Deep seismic reflection profiling across the Northern Fossa Magna:The ERI 1997 and the JNOC 1996 seismic lines, active faults and geological structures

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概要

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• The Northern Fossa Magna is a Miocene failed rift and due to subsequent shortening, its basin-fill forms a fold-belt associated with active faults. Seismic reflection data across the middle part of the northern Fossa Magna acquired in late 1990s were reprocessed to reveal the deep geometry of active faults. The reprocessed seismic sections portray the folded and faulted structure of the Neogene basin-fill. The deeper extension of the Western Nagano Basin active Fault (WNBF), which has been revealed for the first time, can be traced down to 4 km, as a reverse fault dipping 40° westward. In the western part, the Itoigawa-Shizuoka Tectonic Line (ISTL) active fault is presented as an emergent thrust dipping 30-35° eastward. Based on the seismic profiles, surface geology and well data, the balanced geologic cross section was constructed. Using simple-shear model of the basin formation, the total amount of Miocene extension is calculated to be ca. 27 km and the total amount of late Neogene to Quaternary shortening is ca. 11 km. The basin formation and shortening deformation are well explained by the tectonic inversion model and fault reactivation.

• 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

• TAKEDA Tetsuya

  Earthquake Research Institute, University of Tokyo

• KAWASAKI Shinji

  JGI Inc.

• Elouai Driss

  Department Of Earth And Planetary Systems Science Hiroshima University

• Hirata Naoshi

  Earthquake Research Institute The University Of Tokyo

• Takeshita Toru

  Department Of Earth And Planetary Systems Science Graduate School Of Science Hiroshima University

• Kato Naoko

  Earthquake Research Institute The University Of Tokyo

• Sato Hiroshi

  Earthquake Research Institute The University Of Tokyo

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