On the latest paleoseismic event of the Hanaori fault near Kyoto, central Japan

概要

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The Hanaori fault is a large fault that extends NNE-SSW for about 50km from Imazu to Kyoto, in central Japan. Generally, it is well known that the most of Hanaori fault is active in late Quaternary time with right-lateral slip, but its history of recent faulting events does not become clear yet. So we excavated this fault at Tochudani, west of Imazu. As a result, it became clear that the Hanaori fault had displaced surely in historic time. Its age is after A. D.875-1028 year, the early Heian period. It is estimated that this is the latest faulting event of the Hanaori fault and the rightlateral displacement of at least 3.5 m occurred dring the event. The 1185 Bunji earthquake of M 7.4or the 1662 Kanbun earthquake of M 7<SUB>1/4</SUB>-7.6, both of which are known as big historical earthquakes that gave disaster of extreme severity to Kyoto, has possibility to be identified this Hanaori's faulting event.
Japanese Society for Active Fault Studiesの論文