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Subsurface structures derived from receiver function analysis and relation to hypocenter distributions in the region from the eastern Shikoku to the northern Chugoku districts, Southwest Japan

Abstract

We carried out receiver function imaging to estimate detailed configurations of the Philippine Sea (PHS) slab beneath the Shikoku and Chugoku districts and crustal structures in the region. We used two temporary seismic arrays with an average station spacing of about 10 km in the Chugoku district. Beneath Shikoku a clear northward dipping discontinuity at about 20–40 km depth was found, with other discontinuities below. We present a new interpretation that the clear boundary corresponds to the under surface of a low velocity layer in the upper part of the PHS slab. We also found a discontinuity at about 60 km depth beneath the Chugoku district, which is thought to be the aseismic PHS slab. Small scale discontinuities were found in the crust beneath the source area of the 2000 western Tottori Earthquake and around the Median Tectonic Line. The discontinuities might relate to the occurrence of large inland earthquakes.

References

  1. Ammon, C. J., The isolation of receiver effects form teleseismic P waveforms, Bull. Seismol. Soc. Am., 81, 2504–2510, 1991.

  2. Asano, Y. and A. Hasegawa, Imaging the fault zones of the 2000 western Tottori earthquake by a new inversion method to estimate three-dimensional distribution of the scattering coefficient, J. Geophys. Res., 109, B06306, doi:10. 1029/2003JB002761, 2004.

  3. Chevrot, S. and N. Girardin, On the detection and identification of converted and reflected phases from receiver functions, Geophys. J. Int., 141, 801–808, 2000.

  4. Doi, I., K. Nishigami, K. Tadokoro, and A. Shimokawa, Three Dimensional Distribution of S Wave Re flectors in and around the Source Region of the 2000 Western Tottori Earthquake, Earth Monthly, 25, 647–651, 2003 (in Japanese).

  5. Goto, H., T. Nakata, H. Tsutsumi, K. Okumura, T. Imaizumi, T. Nakamura, and T. Watanabe, The Latest Surface-Faulting Events on the Median Tectonic Line in Shikoku, Southwest Japan, Based on Mini-Trenching and Geoslicer Studies, Zisin 2 (J. Seismol. Soc. Jpn.), 53, 205–219, 2001 (in Japanese with English abstract).

  6. Gravity Research Group in Southwest Japan, Cravity database of southwest Japan [CD-ROM], Bull. Nagoya Univ. Museum Special Report, 9, Nagoya, Japan, 2001.

  7. Helmberger, D. V. and R. Wiggins, Upper mantle structure of midwestern Unites States, J. Geophys. Res., 76, 3229–3245, 1971.

  8. Ito, K., Seismogenic layer, reflective lower crust, surface heat flow and large inland earthquakes, Tectonophysics, 306, 423–433, 1999.

  9. Ito, T., T. Ikawa, S. Yamakita, and T. Maeda, Gently north-dipping Median Tectonic Line (MTL) revealed by recent seismic reflection studies, southwest Japan, Tectonophysics, 264, 51–63, 1996.

  10. Japanese University Group of the Joint Seismic Observation in the Southwestern Japan, The Joint Seismic Observations at the Southwestern Japan, Program. Abst., Seismol. Soc. Jpn., P004, 2002 (in Japanese)

  11. Katsumata, A. and N. Kamaya, Low-frequency continuous tremor around the Moho discontinuity away from volcanoes in the southwest Japan, Geophys. Res. Lett., 30, doi: 10.1029/2002GL015981, 2003.

  12. Kawamura, T., M. Onishi, E. Kurashimo, T. Ikawa, and T. Ito, Deep seismic reflection experimet using a dense receiver and sparse shot technique for imaging the deep structure of the Median Tectonic Line (MTL) in east Shikoku, Japan, Earth Planets Space, 55, 549–557, 2003.

