DOI-USGS-AVO-2009-10-16T12:06:47-08:00 avo-sci@usgs.gov 2009-10-16 12:06:46 Actual Update Public http://www.avo.alaska.edu/activity/ Geo Volcanic activity Unknown Minor Unlikely 2009-10-16 12:06:46 2009-10-17 12:06:46 Alaska Volcano Observatory Shishaldin Weekly Update Seismic activity at Shishaldin remains low. The Webcam has been inoperable since October 10, and satellite views this week have been mostly obscured by clouds. Shishaldin volcano, located near the center of Unimak Island in the eastern Aleutian Islands, is a spectacular symmetric cone with a base diameter of approximately 10 miles (16 km). A small summit crater typically emits a noticeable steam plume with occasional small amounts of ash. Shishaldin is one of the most active volcanoes in the Aleutian volcanic arc, erupting atleast 28 times since 1775. Most of Shishaldin's eruptions have consisted of small ash and steam plumes, although the most recent eruption in April-May 1999 produced an ash column that reached a height of 45,000 ft above sea level. http://www.avo.alaska.edu/activity/Shishaldin.php Tom Murray, Scientist-in-Charge, USGS tlmurray@usgs.gov (907) 786-7497 Steve McNutt, Coordinating Scientist, UAF steve@giseis.alaska.edu (907) 474-7131 Volcano Alert Level=ADVISORY Aviation Color Code=YELLOW Shishaldin volcano Alaska Aleutians 54.7554 -163.9711 CAVW=1101-36-