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An episode of reinflation of the Long Valley Caldera, eastern California: 1989-1991

Journal of Geophysical Research

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, , ,

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Abstract

Following the episodes of inflation of the resurgent dome associated with the May 1980 earthquake sequence (four M 6 earthquakes) and the January 1983 earthquake swarm (two M 5.2 events), 7 years of frequently repeated two-color geodimeter measurements spanning the Long Valley caldera document gradually decreasing extensional strain rates from 5 ppm/yr in mid-1983, when the measurements began, to near zero in mid-1989. Early October 1989 marked a change in activity when measurements of the two-color geodimeter network showed a significant increase in extensional strain rate (9 ppm/yr) across the caldera. The seismic activity began exceeding 10 M ??? 1..2 per week in early December 1989 and rapidly increased to a sustained level of tens of M ??? 1.2 per week with bursts having hundreds of events per day. The episode of inflation can be modeled by a single Mogi point source located about 7 km beneath the center of the resurgent dome. -from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
An episode of reinflation of the Long Valley Caldera, eastern California: 1989-1991
Series title:
Journal of Geophysical Research
Volume
98
Issue:
B9
Year Published:
1993
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article