Holocene activity of the Kakuda-Yahiko fault in the western margin of the Niigata Plain, based on sediment core analysis

DOI Web Site 2 Citations
  • Nakanishi Toshimichi
    Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology
  • Miyachi Yoshinori
    Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology
  • Tanabe Susumu
    Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology
  • Urabe Atsushi
    Research Center for Natural Hazards and Disaster Recovery, Niigata University
  • Yasui Satoshi
    Koka Jiban Survey Co. Ltd.
  • Wakabayashi Toru
    Graduate School of Frontier Sciences, the University of Tokyo

Bibliographic Information

Other Title
  • ボーリングコア解析による新潟平野西縁，角田・弥彦断層の完新世における活動度
  • ボーリングコア カイセキ ニ ヨル ニイガタ ヘイヤ セイエン カクダ ヤヒコダンソウ ノ カンシン セイ ニ オケル カツドウド

Search this article

Abstract

The Kakuda-Yahiko fault is a west-dipping blind thrust along the western margin of the Niigata plain, central Japan. The slip rate has not clearly estimated because the fault is buried under thick sediments. We obtained and analyzed three core samples (GS-KNM-1, GS-SGT-1, and AK-1) crossing the fault, and we recognized the Holocene vertical movement on the basis of correlation of detailed description, radiocarbon ages, and diatom assemblages. Based on these analyses, we interpreted nine sedimentary facies: the late Pleistocene marine sediments, meandering river sediments, salt to freshwater marsh sediments, offshore sediments, lower and upper shoreface sediments, foreshore sediments, modern river sediments, dune sediments, and surface soils, in ascending order. The average vertical-slip rate is estimated 3.6-4.6 mm/yr based on the vertical-offsets of the ravinement surface dated 9.4-8.2 cal kyr BP and the pumice layer dated 6-5 cal kyr BP. However, this slip rate might contain at best 1.3 mm/yr compaction effects of unconsolidated muddy sediments. Therefore, the average vertical-slip rate of Kakuda-Yahiko fault would be estimated about 3 mm/yr.

Journal

  • Active Fault Research

    Active Fault Research 2010 (32), 9-25, 2010

    Japanese Society for Active Fault Studies

Citations (2)*help

See more

Related Projects

See more

Keywords

Details 詳細情報について

Report a problem

Back to top