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ALASKA VOLCANO OBSERVATORY
Friday, November 30, 2001 10:30 AM AST (1930 UTC)
ANNOUNCING SEISMIC MONITORING OF WRANGELL VOLCANO
62°00'N, 144°01'W, Summit Elevation 4317 m (14,170')
Since summer 2001, AVO has been receiving seismic data from four stations on Wrangell Volcano located within Wrangell-St. Elias National Park and Preserve 80 km (50 mi) east of Glennallen. These stations, in conjunction with regional stations operated by the Alaska Earthquake Information Center, provide suitable redundancy and detection capabilities. After several months of data collection, we now have an understanding of background seismicity. As of today, Wrangell is added to our list of seismically monitored volcanoes in Alaska.
Wrangell is a large, andesitic shield volcano capped by an ice-filled caldera. It is considered the only historically active volcano in the Wrangell volcanic field with one recorded eruption in 1900.
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.
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.