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Paleoseismological study for the Katata Fault, southern part of the Biwako-seigan active fault system, Kinki District



Paleoseismological study for the Katata Fault, southern part of the Biwako-seigan active fault system, Kinki District



Annual Report on Active Fault and Paleoearthquake Researches 2(Pages 91-107



We carried out arrayed drilling and diatom analysis of cores from the 60-km-long Biwako-seigan active fault system, one of the most active reverse faults in the Kinki district, in order to reveal the faulting history. The Katata fault is a southern component of the fault system located along the western coast of Lake Biwa. The arrayed drilling, made across the flexure zone in the Mano area, has shown that the flexure of the Katata fault occurred between ca. 4700 yBP and 30000 yBP. The diatom analysis of cores from the Katata area, where the subsidence rate is the highest, revealed that relative lake-level rose around 2000-2100 yBP and between ca. 3600 and 6500 yBP. It also showed that the 6500 yBP strand-line elevation at Katata was lower than that of the eastern coast of Lake Biwa, and the ca. 2000 yBP strand line at Katata was almost the same as the recent shoreline. These suggest that the west-tilting monoclinal movement around Lake Biwa and the associated subsidence of the western shore resulted in the two lake-level rise events in the Holocene. No faulting has occurred on the Katata fault, as a result of the monoclinal movement, since the last lake-level rise ca. 2000 yBP. Several other studies, such as sonic profiling of the Hira-oki fault or archaeoseismologic studies around Lake Biwa, have shown the ca. 2000 yBP faulting event on the southern Biwako-seigan active fault system. No geologic data have been found to indicate the fault activity during the 1662 Kambun earthquake.

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