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

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.

References

  • Active Fault Research Group, Active Faults in Japan, revised ed., University of Tokyo Press, Tokyo, 437 pp., 1991.

    Google Scholar 

  • Chen, C., W. Wang, and T. Teng, 3D velocity structure around the source area of the 1999 Chi-Chi, Taiwan, earthquake: before and after the main shock, Bull. Seismol. Soc. Am., 91, 1013–1027, 2001.

    Article  Google Scholar 

  • Christensen, N. I., Poisson’s ratio and crustal seismology, J. Geophys. Res., 101, 3139–3156., 1996.

    Article  Google Scholar 

  • Christensen, N. I. and W. D. Mooney, Seismic velocity structure and composition of the continental crust: A global view, J. Geophys. Res., 100, 9761–9788, 1995.

    Article  Google Scholar 

  • DeMets, C., R. G. Gordon, D. F. Argus, and S. Stein, Effect of recent revisions to the geomagnetic reversal time scale on estimates of current plate motions, Geophys. Res. Lett., 21, 2191–2194, 1994.

    Article  Google Scholar 

  • Geological Survey of Japan, Geologic Atlas of Japan, Asakura Publishing Company, Ltd., Tokyo, 140 pp., 1992.

    Google Scholar 

  • Hasegawa, A. and J. Nakajima, Geophysical constraints on slab subduction and arc magmatism, in The State of the Planet: Frontiers and Challenges in Geophysics, Geophys. Monogr. Ser., vol. 150, pp. 81–94, AGU, Washington, D.C., 2004.

    Google Scholar 

  • Hasegawa, A., D. Zhao, S. Hori, A. Yamamoto, and S. Horiuchi, Deep structure of the northeastern Japan arc and its relationship to seismic and volcanic activity, Nature, 352, 683–689, 1991.

    Article  Google Scholar 

  • Hasegawa, A., S. Horiuchi, and N. Umino, Seismic structure of the northeastern Japan convergent margin: A synthesis, J. Geophys. Res., 99, 22295–22311, 1994.

    Article  Google Scholar 

  • Hasegawa, A., A. Yamamoto, N. Umino, S. Miura, S. Horiuchi, D. Zhao, and H. Sato, Seismic activity and deformation process of the overriding plate in the northeastern Japan subduction zone, Tectonophysics, 319, 225–239, 2000.

    Article  Google Scholar 

  • Hasegawa, A., H. Ito, T. Iwasaki, and T. Ikawa, Deep structure of NRF as inferred from seismic expeditions, the Proceedings of the International Symposium on Slip and Flow Processes in and Below Seismogenic Region, 67–72, 2001.

    Google Scholar 

  • Hasegawa, A., J. Nakajima, N. Umino, and S. Miura, Deep structure of the northeastern Japan arc and its implications for crustal deformation and shallow seismic activity, Tectonophysics, 403, 59–75, 2005.

    Article  Google Scholar 

  • Hori, S., N. Umino, T. Kono, and A. Hasegawa, Distinct S-wave reflectors (bright spots) extensively distributed in the crust and upper mantle beneath the northeastern Japan arc, J. Seismol. Soc. Jpn., 56, 435–446, 2004.

    Google Scholar 

  • Horiuchi, S., H. Negishi, J. Uchida, M. Kuchiishi, N. Umino, T. Matsuzawa, T. Okada, A. Hasegawa, K. Yoshimoto, Development of high sampling frequency seismic observation system, J. Seismol. Soc. Jpn., 55, 217–222, 2002 (in Japanese).

    Google Scholar 

  • Iio, Y. and Y. Kobayashi, Is the plastic flow uniformly distributed below the seismogenic region?, Tectonophysics, 364, 43–53, 2003.

    Article  Google Scholar 

  • Iio, Y., T. Sagiya, and Y. Kobayashi, What controls the occurrence of shallow intraplate earthquakes?, Earth Planets Space, 56, 1077–1086, 2004a.

    Article  Google Scholar 

  • Iio, Y., T. Sagiya, N. Umino, T. Nishimura, K. Takahashi, and T. Homma, A comprehensive model of the deformation process in the Nagamachi-Rifu Fault Zone, Earth Planets Space, 56, 1339–1345, 2004b.

    Article  Google Scholar 

  • Ikawa, T., T. Kawanaka, S. Kawasaki, A. Hasegawa, N. Umino, A Nakamura, H. Ito, T. Iwasaki, and H. Sato, Seismic reflection survey of the deep structure of Nagamachi-Rifu fault, northeastern Japan, Proceedings of international symposium on slip and flow process in and below the seismogenic region, 44, 2001.

  • Imanishi, K., H. Ito, Y. Kuwahara, Y. Maeda, T. Yokokura, N. Kano, K. Yamaguchi, and A. Tanaka, Deep structure of the Nagamachi-Rifu fault deduced from small aperture seismic array observation, Earth Planets Space, 54, 1033–1038, 2002.

