Fault outcrop at Neppu Genya in Kuromatsunai Lowland fault zone, southwest Hokkaido

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  • 黒松内低地断層帯・熱郛原野の断層露頭
  • クロマツ ナイ テイチ ダンソウタイ ・ ネツフゲンヤ ノ ダンソウ ロトウ

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Description

The Kuromatsunai Lowland fault zone is a 32 km-long, reverse fault zone which develops through the Kuromatsunai Lowland, southwest Hokkaido. This is a complexed fault zone consists of a series of reverse faults trending approximately north–south. Individual faults are 3-4 km and displace middle to late Quaternary terrace surfaces and deposit, the west side raising up. We observed a fault outcrop of one of the reverse faults in the Kuromatsunai Lowland. The outcrop on the Babasawa River exposes Lower Pleistocene sediments that are thrusting over the youngest sediment along the F1 fault. Tephra analyses and radiocarbon dates indicate at least two seismic events. One is between 10 C and 17 C AD, and another is about 20 ka. The younger event is not associated with any of the known paleoseismic events from the Warabitai fault in south. Therefore, the F1 fault and Warabitai fault did not move simultaneously. The layer III of the Late Glacial age is displaced vertically 1.6 m by the F1 fault yielding the vertical component of net slip to be about 0.08 mm/yr.

Journal

  • Active Fault Research

    Active Fault Research 2013 (38), 17-28, 2013

    Japanese Society for Active Fault Studies

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