Articles | Volume 15, issue 8
https://doi.org/10.5194/nhess-15-1873-2015
https://doi.org/10.5194/nhess-15-1873-2015
Research article
 | 
20 Aug 2015
Research article |  | 20 Aug 2015

Pre-earthquake magnetic pulses

J. Scoville, J. Heraud, and F. Freund

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Cited articles

Batllo, F., LeRoy, R. C., Parvin, K., Freund, F., and Freund, M. M.: Positive holes in magnesium oxide, Correlation between magnetic, electric, and dielectric anomalies, J. Applied Phys., 69, 6031–6033, 1991.
Bleier, T., Dunson, C., Maniscalco, M., Bryant, N., Bambery, R., and Freund, F.: Investigation of ULF magnetic pulsations, air conductivity changes, and infra red signatures associated with the 30 October Alum Rock M5.4 earthquake, Nat. Hazards Earth Syst. Sci., 9, 585–603, https://doi.org/10.5194/nhess-9-585-2009, 2009.
Bortnik, J., Bleier, T., Dunson, C., and Freund, F.: Estimating the seismotelluric current required for observable electromagnetic ground signals, Ann. Geophysics, 28, 1615–1624, 2010.
Campbell, W. H.: Natural magnetic disturbance fields, not precursors, preceding the Loma Prieta earthquake, J. Geophys. Res., 114, A05307, https://doi.org/10.1029/2008JA013932, 2009.
Dahlgren, R. P., Johnston, M. J., Vanderbilt, V. C., and Nakaba, R. N.: Comparison of the Stress-Stimulated Current of Dry and Fluid-Saturated Gabbro Samples, Bulletin of the Seismological Society of America, 2014.
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Short summary
A semiconductor model of rocks is shown to describe unipolar magnetic pulses, a phenomenon that has been observed prior to earthquakes. These pulses are suspected to be generated deep in the Earth's crust, in and around the hypocentral volume, days or weeks before earthquakes. Their extremely long wavelength allows them to pass through kilometers of rock, and the source of the pulses may be triangulated to pinpoint locations where stresses are building deep within the Earth.
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