| 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. |
| Genre: | Article |
| ProdID: | 70014214 |
| Citation Author: | Johnston, M. J. S.; Mueller, R. J. |
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| Citation End Page: | 1203 |
| Citation Issue: | 4819 |
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| Citation Language: | English |
| Citation Larger Work Title: | Science |
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| Citation Number Of Pages: | 3 |
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| Citation Search Results Text: | Seismomagnetic observation during the 8 July 1986 magnitude 5.9 North Palm Springs earthquake; 1987; Article; Journal; Science; Johnston, M. J. S.; Mueller, R. J. |
| Citation Start Page: | 1201 |
| Citation Volume: | 237 |
| Citation Year: | 1987 |
| Type: | citation/reference |
| Text: | Seismomagnetic observation during the 8 July 1986 magnitude 5.9 North Palm Springs earthquake; 1987; Article; Journal; Science; Johnston, M. J. S.; Mueller, R. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1987 00:00 -0600 |
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