have been detected this morning, further eruptive activity is possible.

The volcano remains at Orange/Watch alert level status at the time of posting.

Cleveland has no real-time seismic monitoring network, so its eruptions are apt to come as a surprise. More Cleveland news here if and when it comes in…

Information
Global Volcanism Program: Cleveland – summary information for Cleveland (1101-24-)
AVO Cleveland Eruption Page – information on current activity at Cleveland
Alaska Volcano Observatory – main page for the AVO

The Volcanism Blog

Eruption at Cleveland volcano, Alaska 3 October 2009

Posted by admin in activity reports, Alaska, Cleveland, eruptions, United States.
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The Alaska Volcano Observatory increased the alert level at Cleveland volcano to Orange/Watch this morning following an eruption which produced an ash cloud to altitudes of 4.5-6.1 km. The following Volcanic Activity Notice was issued by the AVO at 02:29 AKDT (1029 UTC):

Satellite data indicate that Cleveland volcano erupted briefly this morning at ~0730 UTC (2330 AKDT) 02 October 2009, producing an ash cloud to maximum altitudes of 15,000′ to 20,000′ (4.5 – 6.1 km). Thus, the aviation color code is being increased to Orange, and the volcano alert level is being increased to Watch. Further eruptive activity is possible.

There is no real-time seismic network at Cleveland, which forms part of Chuginadak Island in the middle of the Aleutian chain, so earthquake activity cannot be tracked and eruptions can occur without warning. Cleveland is a very active volcano, with recent eruptions in 2001, 2005, 2006 and 2007, and more minor eruptive activity in 2008 and 2009.

News
Cleveland volcano on Aleutians spews ash plume – KTUU.com, 3 October 2009

Information
Global Volcanism Program: Cleveland – summary information for Cleveland (1101-24-)
AVO Cleveland Eruption Page – information on current activity at Cleveland
Alaska Volcano Observatory – main page for the AVO

The Volcanism Blog

The volcano domino effect? 13 August 2008

Posted by admin in Alaska, blogs, Cleveland, eruptions, Kasatochi, Okmok, United States.
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Three volcanoes are currently active in the Aleutian Islands: Okmok, Cleveland and Kasatochi. Chris Rowan at Highly Allocthonous ponders on this near-simultaneous eruption of three volcanoes in the same neighbourhood in an interesting post and asks. ‘Could the eruption of one have triggered the others?’ Answer: ‘no’. Disappointing news for volcanic chain-reaction catastrophists everywhere.

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