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ALASKA VOLCANO OBSERVATORY
Friday, May 17, 2002 11:00 AM ADT (1900 UTC)
Seismic activity is monitored in real time at 23 volcanoes in Alaska. Satellite images of all Alaskan volcanoes are analyzed daily for evidence of ash plumes and elevated surface temperatures. Some volcanoes may currently display anomalous behavior but are not considered to be at a dangerous level of unrest.
Shishaldin Volcano: AVO detected an increase in background seismicity at Shishaldin over the last week, including increased numbers of locatable shallow low-frequency events and several 2-3 minute-long tremor-like signals that we infer are from a deep source. However, no thermal anomalies have been seen on satellite imagery, and no eyewitness reports of anomalous activity have been received by AVO. Shishaldin continues to be at color code GREEN.
Wrangell, Spurr, Redoubt, Iliamna, Augustine, Snowy, Griggs, Katmai, Novarupta, Trident, Mageik, Martin, Aniakchak, Pavlof, Dutton, Isanotski, Shishaldin, Fisher, Westdahl, Akutan, Makushin, Great Sitkin, and Kanaga volcanoes are in color code GREEN. All are at or near normal levels of background seismicity. AVO did not detect ash plumes or significant elevated surface temperatures in the vicinity of any volcano.