Seismic Activity in Eastern Tottori Prefecture and Surrounding Regions

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  • 鳥取県東部及びその周辺の地震活動について
  • トットリケン トウブ オヨビ ソノ シュウヘン ノ ジシン カツドウ ニ ツイテ

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Abstract

In the San'in district we have great earthquakes, and has been active recently for the past two decades. And a migration of seismic activity has been advancing from east to west along the Japan Sea coast since 1983. On analysis of these fault plane solutions, it is determined that their origin faults are left-lateral strike slip types directed SW-NW. These cross conjugate to the active seismic zone trend of the Japan Sea coast.However the active pattern in 1994 near the Yumura fault of the northwest part of Hyogo prefecture, is not what it was before. It has changed from left to right-lateral slip in the San'in district, and a migration of seismic activity along the Yumura fault occurred from NE to SW. In addition, the tectonic stress acting in this area changed to E-W direction on May 1994. These phenomena are estimated to be some precursors of the Southern Hyogo Earthquake.

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