![]() ![]() Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys. On 7 August 2008, Kasatochi began erupting explosively with an ash plume reaching 45,000 feet. The Alaska Volcano Observatory is a cooperative program of the U.S. Kasatochi Island (Aleut: Qanan-tanax Russian: ), also known as Kasatochi volcano, is an active stratovolcano and part of the Andreanof Islands subgroup of the Aleutian Islands of southwestern Alaska. (14 km) above sea level.Ĭhris Waythomas, Acting Scientist-in-Charge, USGS, (907) 786-7497ĭavid Fee, Coordinating Scientist, UAFGI, (907) 378-5460 Most eruptions are relatively small, although the April-May 1999 event generated an ash column that reached 45,000 ft. Shishaldin is one of the most active volcanoes in the Aleutian volcanic arc, with at least 54 episodes of unrest including over 26 confirmed eruptions since 1824. (200 m) wide funnel-shaped summit crater typically emits a steam plume and occasional small amounts of ash. 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). (9 km) above sea level moving northeast, see SIGMET Trace ashfall possible downwind of the volcano, see Special Weather Statement Likely on all flanks Likely on all flanks Remarks: (9 km) above sea level Plume is moving northeast Hazard Analysis: 30,000 ft. In addition to the local monitoring network, AVO uses nearby geophysical networks, regional infrasound and lighting data, and satellite images to detect eruptions. The local monitoring network has been partially impaired over the last few weeks due to telecommunications issues but seismic stations and web cameras south of the volcano were brought back online on July 19. Shishaldin Volcano is monitored by local seismic and infrasound sensors, web cameras, and a telemetered geodetic network. Pyroclastic and mudflows are likely on the immediate flanks of the volcano. The National Weather Service has issued a SIGMET for this ash cloud, and a Special Weather Statement has been issued for possible trace ash on False Pass.īased on previous eruption cycles, significant ash emissions are likely to continue for an hour or more. In response, the aviation Color Code is being raised to RED and the Volcano Alert Level is being raised to WARNING. ![]() This follows a several-hour increase in observed eruptive activity. (9 km) was observed in satellite data and pilot reports at 11:30 pm AKDT (07:30 UTC on July 23). Location: N 54 deg 45 min W 163 deg 58 minĪn ash cloud from Shishaldin Volcano reaching 30,000 ft. ![]()
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