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| Titel |
The possible statistical relation of Pc1 pulsations to Earthquake occurrence at low latitudes |
| VerfasserIn |
J. Bortnik, J. W. Cutler, C. Dunson, T. E. Bleier |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 26, no. 9 ; Nr. 26, no. 9 (2008-09-22), S.2825-2836 |
| Datensatznummer |
250016230
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| Publikation (Nr.) |
 copernicus.org/angeo-26-2825-2008.pdf |
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| Zusammenfassung |
| We examine the association between earthquakes and Pc1 pulsations
observed at a low-latitude station in Parkfield, California. The
period under examination is ~7.5 years in total, from February
1999 to July 2006, and we use an automatic identification algorithm
to extract information on Pc1 pulsations from the magnetometer data.
These pulsations are then statistically correlated to earthquakes
from the USGS NEIC catalog within a radius of 200 km around the
magnetometer, and M>3.0. Results indicate that there is an
enhanced occurrence probability of Pc1 pulsations ~5–15 days
in advance of the earthquakes, during the daytime. We quantify the
statistical significance and show that such an enhancement is
unlikely to have occurred due to chance alone. We then examine the
effect of declustering our earthquake catalog, and show that even
though significance decreases, there is still a statistically
significant daytime enhancement prior to the earthquakes. Finally,
we select only daytime Pc1 pulsations as the fiducial time of our
analysis, and show that earthquakes are ~3–5 times more likely
to occur in the week following these pulsations, than normal.
Comparing these results to other events, it is preliminarily shown
that the normal earthquake probability is unaffected by geomagnetic
activity, or a random event sequence. |
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