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Aseismic inflation of Westdahl volcano, Alaska, revealed by satellite radar interferometry

Geophysical Research Letters

By:
, , , , , ,
DOI: 10.1029/1999GL011283

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Abstract

Westdahl volcano, located at the west end of Unimak Island in the central Aleutian volcanic arc, Alaska, is a broad shield that produced moderate-sized eruptions in 1964, 1978-79, and 1991-92. Satellite radar interferometry detected about 17 cm of volcano-wide inflation from September 1993 to October 1998. Multiple independent interferograms reveal that the deformation rate has not been steady; more inflation occurred from 1993 to 1995 than from 1995 to 1998. Numerical modeling indicates that a source located about 9 km beneath the center of the volcano inflated by about 0.05 km3 from 1993 to 1998. On the basis of the timing and volume of recent eruptions at Westdahl and the fact that it has been inflating for more than 5 years, the next eruption can be expected within the next several years.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Aseismic inflation of Westdahl volcano, Alaska, revealed by satellite radar interferometry
Series title:
Geophysical Research Letters
DOI:
10.1029/1999GL011283
Volume
27
Issue:
11
Year Published:
2000
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters
First page:
1567
Last page:
1570
Number of Pages:
4