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| Titel |
A precursory ULF signature for the Chi-Chi earthquake in Taiwan |
| VerfasserIn |
Y. Akinaga, M. Hayakawa, J. Y. Liu, K. Yumoto, K. Hattori |
| 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 ; 1, no. 1/2 ; Nr. 1, no. 1/2, S.33-36 |
| Datensatznummer |
250000018
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| Publikation (Nr.) |
 copernicus.org/nhess-1-33-2001.pdf |
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| Zusammenfassung |
| ULF emission data at
Lunping (epicentral distance, 120 km) have been analysed for the Chi-Chi
earthquake (with magnitude 7.6 and depth of 11 km) in Taiwan which
occurred on 21 September 1999. Simple intensity analyses have not yielded
any significant results but we have found, based on the analysis of
polarization (the ratio of vertical magnetic field component Z to the
horizontal component G), that the polarization (Z/G) showed a significant
enhancement for two months before the earthquake. This kind of temporal
evolution of polarization seems to be very similar to previous results, so
that it is highly likely that this phenomenon may be associated with the
Chi-Chi earthquake. Also, the comparison of the results of polarization
analyses, by changing the signal threshold, has given us an approximate
intensity of the seismogenic emission of the order of the monthly mean
value. |
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