Subsidence at Kiska Volcano, Western Aleutians, detected by satellite radar interferometry

Details Subsidence at Kiska Volcano, Western Aleutians, detected by satellite radar interferometry Subsidence at Kiska Volcano, Western Aleutians, detected by satellite radar interferometry

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29r...2l&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 18, pp. 2-1, CiteID 1855, DOI 10.1029/2002GL014948

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5

Volcanology: Eruption Monitoring (7280), Volcanology: General Or Miscellaneous, Radio Science: Interferometry

Scientific paper

Sequential interferometric synthetic aperture radar images of Kiska, the westernmost historically active volcano in the Aleutian arc, show that a circular area about 3 km in diameter centered near the summit subsided by as much as 10 cm from 1995 to 2001, mostly during 1999 and 2000. An elastic Mogi-type deformation model suggests that the source is within 1 km of the surface. Based on the shallow source depth, the copious amounts of steam during recent eruptions, and recent field reports of vigorous steaming and persistent ground shaking near the summit area, we attribute the subsidence to decreased pore-fluid pressure within a shallow hydrothermal system beneath the summit area.

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