Inland Earthquakes Preceded the Interplate Earthquakes in Hyuga-nada, Kyushu, Japan.

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  • YAMAOKA Koshun
    Research Center for Seismology and Volcanology, Graduate School of Science, Nagoya University
  • CHUREI Masaaki
    Japan Meteorological Agency
  • ANDO Masataka
    Research Center for Seismology and Volcanology, Graduate School of Science, Nagoya University

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Other Title
  • 日向灘の地震に先立つ九州内陸の地震
  • ヒュウガナダ ノ ジシン ニ サキダツ キュウシュウ ナイリク ノ ジシン

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Abstract

The temporal relationship between the interplate and inland earthquakes of Kyushu Island region was investigated. We analyzed this relationship by stacking the temporal frequency of the inland earthquakes with reference to the occurrence time of each major interplate earthquake in the Hyuga-nada region, that occurred between 1900 and 2000. A good coincidence of occurrence between the inland and the interplate earthquakes is recognized. While the tendency of the occurrence after the interplate events has already been pointed out, we found that the inland earthquakes also tend to occur before the interplate events. Abrupt activation of the inland earthquakes within several months before major interplate earthquakes is recognized in addition to the tendency to occurr afterwards. The preceding inland earthquakes may indicate that they are triggered by precursory slow slips around the hypocenters of the Hyuga-nada earthquakes.

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