On the seismic regime of the Japan region before the Tohoku mega-earthquake (Mw = 9)
The seismic regime taking place before the Tohoku mega-earthquake was studied using the catalog of the Japan Meteorological Agency (JMA). We show that the Tohoku earthquake was preceded by a 6–7-year period of regional reduction in the b -value and in the rate of main shocks. The space-time regions...
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| Veröffentlicht in: | Journal of volcanology and seismology 2013-07, Vol.7 (4), p.243-251 |
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| creator | Rodkin, M. V. Tikhonov, I. N. |
| description | The seismic regime taking place before the Tohoku mega-earthquake was studied using the catalog of the Japan Meteorological Agency (JMA). We show that the Tohoku earthquake was preceded by a 6–7-year period of regional reduction in the
b
-value and in the rate of main shocks. The space-time regions that involved precursory activation were nearly identical with the predictive phenomena that were previously detected by A.A. Lyubushin from an analysis of seismic noise based on data from the Japanese F-net. We discovered a previously unknown effect of correlation between the number of main shocks and the
b
-value. Both the ordinary foreshock activation and the longer weaker tendency, which consist in a precursory increase in the seismicity rate, were identified in the vicinities of
M
≈ 7 Japanese earthquakes (similarly to the seismicity in the Generalized Vicinities of large earthquakes based on worldwide data). |
| doi_str_mv | 10.1134/S0742046313030056 |
| format | Article |
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b
-value and in the rate of main shocks. The space-time regions that involved precursory activation were nearly identical with the predictive phenomena that were previously detected by A.A. Lyubushin from an analysis of seismic noise based on data from the Japanese F-net. We discovered a previously unknown effect of correlation between the number of main shocks and the
b
-value. Both the ordinary foreshock activation and the longer weaker tendency, which consist in a precursory increase in the seismicity rate, were identified in the vicinities of
M
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b
-value and in the rate of main shocks. The space-time regions that involved precursory activation were nearly identical with the predictive phenomena that were previously detected by A.A. Lyubushin from an analysis of seismic noise based on data from the Japanese F-net. We discovered a previously unknown effect of correlation between the number of main shocks and the
b
-value. Both the ordinary foreshock activation and the longer weaker tendency, which consist in a precursory increase in the seismicity rate, were identified in the vicinities of
M
≈ 7 Japanese earthquakes (similarly to the seismicity in the Generalized Vicinities of large earthquakes based on worldwide data).</description><subject>Earth and Environmental Science</subject><subject>Earth Sciences</subject><subject>Earthquakes</subject><subject>Geochemistry</subject><subject>Geology</subject><subject>Geophysics/Geodesy</subject><subject>Seismic activity</subject><issn>0742-0463</issn><issn>1819-7108</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNp1kM1OwzAQhC0EElXpA3CzxKUcArux48QHDqjiV6AeKOfIcTdt2iZu7UaItydtOSAQp5VmvhmthrFzhCtEIa_fIJUxSCVQgABI1BHrYYY6ShGyY9bb2dHOP2WDEBYAgFkSizjpscm44ds58UBVqCvLPc2qmrgr9-qzWZtmr7mGF1Q6T3t94uZu2fKaZiYi47fzTWuWxIevH_yG68szdlKaVaDB9-2z9_u7yegxehk_PI1uXyIrpN5GaMBqKzNEJRMpTGy0FWBVRlNTltZkhbClSmKaFhYKgRpJp0KrUoNI0BSiz4aH3rV3m5bCNq-rYGm1Mg25NuSYqkQrBSA69OIXunCtb7rvcpTdFFqJRHUUHijrXQieynztq9r4zxwh302d_5m6y8SHTOjYZkb-R_O_oS8npXzq</recordid><startdate>20130701</startdate><enddate>20130701</enddate><creator>Rodkin, M. 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b
-value and in the rate of main shocks. The space-time regions that involved precursory activation were nearly identical with the predictive phenomena that were previously detected by A.A. Lyubushin from an analysis of seismic noise based on data from the Japanese F-net. We discovered a previously unknown effect of correlation between the number of main shocks and the
b
-value. Both the ordinary foreshock activation and the longer weaker tendency, which consist in a precursory increase in the seismicity rate, were identified in the vicinities of
M
≈ 7 Japanese earthquakes (similarly to the seismicity in the Generalized Vicinities of large earthquakes based on worldwide data).</abstract><cop>Boston</cop><pub>Springer US</pub><doi>10.1134/S0742046313030056</doi><tpages>9</tpages></addata></record> |
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| ispartof | Journal of volcanology and seismology, 2013-07, Vol.7 (4), p.243-251 |
| issn | 0742-0463 1819-7108 |
| language | eng |
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| source | Springer Nature - Complete Springer Journals |
| subjects | Earth and Environmental Science Earth Sciences Earthquakes Geochemistry Geology Geophysics/Geodesy Seismic activity |
| title | On the seismic regime of the Japan region before the Tohoku mega-earthquake (Mw = 9) |
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