Skip to main content
Advanced Search

Filters: Tags: Pyroclastic Surge (X)

1 result (246ms)   

View Results as: JSON ATOM CSV
thumbnail
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...


    map background search result map search result map Preliminary volcano-hazard assessment for Fisher volcano, Unimak Island, Alaska Preliminary volcano-hazard assessment for Fisher volcano, Unimak Island, Alaska