    Article  Google Scholar 

  • Ito, H., Outline of the comprehensive joint research on the modeling of slip process of earthquake source fault and plastic flow below the seismogenic region, the Proceedings of the International Symposium on Slip and Flow Processes in and Below Seismogenic Region, 9–10, 2001.

    Google Scholar 

  • Ji, S., Q. Wang, and B. Xia, Handbook of Seismic Properties of Minerals, Rocks, and Ores, Polytechnique International Press, 630 pp., 2002.

    Google Scholar 

  • Johnson, P. and T. McEvilly, Parkfield seismicity: Fluid driven?, J. Geophys. Res., 100, 12937–12950, 1995.

    Article  Google Scholar 

  • Komazawa, M. and M. Mishina, Caldera structure inferred from gravity anomalies west of Nagamachi-Rifu Fault, Northeast Japan, Earth Planets Space, 54, 1049–1053, 2002.

    Article  Google Scholar 

  • Miyagi Prefectural Government, Research on the Nagamachi-Rifu fault, Abstract for the Results of active fault research supported by Headquarters for Earthquake Research Promotion, No. 1, The Science and Technology Agency, Japan, 30–34, 1997.

    Google Scholar 

  • Miyagi Prefectural Government, Research on the Nagamachi-Rifu fault, Abstract for the Results of active fault research supported by Headquarters for Earthquake Research Promotion, No. 2, The Science and Technology Agency, Japan, 29–34, 2000.

    Google Scholar 

  • Nakajima, J. and A. Hasegawa, Tomographic imaging of seismic velocity structure in and around the Onikobe volcanic area, northeastern Japan: implications for fluid distribution, J. Volcanol. Geotherm. Res., 127, 1–18, 2003.

    Article  Google Scholar 

  • Nakajima, J., T., Matsuzawa, A. Hasegawa, and D. Zhao, Three-dimensional structure of Vp, Vs and Vp/Vs beneath the northeastern Japan arc: Implications for arc magmatism and fluids, J. Geophys. Res., 106, 21843–21857, 2001a.

    Article  Google Scholar 

  • Nakajima, J., T., Matsuzawa, A. Hasegawa, and D. Zhao, Seismic imaging of arc magma and fluids under the central part of northeastern Japan, Tectonophysics, 341, 1–17, 2001b.

    Article  Google Scholar 

  • Nakajima, J., T. Matsuzawa, and A. Hasegawa, Moho depth variation in the central part of northeastern Japan estimated from reflected and converted waves, Phys. Earth Planet Inter., 130, 31–47, 2002.

    Article  Google Scholar 

  • Nakajima, J., Y. Takei, and A. Hasegawa, Quantitative analysis of the inclined low-velocity zone in the mantle wedge of northeastern Japan: A systematic change of melt-filled pore shapes with depth and its implications for melt migration, Earth Planet. Sci. Lett., 234, 59–70, 2005.

    Article  Google Scholar 

  • Nakamura, A., Y. Asano, and A. Hasegawa, Estimation of deep fault geometry of the Nagamachi-Rifu fault from seismic array observations, Earth Planets Space, 54, 1027–1031, 2002.

    Article  Google Scholar 

  • Nakamura, K., Inversion tectonics and its structural expression, J. Tectonic Res. Group Jpn., 38, 3–45, 1992 (in Japanese with English abstract).

    Google Scholar 

  • Nishimura, T., T. Sagiya, and S. Miura, Crustal deformation around the Nagamachi-Rifu fault zone and its vicinity (central Tohoku), northeastern Japan, observed by a continuous GPS network, J. Seismol. Soc. Jpn., 56, 497–509, 2004.

    Google Scholar 

  • Ogawa, Y., M. Mishina, Y. Honkura, K. Takahashi, and S. B. Tank, Electromagnetic imaging of the Nagamachi-Rifu fault and its deep extension, The Second International Symposium on Slip and Flow Processes in and below the Seismogenic Region, 2004.

    Google Scholar 

  • Okada, T., A study on characteristics of seismicity and asperities in the northeastern Japan arc, Doctoral Dissertation, Tohoku University, Sendai, Japan, 2003 (in Japanese).

    Google Scholar 

  • Okada, T., U. Umino, Y. Ito, T. Matsuzawa, A. Hasegawa, and M. Kamiyama, Source processes of 15 September 1998 M5.0 Sendai, northeastern Japan, earthquake and its M3.8 foreshock by waveform inversion, Bull. Seismol. Soc. Am., 91, 1607–1618, 2001.

