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Geoelectric potential monitoring at Kozu-shima Island, Japan and the seismicity in its surrounding area
Orihara, Y.; Yamaguchi, T.; Nagao, T.; Uyeda, S. (1999). Geoelectric potential monitoring at Kozu-shima Island, Japan and the seismicity in its surrounding area. Bull. Inst. Oceanic Res. & Develop., Tokai Univ. 20: 17-30
In: Bulletin of Institute of Oceanic Research and Development. Tokai University. Tokai University. Institute of Oceanic Research and Development: Shimizu. ISSN 0289-680X, more
Peer reviewed article  

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  • Orihara, Y.
  • Yamaguchi, T.
  • Nagao, T.
  • Uyeda, S.

Abstract
    Geoelectric potential monitoring at Kozu-shima Isalnd, Japan, was initiated in April, 1997. This island was considered to be appropriate to test the VAN-method of short-term earthquake prediction in Japan because of its low level of artificial noise and relatively high nearby seismicity. There were 45 anomalous changes, or possible seismic electric signals (SES), in geoelectric potential and 42 M>3.0 (depth<100 km) earthquakes within a radius of about 30 km around the island during the observation period (April, 1997-May, 1998). The anomalous changes that ocurred on May 20 and 21, 1997 were by far the most outstanding compared with other changes. These changes were followed by a nearby M5.1 (JMA) earthquake of May 22, 1997, and a M5.9 (JMA) earthquake of May 24, 1997 in Enshu-nada roughly 155 km west of the island. The former earthquake was the only M>5.0 (depth<100 km) event that occurred within 30 km from the island and the latter was the only M>5.5 (depth<100 km) even within 200 km. The above two outstanding anomalous changes and earthquakes may have been correlated. The latter correlaton, however, is less convincing because the focal distance is large and no other stations in the mainland recorded simultaneous change.

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