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Proceedings Paper

ULF/ELF polarimetry: observations of anomalous ULF signals preceding the Northridge earthquake of January 17, 1994
Author(s): Jack Y. Dea; Peder M. Hansen; Wolfgang-Martin Boerner
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Paper Abstract

Continuous ULF background data are recorded at the Low Frequency Observatory in San Diego since 1990. Some 18 days preceding the large Northridge earthquake of January 17, 1994. Anomalous signals of approximately twice the background level were recorded. The timing of the anomalous signals, the return to normal levels after the quake and a delay in the onset of higher frequency anomalous signals all suggest a strong correlation of the anomalous signals with the events at Northridge. A simple model of migrating micro- fractures is used to explain the temporal characteristics of the signals.

Paper Details

Date Published: 23 December 1997
PDF: 12 pages
Proc. SPIE 3120, Wideband Interferometric Sensing and Imaging Polarimetry, (23 December 1997); doi: 10.1117/12.300623
Show Author Affiliations
Jack Y. Dea, Naval Command, Control and Ocean Surveillance Ctr. (United States)
Peder M. Hansen, Naval Command, Control and Ocean Surveillance Ctr. (United States)
Wolfgang-Martin Boerner, Univ. of Illinois/Chicago (United States)


Published in SPIE Proceedings Vol. 3120:
Wideband Interferometric Sensing and Imaging Polarimetry
Harold Mott; Wolfgang-Martin Boerner, Editor(s)

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