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Book Chapter

Three-dimensional plate geometry and P-wave velocity models of the subduction zone in SW Japan: Implications for seismogenesis

By
Ayako Nakanishi
Ayako Nakanishi
Research and Development Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology, Yokohama Institute of Earth Science, 3173-25, Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan
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Narumi Takahashi
Narumi Takahashi
Earthquake and Tsunami Research Division, National Research Institute for Earth Science and Disaster Resilience, 3-1 Tennodai, Tsukuba, Ibaraki 305-0006, Japan
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Yojiro Yamamoto
Yojiro Yamamoto
Research and Development Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology, Yokohama Institute of Earth Science, 3173-25, Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan
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Tsutomu Takahashi
Tsutomu Takahashi
Research and Development Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology, Yokohama Institute of Earth Science, 3173-25, Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan
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Seckin Ozgur Citak
Seckin Ozgur Citak
Research and Development Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology, Yokohama Institute of Earth Science, 3173-25, Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan
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Takeshi Nakamura
Takeshi Nakamura
Earthquake and Tsunami Research Division, National Research Institute for Earth Science and Disaster Resilience, 3-1 Tennodai, Tsukuba, Ibaraki 305-0006, Japan
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Koichiro Obana
Koichiro Obana
Earthquake and Tsunami Research Division, National Research Institute for Earth Science and Disaster Resilience, 3-1 Tennodai, Tsukuba, Ibaraki 305-0006, Japan
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Shuichi Kodaira
Shuichi Kodaira
Earthquake and Tsunami Research Division, National Research Institute for Earth Science and Disaster Resilience, 3-1 Tennodai, Tsukuba, Ibaraki 305-0006, Japan
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Yoshiyuki Kaneda
Yoshiyuki Kaneda
Institute of Education, Research and Regional Cooperation for Crisis Management Shikoku, Kagawa University, Hayashi-cho 2217-20, Takamatsu, Kagawa 761-0396, Japan
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Publication history
25 September 201714 March 2018

ABSTRACT

To accurately estimate the coseismic rupture area in a Nankai megathrust earthquake and predict seismic and tsunami hazards, various three-dimensional models of the subducting plate geometry and simple seismic velocity models of the subduction zone in SW Japan have been proposed. However, to ensure consistency among studies, more realistic and reliable standard models must be developed. Here, we use wide-angle ocean-bottom seismographic survey results to develop models of the three-dimensional geometry of the subducting plate and of the three-dimensional P-wave velocity structure around the Nankai Trough. We confirmed the reliability of the proposed models by comparing theoretical first arrivals, calculated from two-dimensional structure models sampled from the three-dimensional model along seismic profile lines, with observed traveltime data. The proposed models are the first to be visible and to attempt to represent the actual seismic velocity structures around the entire Nankai Trough in SW Japan. Although the spatial validity of the three-dimensional velocity structure model could not be strictly evaluated, we confirmed that the differences between hypocenter parameters determined from previously published seismic tomography results and those obtained by using our three-dimensional structure model were sufficiently small (latitude and longitude within ±0.1 ° and depth within approximately ±5 km). Therefore, our three-dimensional structure model is suitable for use as an initial model for hypocenter determination.

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Contents

GSA Special Papers

Geology and Tectonics of Subduction Zones: A Tribute to Gaku Kimura

Geological Society of America
Volume
534
ISBN electronic:
9780813795348

GeoRef

References

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