    Article  Google Scholar 

  • Okada, T., N. Umino, T. Matsuzawa, J. Nakajima, N. Uchida, T. Nakayama, S. Hirahara, T. Sato, S. Hori, T. Kono, Y. Yabe, K. Ariyoshi, S. Gamage, J. Shimizu, J. Suganomata, S. Kita, S. Yui, M. Arao, S. Hondo, T. Mizukami, H. Tsushima, T. Yaginuma, A. Hasegawa, Y. Asano, H. Zhang, and C. Thurber, Aftershock distribution and 3D seismic velocity structure in and around the focal area of the 2004 mid Niigata prefecture earthquake obtained by applying double-difference tomography to dense temporary seismic network data, Earth Planets Space, 57, 435–440, 2005.

    Article  Google Scholar 

  • Okamura, Y., M. Watanabe, E. Morijiri, and M. Satoh, Rifting and basin inversion in the eastern margin of the Japan Sea, Island Arc, 4, 166–181, 1995.

    Article  Google Scholar 

  • Pervukhina, M., Y. Kuwahara, and H. Ito, Rock microstructure in the deep extension of the Nagamachi-Rifu fault revealed by analysis of collocated seismic and magnetotelluric data: Implication of strong deformation process, Earth Planets Space, 56, 1357–1368, 2004.

    Article  Google Scholar 

  • Sato, H., The relationship between late Cenozoic tectonic events and stress field and basin development in northeast Japan, J. Geophys. Res., 99, 22261–22274, 1994.

    Article  Google Scholar 

  • Sato, H., T. Imaizumi, T. Yoshida, H. Ito, and A. Hasegawa, Tectonic evolution and deep to shallow geometry of Nagamachi-Rifu active fault system, NE Japan, Earth Planets Space, 54, 1039–1043, 2002.

    Article  Google Scholar 

  • Takei, Y., Effect of pore geometry on Vp/Vs: From equilibrium geometry to crack, J. Geophys. Res., 107(B2), 2043, 2002.

    Article  Google Scholar 

  • Thurber, C. H., S. Roecker, K. Roberts, M. Gold, L. Powell, and K. Rittger, Earthquake locations and three-dimensional fault zone structure along the creeping section of the San Andreas fault near Parkfield, CA: Preparing for SAFOD, Geophys. Res. Lett., 30(3), 1112, 2003.

    Article  Google Scholar 

  • Umino, N., T. Okada, and A. Hasegawa, Foreshock and aftershock sequence of 1998 M5.0 Sendai, northeastern Japan, earthquake and its implications for earthquake nucleation, Bull. Seismol. Soc. Am., 92, 2465–2477, 2002a.

    Article  Google Scholar 

  • Umino, N., H. Ujikawa, S. Hori, and A. Hasegawa, Distinct S-wave reflectors (bright spots) detected beneath the Nagamachi-Rifu fault, NE Japan, Earth Planets Space, 54, 1021–1026, 2002b.

    Article  Google Scholar 

  • Wessel, P. and W. H. F. Smith, New, improved version of the Generic Mapping Tools released, EOS Trans. AGU, 79, 579, 1998.

    Article  Google Scholar 

  • Yoshida, T., The evolution of arc magmatism in the NE Honshu arc, Japan, Sci. Rep. Tohoku Univ., 36, 131–149, 2001.

    Google Scholar 

  • Yoshimoto, K., N. Uchida, H. Sato, M. Ohtake, N. Hirata, and K. Obara, Microseismicity around the Nagamachi-Rifu fault, Miyagi Prefecture, Northeastern Japan, J. Seismol. Soc. Jpn, 52, 407–416, 2000 (in Japanese with English abstract).

    Google Scholar 

  • Zhao, D., S. Horiuchi, and A. Hasegawa, 3-D seismic velocity structure of the crust and uppermost mantle in the northeastern Japan arc, Tectonophysics, 181, 135–149, 1990.

    Article  Google Scholar 

  • Zhao, D., A. Hasegawa, and S. Horiuchi, Tomographic imaging of P and S wave velocity structure beneath northeastern Japan, J. Geophys. Res., 97, 19909–19928, 1992.

    Article  Google Scholar 

  • Zhao, D., H. Kanamori, and H. Negishi, Tomography of the source area of the 1995 Kobe earthquake: evidence for fluids at the hypocenter?, Science, 274, 1891–1894, 1996.

    Article  Google Scholar 

  • Zhao, D., T. Matsuzawa, and A. Hasegawa, Morphology of the subducting slab boundary in the northeastern Japan arc, Phys. Earth Planet. Inter., 102, 89–102, 1997.

    Article  Google Scholar 

  • Zhao, D., H. Tani, and O. P. Mishra, Crustal heterogeneity in the 2000 Western Tottori earthquake region: effect of fluids from slab hydration, Phys. Earth Planet. Inter., 145, 161–177, 2004.

    Article  Google Scholar 

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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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  • DOI: https://doi.org/10.1186/BF03351989

Key words

  • seismic velocity structure
  • northeastern Japan
  • Nagamachi-Rifu fault
  • fluids
  • magma
  • caldera
  • active fault