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Active deformation of Sagami Bay triggered by approach of the Izu island arc

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Abstract

Sagami Bay in central Japan is known as the seismogenic and tsunamigenic zone of the 1703 and 1923 Kanto earthquakes that caused devastating damage in the Tokyo metropolitan area. However, the tsunamigenic structure within the frontal wedges of the subduction zone remains unresolved after the last disastrous events. In the present study, the detailed structural features of the shallowest structure of the Sagami Tectonic Line in Sagami Bay were revealed by seismic reflection, a deep-towed high-resolution sub-bottom profiler, and swath bathymetry data. Based on our data, the middle segments of the Sagami Tectonic Line, which is distributed along the southwestern rim of the Miura Knoll, are considered highly likely to be an active fault that has been a repeatedly active feature. The trough-fill sediments of the south Sagami Bay are currently thought to be actively deformed by the compressive stress accompanying northwestward subduction of the tip of Izu-Ogasawara (Bonin) Arc crust on the Philippine Sea plate.

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Acknowledgments

The authors would like to thank the captain, crew, technicians, and onboard scientists of the KY05-06 (R/V Kaiyo), KY06-01 (R/V Kaiyo), and KH-10-5 cruises (R/V Hakuho-Maru). The authors would also like to acknowledge the constructive reviews by the two anonymous reviewers, and the helpful editorial comments by Prof. G. Uenzelmann-Neben. We would like to thank Dr. C. Conway, Dr. J.H. Chang, Dr. H. Tokuyama, and Dr. Y. Misawa for their discussion and comments. We would also like to thank Dr. Y. Kido for her cooperation in using bathymetric data in the Sagami Bay. The authors used the Generic Mapping Tools (GMT) software by Wessel and Smith (1991) to constrict the figures.

Funding

This work was supported in part by JSPS KAKENHI Grant Number 19H01978.

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Authors and Affiliations

  1. Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan

    Ayanori Misawa & Mikiya Yamashita

  2. Atmosphere and Ocean Research Institute, The University of Tokyo, Tokyo, Japan

    Juichiro Ashi

  3. JGI, Inc., Tokyo, Japan

    Kenji Tara

  4. Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan

    Mikiya Yamashita & Masataka Kinoshita

  5. Earthquake Research Institute, The University of Tokyo, Tokyo, Japan

    Masataka Kinoshita

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  1. Ayanori Misawa
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  2. Juichiro Ashi
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  5. Masataka Kinoshita
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Correspondence to Ayanori Misawa.

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Misawa, A., Ashi, J., Tara, K. et al. Active deformation of Sagami Bay triggered by approach of the Izu island arc. Geo-Mar Lett 40, 741–753 (2020). https://doi.org/10.1007/s00367-020-00668-2

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