A Proposal of New Interpretation of Spatio-temporal Variation in Seismicity and its Application to Plate Interface East off NE Japan

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  • YABE Yasuo
    Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University

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  • 地震活動の時空間変動に対する新たな解釈の提案と東北日本太平洋下プレート境界への適用
  • ジシン カツドウ ノ ジクウカン ヘンドウ ニ タイスル アラタ ナ カイシャク ノ テイアン ト トウホク ニホン タイヘイヨウ カ プレート キョウカイ エ ノ テキヨウ

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Abstract

New interpretation of spatio-temporal variations in b-value is proposed based on the laboratory observations. The spatio-temporal variations in b-value, which have been related to stress state by the ordinary interpretation, are translated to frictional properties of a fault. The new interpretation is as follows; (1) a linear increase in b-value with cumulative displacement breaks down at a transition displacement where frictional property changes from velocity hardening to velocity weakening. (2) The rate-dependence parameter of b-value has the opposite sign to that of friction. The new interpretation is applied to the shallow seismicity in subduction zone east-off NE Japan under the assumption that it is generated on the plate interface. The inferred distribution of frictional properties is generally consistent with both distributions of coseismic slips for the past large earthquakes and slip deficits in this region, showing validity of the interpretation. This study involves the importance of monitoring seismicity to elucidate mechanical properties of faults.

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