  13. Kodaira, S., E. Kurashimo, J.-O. Park, N. Takahashi, A. Nakanishi, S. Miura, T. Iwasaki, N. Hirata, K. Ito, and Y. Kaneda, Structural factors controlling the rupture process of a megathrust earthquake at the Nankai trough seismogenic zone, Geophys. J. Int., 149, 815–835, 2002.

  14. Kurashimo, E., M. Tokunaga, N. Hirata, T. Kaneda, K. Ito, R. Nishida, and S. Kimura, Geometry of the subducting Philippine Sea plate and the crustal and upper mantle structure beneath eastern Shikoku Island revealed by seismic refraction/wide-angle reflection profiling, Zisin 2 (J. Seismol. Soc. Jpn.), 54, 489–505, 2002 (in Japanese with English abstract).

  15. Langston, C., Structure under Mount Rainier, Washington, inferred from telesesimic body waves, J. Geophys. Res., 84, 4749–4762, 1979.

  16. Matsumoto, S., K. Obara, N. Kimura, and M. Nakamura, Imaging P-wave Scatterer Distribution around the Focal Area of the 2000 Western Tottori Earthquake (Mw 6.6), Zisin 2 (J. Seismol. Soc. Jpn.), 55, 229–232, 2002 (in Japanese).

  17. Miyoshi, T. and K. Ishibashi, Geometry of the seismic Philippine Sea Slab beneath the region from Ise bay to Western Shikoku, Southwest Japan, Zisin 2 (J. Seismol. Soc. Jpn.), 57, 139–152, 2004 (in Japanese with English abstract).

  18. Nakanishi, I., Precursors to ScS phases and dipping interface in the upper mantle beneath southwestern Japan, Tectonophysics, 69, 1–35, 1980.

  19. Nishida, R., N. Hirata, K. Ito, Y. Umeda, T. Igawa, and M. Onishi, Subsurface survey beneath the western Tottori region (Part 1), Program. Abst., Seismol. Soc. Jpn., P62, 2002 (in Japanese).

  20. Nugraha, D. A. and J. Mori, Three-dimensional Velocity Structure in the Bungo Channel and Shikoku Area, Japan, and its Relationship to Low-frequency Earthquakes, Geophys. Res. Lett., 33, L24307, doi:10. 1029/2006GL028479, 2006.

  21. Ohkura, T., Structure of the upper part of the Philippine Sea plate estimated by later phases of upper mantle earthquakes in and around Shikoku, Japan, Tectonophysics, 321, 17–36, 2000.

  22. Ohmi, S. and K. Obara, Deep low-frequency earthquakes beneath the focal region of the Mw 6.7 2000 Western Tottori earthquake, Geophys. Res. Lett., 29, doi:10.1029/2001GL014469, 2002.

  23. Owens, T. J., G. Zandt, and S. R. Taylor, Seismic evidence for an ancient rift beneath the Cumberland Plateau, Tennessee: a detailed analysis of broadband teleseismic P-waveforms, J. Geophys. Res., 89, 7783–7795, 1984.

  24. Park, J. and V. Levin, Receiver functions from multiple-taper spectral correlation estimates, Bull. Seismol. Soc. Am., 90, 1507–1520, 2000.

  25. Park, J., C. R. Lindberg, and F. L. Vernon III, Multitaper Spectral Analysis of High-Frequency Seismograms, J. Geophys. Res., 92, 12675–12684, 1987.

  26. Sato, H., Y. Kojima, A. Murata, T. Ito, Y. Kaneda, M. Onishi, T. Iwasaki, Y. Oho, S. Ogino, K. Kano, T. Kawamura, E. Kurashimo, S. Koshiya, A. Takasu, T. Takeshita, N. Tsumura, Y. Terabayashi, F. Toyohara, T. Nakajima, K. Noda, Y. Hashimoto, S. Hasegawa, N. Hirata, T. Miyauchi, T. Miyata, S. Yamakita, T. Yoshida, S. Harder, K. Miller, G. Kaip, T. Ozawa, and T. Ikawa, Crustal Structre of the Outer Zone in Southwest Japan revealed by Shikoku and Seto-Inland-Sea Seismic Profiling in 2002, Bull. Earthq. Res. Inst., 80, 53–71, 2005 (in Japanese with English abstract).

