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

Geophysical Research Letters

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Abstract

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.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Subsidence at Kiska volcano, Western Aleutians, detected by satellite radar interferometry
Series title:
Geophysical Research Letters
Volume
29
Issue:
18
Year Published:
2002
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters
First page:
2
Last page:
1
Number of Pages:
0