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Seismomagnetic observation during the 8 July 1986 magnitude 5.9 North Palm Springs earthquake

Science

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Abstract

A differentially connected array of 24 proton magnetometers has operated along the San Andreas fault since 1976. Seismomagnetic offsets of 1.2 and 0.3 nanotesla were observed at epicentral distances of 3 and 9 kilometers, respectively, after the 8 July 1986 magnitude 5.9 North Palm Springs earthquake. These seismomagnetic observations are the first obtained of this elusive but long-anticipated effect. The data are consistent with a seismomagnetic model of the earthquake for which right-lateral rupture of 20 centimeters is assumed on a 16-kilometer segment of the Banning fault between the depths of 3 and 10 kilometers in a region with average magnetization of 1 ampere per meter. Alternative explanations in terms of electrokinetic effects and earthquake-generated electrostatic charge redistribution seem unlikely because the changes are permanent and complete within a 20-minute period.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Seismomagnetic observation during the 8 July 1986 magnitude 5.9 North Palm Springs earthquake
Series title:
Science
Volume
237
Issue:
4819
Year Published:
1987
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1201
Last page:
1203
Number of Pages:
3