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| Titel |
Pre-earthquake magnetic pulses |
| VerfasserIn |
J. Scoville, J. Heraud, F. Freund |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 15, no. 8 ; Nr. 15, no. 8 (2015-08-20), S.1873-1880 |
| Datensatznummer |
250119641
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| Publikation (Nr.) |
 copernicus.org/nhess-15-1873-2015.pdf |
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| Zusammenfassung |
| 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 even weeks before earthquakes. Their extremely
long wavelength allows them to pass through kilometers of rock.
Interestingly, when the sources of these pulses are triangulated, the
locations coincide with the epicenters of future earthquakes. We couple a
drift-diffusion semiconductor model to a magnetic field in order to describe
the electromagnetic effects associated with electrical currents flowing
within rocks. The resulting system of equations is solved numerically and it
is seen that a volume of rock may act as a diode that produces transient
currents when it switches bias. These unidirectional currents are expected to
produce transient unipolar magnetic pulses similar in form, amplitude, and
duration to those observed before earthquakes, and this suggests that the
pulses could be the result of geophysical semiconductor processes. |
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