December 30 , 2016. EN. Bogoslof , Update 15 h.

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December 30 , 2016. EN. Bogoslof , Update 15 h.

December 30 , 2016.


Bogoslof ,  Aleutians Islands , Alaska :

Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE

Issued: Thursday, December 29, 2016, 11:43 PM AKST
Source: Alaska Volcano Observatory
Location: N 53 deg 55 min W 168 deg 2 min
Elevation: 492 ft (150 m)
Area: Aleutians


AVO ImageVolcanic Activity Summary:
Seismic data from nearby islands detected an increase in discrete volcanic seismicity from Bogoslof volcano starting at 19:00 Dec 29 AKST (04:00 UTC Dec 30) today. The activity progressed, merging into a continuous tremor sequence indicative of a possible ash-producing eruption, as was seen with the eruption on December 21. Nothing has yet been observed in satellite data and no lightning strikes associated with an ash cloud have yet been detected. We will provide additional details once they are available.

Current Aviation Color Code: RED
Previous Aviation Color Code: ORANGE

Volcanic Activity Summary:
An ash-producing eruption started at 23:45 Dec 29 AKST (08:45 Dec 30 UTC) and is continuing as recorded by seismic data on nearby islands and as seen in recent satellite images. Cloud-top temperatures from satellite suggest a cloud height of around 20,000 ft asl. Regional winds are from the southwest. We are raising the Aviation Color Code to RED and the Alert Level to WARNING.

AVO has no ground-based volcano monitoring equipment on Bogoslof volcano. We continue to monitor satellite images, information from the Worldwide Lightning Location Network pertaining to volcanic-cloud lightning, and data from seismic and infrasound instruments on other islands for indications of volcanic activity. At present, these observations should allow timely detection of additional explosive events.


Source : AVO

Photo : Tuvman, Paul

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