Tectonic Landform and Holocene Faulting History of the Sekidosan Fault along the Southeastern Margin of the Ouchigata Plain, Central Japan

• SUGITO Nobuhiko

  Department of Geophysics, Graduate School of Science, Kyoto University

• TSUTSUMI Hiroyuki

  Department of Geophysics, Graduate School of Science, Kyoto University

Bibliographic Information

Other Title

• 邑知潟平野南東縁・石動山断層の断層変位地形と完新世における断層活動史
• オウチガタ ヘイヤ ナントウエン セキドウサン ダンソウ ノ ダンソウ ヘンイ チケイ ト カンシン セイ ニ オケル ダンソウ カツドウシ

Abstract

The Sekidosan fault is a northeast-trending, 33-km-long active reverse fault located along the southeastern margin of the Ouchigata Plain, an elongated tectonic lowland whose northwestern and southeastern sides are bounded by reverse faults. We re-examined precise locations of the surface traces of the Sekidosan fault by interpreting large-scale aerial photographs, and then carried out topographic profiling across the tectonic scarps. Among the 34 profiles, 15 profiles are interpreted to represent the vertical offset associated with the most recent surface-faulting event, which enable us to reconstruct the vertical slip distribution during the most recent surface-faulting event along the middle and northeastern parts of the Sekidosan fault. The amount of vertical offset along the middle part is fairly constant (23 m) along the trace. In contrast, the amount of vertical offset along the northeastern part is smaller (12 m) and tapers off toward the northeastern end. In addition, the amount of vertical offset along other 10 profiles nearly equals to twice the amount of vertical offset during the most recent surface-faulting event, indicating that the amount of offset at individual sites along the middle and northeastern parts of the Sekidosan fault was almost the same during the latest and penultimate surface-faulting events. Subsurface geologic structures and radiocarbon ages obtained by a drilling survey at Nakagawa-Udono site, Hakui City, suggest that a surface-faulting event occurred between 6000 and 4000 years B.P. and this event probably occurred at approximately 4000 years B.P.

Journal

• Journal of Geography (Chigaku Zasshi)

  Journal of Geography (Chigaku Zasshi) 114 (1), 21-40, 2005

  Tokyo Geographical Society

Keywords

• tectonic landform
• paleoseismicity
• active fault
• characteristic earthquake model
• Sekidosan fault
• slip distribution
• timing of surface-faulting event
• Holocene

Details

• CRID: 1390282679205814784
• NII Article ID: 10017473615
• NII Book ID: AN00322536
• DOI: 10.5026/jgeography.114.21
• ISSN: 18840884
• ISSN: 0022135X
• NDL BIB ID: 7316005
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7316005
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed