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| Titel |
A statistical analysis of electric self-potential time series associated to two 1993 earthquakes in Mexico |
| VerfasserIn |
L. Flores-Márquez, J. Márquez-Cruz, A. Ramírez-Rojas, G. Gálvez-Coyt, F. Angulo-Brown |
| 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 Science ; 7, no. 5 ; Nr. 7, no. 5 (2007-09-28), S.549-556 |
| Datensatznummer |
250004729
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| Publikation (Nr.) |
 copernicus.org/nhess-7-549-2007.pdf |
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| Zusammenfassung |
| Recent studies related with earthquake prediction involve statistical
studies of the ground electric self-potential behavior. Published results
about the complexity of this kind of processes encourage us to study the
statistical behavior of the ground electric self-potential recorded in
Guerrero state, Mexico. This region is characterized by high seismicity. The
electric self-potential variations were recorded in the Acapulco station
directly from the ground. The sampling period was four seconds and the data
were stored from March to December of 1993. Two significant earthquakes
(EQs) occurred near this station, 15 May and 24 October whose
magnitudes were Mw=6.0 and Mw=6.6 respectively. A preliminary
processing was carried out consisting of a moving average of the original
time series in order to filter the very high frequencies and to complete
short lacks of data and outliers. Then, a visual inspection of the complete
filtered signal was performed to search some seismic electric signals (SES),
which were ambiguously depicted. Subsequently, a detrending of µ=0 was
applied with the windows of 3.3, 6.6 and 10 h. Later, the analysis of
the spectral exponent β was made, showing changes during the total period
examined, and the most evident changes occurred during the preparation
mechanism of the Mw=6.6 EQ. Fifteen days before the 24 October
EQ, a Brownian-noise like behavior was displayed (β≈2), having a
duration of about two days. In addition a Higuchi fractal method and wavelet
analysis were made confirming the presence of the β-anomaly. |
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