(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	(20141028/2305Z)
(3) Volcano:	Shishaldin (VNUM #311360)
(4) Current Color Code:	ORANGE
(5) Previous Color Code:	ORANGE
(6) Source:	Alaska Volcano Observatory
(7) Notice Number:	2014/A14
(8) Volcano Location:	N 54 deg 45 min W 163 deg 58 min
(9) Area:	Aleutians
(10) Summit Elevation:	9373 ft (2857 m)
(11) Volcanic Activity Summary:	The ongoing low-level eruptive activity at Shishaldin Volcano has increased in intensity over the past several days. Elevated surface temperatures were observed in satellite images beginning on October 25, and early that evening seismic tremor began to be recorded on nearby seismic stations, accompanied by stronger thermal anomalies. New deposits of ash and ballistics darkened the summit area, indicating the activity was energetic enough to eject material from a depth of several hundred meters (~600 ft) within the summit crater. The activity was recorded on infrasound arrays located in Akutan, 90 mi (145 km) to the southwest, and Dillingham, 363 mi (585 km) to the northeast. No ash plumes have been reported or observed in satellite data; however, a steam and gas plume was visible in satellite imagery on Saturday, October 25. As of today, tremor continues and has increased in the past 24 hours.
(12) Volcanic cloud height:	Unknown
(13) Other volcanic cloud information:	Unknown
(14) Remarks:
(15) Contacts:	John Power, Scientist-in-Charge, USGS jpower@usgs.gov (907) 786-7497 Jeff Freymueller, Coordinating Scientist, UAFGI jeff.freymueller@gi.alaska.edu (907) 322-4085
(16) Next Notice:	A new VAN will be issued if conditions change significantly or alert levels are modified. While a VAN is in effect, regularly scheduled updates are posted at http://www.avo.alaska.edu

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AVO/USGS Volcanic Activity Notice

Volcano: Shishaldin (VNUM #311360)

Current Volcano Alert Level: WATCH

Current Aviation Color Code: ORANGE

Issued: Tuesday, October 28, 2014, 3:05 PM AKDT
Source: Alaska Volcano Observatory
Notice Number: 2014/A14
Location: N 54 deg 45 min W 163 deg 58 min
Elevation: 9373 ft (2857 m)
Area: Aleutians

Volcanic Activity Summary: The ongoing low-level eruptive activity at Shishaldin Volcano has increased in intensity over the past several days. Elevated surface temperatures were observed in satellite images beginning on October 25, and early that evening seismic tremor began to be recorded on nearby seismic stations, accompanied by stronger thermal anomalies. New deposits of ash and ballistics darkened the summit area, indicating the activity was energetic enough to eject material from a depth of several hundred meters (~600 ft) within the summit crater. The activity was recorded on infrasound arrays located in Akutan, 90 mi (145 km) to the southwest, and Dillingham, 363 mi (585 km) to the northeast.

No ash plumes have been reported or observed in satellite data; however, a steam and gas plume was visible in satellite imagery on Saturday, October 25. As of today, tremor continues and has increased in the past 24 hours.

Recent Observations:
[Volcanic cloud height] Unknown
[Other volcanic cloud information] Unknown

Contacts: John Power, Scientist-in-Charge, USGS
jpower@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI
jeff.freymueller@gi.alaska.edu (907) 322-4085

Next Notice: A new VAN will be issued if conditions change significantly or alert levels are modified. While a VAN is in effect, regularly scheduled updates are posted at
http://www.avo.alaska.edu

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