Geologic fault model based on the high-resolution seismic reflection profile and aftershock distribution associated with the 2004 Mid-Niigata Prefecture earthquake (M6.8), central Japan

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概要

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• The Mid-Niigata Prefecture earthquake in 2004 (M<SUB>JMA</SUB> 6.8) generated surface ruptures along the eastern rim of the Uonuma Hills. To elucidate the structural linkage between the surface ruptures and the source fault at depth, the high-resolution seismic reflection profile across the surface ruptures and nearby active faults, and the data of aftershock distribution are examined. The 5.2-km-long, high-resolution, depth-converted seismic section reveals an emergent thrust beneath the surface ruptures. A two-dimensional model of the fault geometry has been constructed based on the aftershock distribution and the shallow reflection profile. The development of the main geologic structure are well explained by forward modeling using a balanced cross-section method. In detail, the fault system generated the main shock dips at a steep angle (60°) below 5 km depth and more shallowly (30°) near the surface.

• 公益社団法人 日本地震学会、地球電磁気・地球惑星圏学会 、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会の論文

著者

• Abe Shintaro

  Central Research Institute Of Electric Power Industry

• Ito Tanio

  Department Of Earth Sciences Chiba University

• Toda Shigeru

  Aichi University Of Education

• Koshiya Shin

  Department Of Civil And Environmental Engineering Iwate University

• Ogino Sumiko

  Earthquake Research Institute University Of Tokyo

• Echigo Tomoo

  Department Of Earth And Planetary Science University Of Tokyo

• Tateishi Masaaki

  Department Of Geology And Earth Material Science Niigata University

• Kato Hajime

  Faculty Of Education And Human Sciences Yamanashi University

• Toyoshima Tsuyoshi

  Graduate School Of Science And Technology Earth Science Niigata University

• Kato Naoko

  Earthquake Research Institute The University Of Tokyo

• Sato Hiroshi

  Earthquake Research Institute The University Of Tokyo

• Imaizumi Toshifumi

  Department of GeoEnvironmental Science, Tohoku Univ.

• TATEISHI Masaaki

  Department of Geology and Earth Material Science, Niigata University

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