Seismic imaging and velocity structure around the JFAST drill site in the Japan Trench: low Vp, high Vp/Vs in the transparent frontal prism

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• 作者：Yasuyuki Nakamura ; Shuichi Kodaira ; Becky J Cook…
• 关键词：Japan Trench ; Seismic image ; P and S wave velocities ; JFAST
• 刊名：Earth, Planets and Space
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：66
• 期：1
• 全文大小：4770KB
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• 作者单位：Yasuyuki Nakamura (31) (32)
  Shuichi Kodaira (31) (32)
  Becky J Cook (33)
  Tamara Jeppson (34)
  Takafumi Kasaya (35) (36)
  Yojiro Yamamoto (31) (32)
  Yoshitaka Hashimoto (37)
  Mika Yamaguchi (37) (38)
  Koichiro Obana (31) (32)
  Gou Fujie (31) (32)
  
  31. Institute for Research on Earth Evolution (IFREE), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa, 236-0001, Japan
  32. Research and Development Center for Earthquake and Tsunami (CEAT), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 3173-25 Showa-machi, Kanazawa-ku, Yokohama, Kanagawa, 236-0001, Japan
  33. National Oceanography Centre, Southampton (NOCS), University of Southampton, Waterfront Campus, European Way, Southampton, SO14 3ZH, United Kingdom
  34. Department of Geoscience, University of Wisconsin-Madison, 1215 West Dayton Street, Madison, WI, 53706, USA
  35. Institute for Research on Earth Evolution (IFREE), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan
  36. Research and Development Center for Earthquake and Tsunami (CEAT), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan
  37. Department of Applied Science, Faculty of Science, Kochi University, Akebonocyo 2-5-1, Kochi, 780-8520, Japan
  38. Marine Works Japan Ltd, 3-54-1 Oppamahigashi, Yokosuka, Kanagawa, 237-0063, Japan
  
• 刊物类别：Earth Sciences, general; Geology; Geophysics/Geodesy;
• 刊物主题：Earth Sciences, general; Geology; Geophysics/Geodesy;
• 出版者：Springer Berlin Heidelberg
• ISSN：1880-5981

文摘

Seismic image and velocity models were obtained from a newly conducted seismic survey around the Integrated Ocean Drilling Program (IODP) Japan Trench Fast Drilling Project (JFAST) drill site in the Japan Trench. Pre-stack depth migration (PSDM) analysis was applied to the multichannel seismic reflection data to produce an accurate depth seismic profile together with a P wave velocity model along a line that crosses the JFAST site location. The seismic profile images the subduction zone at a regional scale. The frontal prism where the drill site is located corresponds to a typically seismically transparent (or chaotic) zone with several landward-dipping semi-continuous reflections. The boundary between the Cretaceous backstop and the frontal prism is marked by a prominent landward-dipping reflection. The P wave velocity model derived from the PSDM analysis shows low velocity in the frontal prism and velocity reversal across the backstop interface. The PSDM velocity model around the drill site is similar to the P wave velocity model calculated from the ocean bottom seismograph (OBS) data and agrees with the P wave velocities measured from the core experiments. The average Vp/Vs in the hanging wall sediments around the drill site, as derived from OBS data, is significantly larger than that obtained from core sample measurements. Keywords Japan Trench Seismic image P and S wave velocities JFAST