兵庫県南部地震により出現した横尾山地震断層

概要

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Nojima fault in Awaji island emerged as an earthquake fault in Hyogoken-nambu earthquake with more than 8 km in length. On the other hand an opinion prenominates that there is no earthquake fault in Kobe district. The author pointed out later that some failures took place along Yokooyama fault in the earthquake. Now it is revealed that a dislocation happened in a tunnel at a point just crossing the fault at 80 m covering depth. The earthquake fault is normal one with right strike slip and coresponding to various geodetic measurement data, but not connect directly to the source fault. It should be determined that Yokooyama fault is a so-called sub-earthquake fault, one of the various modes.
1997-02-10