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Crustal heterogeneity around the Nagamachi-Rifu fault, northeastern Japan, as inferred from travel-time tomography

Earth, Planets and Space volume 58, pages 843–853 (2006)Cite this article

Abstract

An M=5 earthquake occurred on September 15, 1998, in the Nagamachi-Rifu fault (NRF), northeastern Japan. In the aftermath of this event, many seismograph stations were constructed temporarily around the fault, forming a dense network of stations with a spatial separation of 5 km. We report here our estimation of the three-dimensional velocity structures of the P and S waves using arrival-time data recorded at these stations with the aim of understanding the heterogeneous structure around the NRF. Low-Velocity and high Poisson’s ratio anomalies are imaged in the lower crust beneath the volcanic area, which are probably associated with the partially molten materials conveyed through the upwelling flow in the mantle wedge. A distinct low-velocity anomaly, which is explainable by the existence of H2O-filled pores, is observed in the mid crust at the deeper extension of the NRF. Two low-velocity anomalies that are probably associated with the remnants of magmatic activity that formed the Shirasawa caldera and with the existence of thick late-Cenozoic sedimentary layers are observed at depths shallower than 10 km in the hanging wall of the NRF. Our results successfully characterize the major features of the complex velocity structure around the NRF, with implications for the existence of fluid-rich regions in the mid to lower crust.

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Authors and Affiliations

  1. Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan

    Junichi Nakajima, Akira Hasegawa & Norihito Umino

  2. National Research Institute for Earth Science and Disaster Prevention, 3-1 Tennodai, Tsukuba-shi, 305, Japan

    Shigeki Horiuchi

  3. Graduate School of Integrated Science, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, 236-0027, Japan

    Kazuo Yoshimoto

  4. Institute of Mineralogy, Petrology and Economic Geology, Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan

    Takeyoshi Yoshida

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  1. Junichi Nakajima
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  2. Akira Hasegawa
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  3. Shigeki Horiuchi
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  4. Kazuo Yoshimoto
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  5. Takeyoshi Yoshida
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  6. Norihito Umino
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Correspondence to Junichi Nakajima.

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Nakajima, J., Hasegawa, A., Horiuchi, S. et al. Crustal heterogeneity around the Nagamachi-Rifu fault, northeastern Japan, as inferred from travel-time tomography. Earth Planet Sp 58, 843–853 (2006). https://doi.org/10.1186/BF03351989

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