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Alert level lowered at Okmok 21 March 2009

Posted by admin in activity reports, Alaska, Okmok, United States.
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At the beginning of March the Alaska Volcano Observatory raised the alert level at Okmok to Volcanic Alert level Advisory and Aviation Colour Code Yellow following an increase in seismic activity, including bursts of volcanic tremor. Since then activity levels have fallen and remained low, and yesterday came news that the AVO has lowered alert levels once again to the non-eruptive state of Volcanic Alert Level Normal and Aviation Colour Alert Green.

News
Geologists lower Okmok Volcano warning level – KTUU.com, 20 March 2009

Information
Global Volcanism Program: Okmok – summary information for Okmok (1101-29-)
Alaska Volcano Observatory Okmok eruption page – Okmok information and updates from the AVO

The Volcanism Blog

Alert levels raised at Okmok 3 March 2009

Posted by admin in activity reports, Alaska, Okmok, United States.
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The Alaska Volcano Observatory raised the Aviation Colour Code to Yellow and the Volcanic Alert Level to Advisory overnight for Okmok, the Aleutian volcano that erupted last summer. This is in response to the appearance of short bursts of volcanic tremor, which have been occurring at the rate of about one per over the past 24 hours. ‘This is the first sign significant seismic activity at the volcano since the cessation of eruption in August 2008’, notes the most recent AVO bulletin on Okmok, ‘and represents an increase above typical background activity’ (2009-03-02 21:05:29).

Yellow is the second-lowest level of the Aviation Colour Code system, and Advisory is the second-lowest level of the Volcano Alert Level system. Both indicate that ‘Volcano is exhibiting signs of elevated unrest above known background level’.

Information
Global Volcanism Program: Okmok – summary information for Okmok (1101-29-)
Alaska Volcano Observatory Okmok eruption page – Okmok information and updates from 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.

The Volcanism Blog

Okmok update, 2 August 2008 2 August 2008

Posted by admin in activity reports, Alaska, eruptions, Okmok, United States.
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Okmok's eruption plume 30 July 2008 (Image courtesy of Lt William Mowitt, National Oceanic and Atmospheric Administration)

No dramatic developments at Okmok, but the eruption continues. The latest weekly report from the Alaska Volcano Observatory comments that over the last week an ash and steam plume reaching altitudes of between 3000 and 10600 metres (10000-35000 feet) have been continuously erupted and light ash fall has taken place on Umnak and Unimak islands. From 28 to 30 July Okmok went to aviation colour code red because of a particularly vigorous eruptive episode: it is currently at colour code orange. Seismic activity is elevated but steady. During this eruption there have been periods of continuous and pulsating tremor strong enough to register on the seismic networks of neighbouring Alaskan volcanoes.

Image: Photo of Okmok’s eruption plume on July 30, 2008, as seen from the NOAA ship Oscar Dyson, located about 80 nautical miles to the north of Okmok. Photograph taken by Lt William Mowitt, National Oceanic and Atmospheric Administration. [source]

Information
Global Volcanism Program: Okmok – summary information for Okmok (1101-29-)
Alaska Volcano Observatory Okmok eruption page – Okmok information and updates from the AVO

The Volcanism Blog

Okmok satellite image 24 July 2008

Posted by admin in Alaska, eruptions, natural hazards, Okmok, United States.
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The NASA Earth Observatory has published an image of Alaska’s Okmok volcano in eruption, taken by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite yesterday, 23 July 2008. There was a great deal of cloud around, but the volcano’s plume, blowing eastwards and trending more to the south as it extends further from its source, shows clearly.

Okmok erupts, 23 July 2008 (NASA image)

The close-up below is taken from the large high-resolution version of the image. The dense white clouds over the caldera are water vapour, while the ash-laden plume, grey-brown in colour, streams away eastwards.

Okmok erupts, 23 July 2008 (NASA image)

Clicking on the images above will take you to the original source page. Credit: NASA image created by Jesse Allen, using data provided courtesy of the MODIS Rapid Response team.

Information
Global Volcanism Program: Okmok – summary information for Okmok (1101-29-)
Alaska Volcano Observatory Okmok eruption page – Okmok information and updates from the AVO

The Volcanism Blog