Seismicity in East Shikoku using Unified Focus Data by J.M.A. from Oct. 1997 to Dec. 2005
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Accession number;07A0041909
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| Title;Seismicity in East Shikoku using Unified Focus Data by J.M.A. from Oct. 1997 to Dec. 2005 |
| Author;
KONOMI TADASHI
(Kyoto Univ., Disaster Prev. Res. Inst., JPN)
MATSUMURA KAZUO
(Kyoto Univ., Disaster Prev. Res. Inst., JPN)
KONDO KAZUO
(Kyoto Univ., Disaster Prev. Res. Inst., JPN)
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Journal Title;Abstracts for Annuals. Disaster Prevention Research Institute, Kyoto University (CD-ROM)
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Journal Code:S0431B
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ISSN:
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VOL.;NO.49;PAGE.NO.49B,277-282(2006)
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| Figure&Table&Reference;FIG.8, TBL.2, REF.5 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;It is considered that before Nankai earthquake a little long period of very low seismicity in the crust appears due to decrease of the deviatoric stress between the stress of present E-W direction and ones of added N-S direction which is main tectonic stress in the mantle. Further, just before great earthquake, it is expected that seismicity in the mantle also goes to low level. So we examined time series and frequency distribution to magnitude for the data set of unified hypocenters by J.M.A. in 8 years. For two regions of seismic layer, or crustal earthquakes and mantle ones, Gutenberg and Richter's relation is looked for and the coefficients are determined as 'a' value equal 3.39 and 3.29 and 'b' value equal 0.79 and 0.71 respectively. The signals moving to low seismicity level will be detected by the continuous careful watching of 'a' and 'b' values. (author abst.) |
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