Finding of some outcrops of the Otake fault in the Iwakuni active fault system
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概要
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Some outcrops of the Otake fault in the Iwakuni Active fault System, where the Otake fault cuts Quaternary gravel beds, were first found. The gravel beds are presumably estimated as late Pleistocene sediments from their facies and relative heights. According to the direction of striations on the fault plane, the latest movement of the Otake fault may have been right lateral slip having the component of a reverse fault. On the other hand, micro earthquakes recently occur around the north of the Otake fault and their focal mechanisms show nodal planes of NE-SW and NNW-SSE directions. The nodal planes of NE-SW direction correspond to the plane of the Otake fault. Although this does not immediately imply that the Otake fault is now active, further observations are necessary.
- Japanese Society for Active Fault Studiesの論文