(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	(20200226/2100Z)
(3) Volcano:	Westdahl (VNUM #311340)
(4) Current Color Code:	UNASSIGNED
(5) Previous Color Code:
(6) Source:	Alaska Volcano Observatory
(7) Notice Number:
(8) Volcano Location:	N 54 deg 31 min W 164 deg 38 min
(9) Area:	Aleutians
(10) Summit Elevation:	5118 ft (1560 m)
(11) Volcanic Activity Summary:	Over the past several weeks the real-time seismic data stream at Westdahl volcano has ceased due to equipment problems in the field. Repairs are not feasible during the winter months. Without seismic data AVO cannot verify that the volcano is at its normal background state. Thus, the Aviation Color Code and Volcano Alert Levels are now UNASSIGNED. Planned field work in April and during the summer will reestablish and improve the seismic monitoring network. At this time, rapid detection of an eruption (if one were to occur) may be possible using a combination of distant seismic and infrasound networks, lightning, and satellite data.
(12) Volcanic cloud height:	n/a
(13) Other volcanic cloud information:	n/a
(14) Remarks:
(15) Contacts:	Michelle Coombs, Scientist-in-Charge, USGS mcoombs@usgs.gov (907) 786-7497 David Fee, Coordinating Scientist, UAFGI dfee1@alaska.edu (907) 322-4085
(16) Next Notice:

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AVO/USGS Volcanic Activity Notice

Volcano: Westdahl (VNUM #311340)

Current Volcano Alert Level: UNASSIGNED

Current Aviation Color Code: UNASSIGNED

Issued: Wednesday, February 26, 2020, 12:00 PM AKST
Source: Alaska Volcano Observatory
Notice Number:
Location: N 54 deg 31 min W 164 deg 38 min
Elevation: 5118 ft (1560 m)
Area: Aleutians

Volcanic Activity Summary: Over the past several weeks the real-time seismic data stream at Westdahl volcano has ceased due to equipment problems in the field. Repairs are not feasible during the winter months. Without seismic data AVO cannot verify that the volcano is at its normal background state. Thus, the Aviation Color Code and Volcano Alert Levels are now UNASSIGNED.

Planned field work in April and during the summer will reestablish and improve the seismic monitoring network. At this time, rapid detection of an eruption (if one were to occur) may be possible using a combination of distant seismic and infrasound networks, lightning, and satellite data.

Recent Observations:
[Volcanic cloud height] n/a
[Other volcanic cloud information] n/a

Contacts: Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@usgs.gov (907) 786-7497

David Fee, Coordinating Scientist, UAFGI
dfee1@alaska.edu (907) 322-4085

The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.

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