Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 112, Issue 4, Pages 986-989Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1422893112
Keywords
criticality; seismic electric signals; natural time analysis
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Funding
- Grants-in-Aid for Scientific Research [26350483] Funding Source: KAKEN
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Using the Japan Meteorological Agency earthquake catalog, we investigate the seismicity variations before major earthquakes in the Japanese region. We apply natural time, the new time frame, for calculating the fluctuations, termed beta, of a certain parameter of seismicity, termed kappa(1). In an earlier study, we found that beta calculated for the entire Japanese region showed a minimum a few months before the shallow major earthquakes (magnitude larger than 7.6) that occurred in the region during the period from 1 January 1984 to 11 March 2011. In this study, by dividing the Japanese region into small areas, we carry out the beta calculation on them. It was found that some small areas show beta minimum almost simultaneously with the large area and such small areas clustered within a few hundred kilometers from the actual epicenter of the related main shocks. These results suggest that the present approach may help estimation of the epicentral location of forthcoming major earthquakes.
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