Origin of the active fault cutting marine terraces and its paleoenvironmental and paleoseismological significance.

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In order to discuss the origin of isolated active faults which located on the marine terraces with short length, author investigated the geomorphic feature, tectonics, geological structure, and seismicity of those active faults. The result shows that those active faults are distinguished into two types ; 1. a back-thrust of the large thrust fault which is located in the off coast, and 2. the reactivated old geological structure parallel to the coast line which was stimulated by the strong motion of distant event or the change of environmental condition. It is not easy to think about the possibility of both types of fault acting as seismogenic fault.