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Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Contacts Alaska Division of Geological & Geophysical Surveys Gardner, J.E. Schaefer, J.R. Stelling, P.L. Tag Types Theme (1) Place (1) Tag Schemes Alaska Division of Geological & Geophysical Surveys (1) ISO 19115 Topic Category (1) View Results as: JSON ATOM CSV

Preliminary volcano-hazard assessment for Fisher volcano, Unimak Island, Alaska Fisher volcano, containing the largest Holocene caldera in the Aleutian volcanic arc, is an active volcano near the center of Unimak Island, about 120 kilometers southwest of Cold Bay and about 175 kilometers northeast of Dutch Harbor. The volcano is composed of numerous small volcanic centers around and within a large, oval caldera 12 by 18 kilometers in diameter and 500 to 1,000 meters deep that formed during a catastrophic eruption about 9,400 years ago. Since then, more than 30 separate vents inside and outside the caldera have erupted; the most recent eruption occurred in 1826. These eruptions have produced lava flows and widespread tephra (volcanic ash) deposits, and have occasionally been accompanied by large... Tags: Active Volcanoes, Aleutian Arc, Aleutian Islands, Ash Cloud, Ash Fall, All tags... Ballistics, Caldera, Debris Flow, Fisher, Flood, Geologic Hazards, Geothermal, Hazards, Lahar, Lava Flow, Pumice, Pyroclastic Flow, Pyroclastic Surge, Tephra, Unimak Quadrangle, Volcanic Ash, Volcanic Gas, Volcaniclastics, Volcanology, geoscientificInformation, Fewer tags