  27. Shibutani, T., The crust and slab structre beneath the eastern Shikoku by receiver function analyses, Earth Monthly, 23, 708–713, 2001 (in Japanese).

  28. Shibutani, T., S. Nakao, R. Nishida, F. Takeuchi, K. Watanabe, and Y. Umeda, Swarm-like seismic activity in 1989, 1990 and 1997 preceding the 2000 Western Tottori Earthquake, Earth Planets Space, 54, 831–845, 2002.

  29. Shibutani, T., H. Katao, and Group for the dense aftershock observations of the 2000 Western Tottori Earthquake, Very dense aftershock observations of the 2000 Western Tottori Earthquake (Mj = 7.3) in southwestern Honshu, Japan: high resolution aftershock distribution, focal mechanisms and 3-D velocity structure in the source region, Earth Planets Space, 57, 825–838, 2005.

  30. Shiomi, K., H. Sato, K. Obara, and M. Ohtake, Configuration of subducting Philippine Sea plate beneath southwest Japan revealed from receiver function analysis based on the multivariate autoregressive model, J. Geophys. Res., 109, B04308, doi:10.1029/2003JB002774, 2004.

  31. Soda, Y., T. Matsuzawa, and A. Hasegawa, Seismic velocity structure of the crust and uppermost mantle beneath the northeast Japan arc estimated from receiver functions, Zisin 2 (J. Seismol. Soc. Jpn.), 54, 347–363, 2001 (in Japanese with English abstract).

  32. Tabei, T., M. Hashimoto, S. Miyazaki, K. Hirahara, F. Kimata, T. Matsushima, T. Tanaka, Y. Eguchi, T. Takaya, Y. Hoso, F. Ohya, and T. Kato, Subsurfacestructure and faulting of the Median Tectonic Line, southwest Japan inferred from GPS velocity field, Earth Planets Space, 54, 1065–1070, 2002.

  33. Ueno, H., S. Hatakeyama, T. Aketagawa, J. Funasaki, and N. Hamada, Improvement of hypocenter determination procedures in the Japan Meteorological Agency, Q. J. Seismol., 65, 123–134, 2002 (in Japanese with English abstract).

  34. Ueno, T., K. Ito, K. Yoshii, K. Matsumura, and H. Wada, Crustal Structure and Seismic Activity around the Atotsugawa Fault System, Central Honshu, Japan, Zisin 2 (J. Seismol. Soc. Jpn.), 58, 143–152, 2005 (in Japanese with English abstract).

  35. Ueno, T., T. Shibutani, and K. Ito, Configuration of the continental Moho and Philippine Sea slab in Southwest Japan derived from receiver function analysis: Relation to subcrustal earthquakes, Bull. Seismol. Soc. Am., 2008 (accepted).

  36. Wessel, P. and W. H. F. Smith Free software helps map and display data, Eos Trans. Am. Geophys. Union, 72, 441, 445–446, 1991.

  37. Yamaguchi, S., Y. Kobayashi, N Oshiman, K. Tanimoto, H. Murakami, I. Shiozaki, M. Uyeshima, H. Utada, and N. Sumitomo, Preliminary report on regional resistivity variation inferred from the Network MT investigation in the Shikoku district, southwest Japan, Earth Planets Space, 51, 193–203, 1999.

  38. Yamauchi, M., K. Hirahara, and T. Shibutani, High resolution receiver function imaging of the seismic velocity discontinuities in the crust and the uppermost mantle beneath southwest Japan, Earth Planets Space, 55, 59–64, 2003.

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Correspondence to Tomotake Ueno.

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Key words

  • Receiver function
  • Philippine Sea plate
  • hypocenter distribution