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| Titel |
Variations of geoelectric potential differences associated with an anomalous volumetric strain change in the region of expected Tokai Earthquake, Japan |
| VerfasserIn |
Y. Orihara, M. Kamogawa, T. Nagao, S. Uyeda |
| 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 ; 12, no. 1 ; Nr. 12, no. 1 (2012-01-12), S.121-127 |
| Datensatznummer |
250010410
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| Publikation (Nr.) |
 copernicus.org/nhess-12-121-2012.pdf |
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| Zusammenfassung |
| For the prediction of the expected Tokai Earthquake (EQ),
Japan Meteorological Agency (JMA) has been observing volumetric strain
changes to detect its presumed pre-slip phenomena in Tokai and South Kanto
regions. In 1998, an anomalous volumetric strain change, lasting for 5 days,
which initially attracted much attention as a possible precursor to the
Tokai EQ, was observed at Shimizu station in the Tokai area. Eventually, the Tokai EQ did
not occur and the causal mechanism of the observed anomaly was
unknown. However, we found variations of geoelectric potential differences
(GPD) possibly associated with the anomaly by applying Principal Component
Analysis (PCA) to the GPD data taken in the same area. From the polarities
of the observed GPD changes, we infer that these GPD variations were caused
by electrokinetic effects of groundwater motion, which might have been
related with the strain changes. These results imply that the GPD
observations may assist us in understanding the nature of EQ precursory
phenomena. |
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