论文信息 - Preseismic anomalous telluric current signals observed in Kozu-shima Island, Japan

Preseismic anomalous telluric current signals observed in Kozu-shima Island, Japan

Monitoring of telluric current, which is practically a synonym for geoelectric potential difference, was conducted on Kozu-shima Island about 170 km south of Tokyo from May 14, 1997 to June 25, 2000. During the monitoring period, 19 anomalous telluric current changes (ATCs) were observed. Their possible correlation with nearby earthquakes was statistically examined by assuming various lead times for different ranges of magnitude and focal distance. The best correlation may be obtained for earthquakes with a magnitude greater than 3.0 occurring within 20 km of focal distance. There were 23 such earthquakes, of which 11 were preceded by ATCs within 30 d. Of these 11 earthquakes, preceding ATCs of 5 and 6 were positive and negative polarities of telluric current, respectively. Their epicenters were spatially well clustered in the east and west of the island. These facts were clearly beyond those expected by chance and led to a simple speculative model.

[1] T. Nagao,et al. Co‐seismic geoelectric potential changes observed in Japan , 2000 .

[2] Seiya Uyeda,et al. A possible case of SES selectivity at Kozu-shima Island, Japan , 2002 .

[3] R. Geller. Debate on evaluation of the VAN Method: Editor's introduction , 1996 .

[4] Panayiotis A. Varotsos,et al. The physics of seismic electric signals , 2005 .

[5] H. Tanaka,et al. Electric and magnetic phenomena observed before the volcano-seismic activity in 2000 in the Izu Island Region, Japan , 2002, Proceedings of the National Academy of Sciences of the United States of America.

[6] S. Uyeda,et al. Geoelectric potential changes: possible precursors to earthquakes in Japan. , 2000, Proceedings of the National Academy of Sciences of the United States of America.

[7] Sir James Lighthill. A Critical Review of Van: Earthquake Prediction From Seismic Electrical Signals , 1996 .

[8] Masashi Kamogawa,et al. The Prediction of Two Large Earthquakes in Greece , 2008 .

[9] Panayiotis A. Varotsos,et al. Natural Time Analysis: The New View of Time : Precursory Seismic Electric Signals, Earthquakes and other Complex Time Series , 2011 .