Natural Magnetic Fields Preceding the Loma Prieta Earthquake that Damaged San Francisco in October 1989

Details Natural Magnetic Fields Preceding the Loma Prieta Earthquake that Damaged San Francisco in October 1989 Natural Magnetic Fields Preceding the Loma Prieta Earthquake that Damaged San Francisco in October 1989

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmgp23a..01c&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #GP23A-01

Physics

1513 Geomagnetic Excursions, 1530 Rapid Time Variations, 2722 Forecasting, 7223 Seismic Hazard Assessment And Prediction

Scientific paper

Available records of the magnetic indices Dst and ap together with USGS standard observatory recordings of the 1-min fields are examined for the time preceding the Loma Prieta earthquake that severely damaged the San Francisco area in October, 1989. The results indicate that a 1990 report claiming the existence of a ULF geomagnetic field precursor signal foretelling a nearby earthquake is very likely false. The observatory study shows that the ULF signal was not local but rather widespread throughout the western United States and therefore expected to be of solar-terrestrial disturbance origin. The two planetary activity indices support this conclusion.

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