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| Titel |
Analysis of the ULF electromagnetic emission related to seismic activity, Teoloyucan geomagnetic station, 1998-2001 |
| VerfasserIn |
A. Kotsarenko, R. Pérez Enríquez, J. A. López Cruz-Abeyro, S. Koshevaya, V. Grimalsky, F. R. Zúñiga |
| 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 ; 4, no. 5/6 ; Nr. 4, no. 5/6 (2004-11-01), S.679-684 |
| Datensatznummer |
250001384
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| Publikation (Nr.) |
 copernicus.org/nhess-4-679-2004.pdf |
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| Zusammenfassung |
| Results of ULF geomagnetic measurements at station Teoloyucan (Central
Mexico, 99.11'35.735''W, 19.44'45.100''N, 2280m height) in relation to
seismic activity in the period 1998-2001 and their analysis are presented.
Variations of spectral densities for horizontal and vertical components,
polarization densities and spectrograms of magnetic field, their derivatives
are analyzed as a part of traditional analysis in this study. Values of
spectral density were calculated for 6 fixed frequencies f=1, 3, 10, 30, 100 and 300mHz. Fractal
characteristics of spectra were analyzed in the conception of SOC
(Self-Organized Criticality). 2 nighttime intervals, 0-3 and 3-6h by
local time have been used to decrease the noise interference in row data. In
order to exclude the intervals with a high geomagnetic activity from
analysis we referred to Ap indices, calculated for corresponding time
intervals. The contribution of seismic events to geomagnetic emission was
estimated by seismic index ks=100.75Ms/10D, where Ms is the amplitude of the
earthquake and D is the distance from its epicenter to the station. |
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