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Absence of strain accumulation in the Shumagin seismic gap, Alaska, 1980-1987 ( USA).

Journal of Geophysical Research

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Abstract

Measurements of the deformation of a trilateration network in the Shumagin seismic gap in the interval 1980-1987 failed to detect any significant strain accumulation (observed extension rate in the direction of plate convergence 0.00 + or - 0.03 mu strain/yr). Dislocation models of the subduction process and measurements at a comparable network at a known seismic subduction zone (Nankai Trough, Japan) suggest that a rate of the order of -0.2 mu strain/yr should have been observed if the main thrust zone beneath the Shumagin Islands were locked. The simplest explanation of the observed absence of strain accumulation in the Shumagin seismic gap is that the main thrust zone beneath the Shumagin Islands is not presently locked. Other possible explanations depend upon very particular circumstances.-Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Absence of strain accumulation in the Shumagin seismic gap, Alaska, 1980-1987 ( USA).
Series title:
Journal of Geophysical Research
Volume
93
Issue:
B7
Year Published:
1988
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Geophysical Research
First page:
7909
Last page:
7922
Number of Pages:
14