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Veniaminof reported activity

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EVENT SPECIFIC INFORMATION

Event Name : Veniaminof 2009/1

Start:January 8, 2009 ± 7 DaysObserved
Stop:October 19, 2009 Observed

Phreatic: BibCard
Eruption Type:Explosive
Other""

Description: From McGimsey and others (2014): "On January 8, 2009, a pilot reported seeing a wispy, light-gray plume between 6,500 and 10,500 ft (1,980 and 3,200 m), and extending 28 km (15 mi) downwind from the volcano. A passenger in an aircraft took a photograph of the plume. The AVO/USGS web camera located at nearby Perryville also captured the plume that day.

"AVO remote sensing experts interpreted the 'gray tone' attributed to the plume to be backscatter shadow from the plume rather than ash content. Similar steaming was recorded in web camera images most of the previous week and again during the week of March 17. The web camera became inoperative on March 17 due to relocation of the village office hosting the camera. The camera would not come back online until May 27, 2009.

"In response to an increase in seismic activity across the entire network, AVO issued a VAN on May 7, 2009, elevating the Aviation Color Code/Volcanic Alert Level to YELLOW/ADVISORY. Because the web camera was inoperative, calls to local observers on May 9 produced reports of a 'steady stream of light steam, with occasional small puffs.' Low-level tremor was recorded the week of May 18, but the activity soon diminished, and with no further visual reports of activity, on May 26, 2009, AVO issued a VAN downgrading the volcano to GREEN/NORMAL. A few days later, on May 29, tremor returned and abruptly increased later in the day. The web camera was once again operating, but the view on this day was obscured by clouds. Nothing unusual was noted in satellite images. Tremor continued through May 30, 2009, but at a lower amplitude than previously recorded, and then diminished entirely. Thus, no change in status was forthcoming.

"On June 23-24, 2009, a small swarm of low-frequency earthquakes was recorded at Veniaminof, the last of the calendar year as the network began deteriorating. On the morning of October 19, 2009, a U.S. Coast Guard flight crew flying over Bristol Bay reported 'steady smoke and ash' coming from the center of Veniaminof. Web camera images at the time showed a voluminous, low-level steam plume over the volcano, but no indication of ash.

"On November 17, 2009, due to continued station outage, reducing the network to only a single station, AVO issued a VAN downgrading the volcano from Aviation Color Code/Volcano Alert Level GREEN/NORMAL to UNASSIGNED, and delisting it from the inventory of seismically monitored Alaska volcanoes. The volcano would remain at this status through the remainder of 2009."

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Page modified: March 30, 2017 14:36
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