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Two-layer Q s structure of the slab near the southern Kurile trench


We estimate Qs values (quality factor for S-wave) of the slab near the southern Kurile trench by using seismic data observed at ocean bottom seismometer (OBS) stations from selected local earthquakes. The seismic rays pass mainly through the slab and this enable us to directly estimate the slab Qs values. The spectral inversion and coda normalization method are applied to these data. The estimated Qs values from the two methods are nearly the same and increase with frequencies. However, these Qs values are not high enough to explain the abnormal distribution of ground motion that has been recognized as abnormal distribution of seismic intensities at the Japanese arc. Thus we propose a two-layer Qs structure of the slab to explain the both facts, our slab Qs values and the abnormal distribution of ground motion. The two-layer Qs structure consists of the upper layer with not so high Qs values (39f1.0) and lower layer with very high Qs values (500f1.0); the upper layer has a thickness of about 50 km. Seismic activity is restricted only within the upper layer of the two-layer Qs structure. This may mean that the two-layer Qs structure reflects the different material property between the upper and lower layer of the slab.


  • Aki, K., Attenuation of shear-waves in the lithosphere for frequencies from 0.05 to 25 Hz, Phys. Earth Planet. Inter., 21, 50–60, 1980.

    Article  Google Scholar 

  • Aki, K. and B. Chouet, Origin of coda waves: source, attenuation and scattering effects, J. Geophys. Res., 80, 3322–3342, 1975.

    Article  Google Scholar 

  • Aki, K. and P. G. Richards, Quantitative Seismology. vol. 1, 557 pp.,W. H. Freeman and Company, 1980.

  • Aoi, S., K. Obara, S. Hori, K. Kasahara, and Y. Okada, New strong-motion observation network: KiK-net, EOS Trans. AGU, 329, 2000.

    Google Scholar 

  • Butler, R., C. S. McCreery, L. N. Frazer, and D. A. Walker, High-frequency seismic attenuation of oceanic P and S waves in the Western Pacific, J. Geophys. Res., 92, 1383–1396, 1987.

    Article  Google Scholar 

  • Çervený, V., I. A. Molotkov, and I. Pšenćík, Ray Method in Seismology, 214 pp., Univerzita Karlova, Praha, 1977.

  • Fehler, M., M. Hoshiba, H. Sato, and K. Obara, Separation of scattering and intrinsic attenuation for the Kanto-Tokai region, Japan, using measurements of S-wave energy versus hypocentral distance, Geophys. J. Int., 108, 787–800, 1992.

    Article  Google Scholar 

  • Fukuyama, E., M. Ishida, S. Hori, S. Sekiguchi, and S. Watada, Broadband seismic observation conducted under the FREESIA Project, Rep. Natl. Res. Inst. Earth Sci. Disaster Prev., 57, 23–31, 1996.

    Google Scholar 

  • Furumura, T. and B. L. N. Kennett, Subduction zone guided waves and the heterogeneity structure of the subducted plate: intensity anomalies in northern Japan, J. Geophys. Res., 110, B10302, doi:10.1029/2004JB003486, 2005.

    Article  Google Scholar 

  • Hirata, K., M. Aoyagi, H. Mikada, K. Kawaguchi, Member, IEEE, Y. Kaiho, R. Iwase, S. Morita, I. Fujisawa, H. Sugioka, K. Mitsuzawa, K. Suyehiro, H. Kinoshita, and N. Fujiwara, Real-time geophysical measurements on the deep seafloor using submarine cable in the southern Kurile subduction zone, IEEE J. Ocean. Eng., 27(2), 170–181, 2002.

    Article  Google Scholar 

  • Hoshiba, M., Separation of scattering attenuation and intrinsic absorption in Japan using the multiple lapse time window analysis of full seismogram envelope, J. Geophys. Res., 98, 15809–15824, 1993.

    Article  Google Scholar 

  • Huerta-Lopez, C., J. Pulliam, and Y. Nakamura, In situ evaluation of shearwave velocities in seafloor sediments with a broadband ocean-bottom seismograph, Bull. Seism. Soc. Am., 93, 139–151, 2003.

    Article  Google Scholar 

  • Iwasaki, T., H. Shiobara, A. Nishizawa, T. Kanazawa, K. Suyehiro, N. Hirata, T. Urabe, and H. Shimamura, A detailed subduction structure in the Kuril trench deduced from ocean bottom seismographic refraction studies, Tectonophysics, 165, 315–336, 1989.

    Article  Google Scholar 

  • Iwata, T. and K. Irikura, Source parameters of the 1983 Japan Sea earthquake sequence, J. Phys. Earth, 36, 155–184, 1988.

    Article  Google Scholar 

  • Kinoshita, S., Kyoshin Net (K-NET), Seism. Res. Lett., 69, 309–332, 1998.

    Article  Google Scholar 

  • Kubo, A., T. Ouchi, and H. Shimamura, Envelope broadening and spatial attenuation of S-waves in the oceanic lithosphere, Mem. Grad. School Sci. and Technol., Kobe Univ., 13-A, 101–116, 1995.

    Google Scholar 

  • Lawson, C. L. and R. J. Hanson, Solving Least Squares Problems, 340 pp., Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 1974.

    Google Scholar 

  • Maeda, T., A study on characteristics of seismic wave attenuation and seismic source in the subduction zone, Doctoral dissertation, Hokkaido University, Sapporo, Japan, 134 pp., 2003 (in Japanese).

    Google Scholar 

  • Nafe, J. E. and C. L. Drake, Physical properties of crustal materials as related to compressional wave velocities, paper presented at Annual Meeting of Soc. Expl. Geophys., Dallas, Texas, 1957.

    Google Scholar 

  • Nakamura, R. and T. Uetake, Three dimensional attenuation structure and site amplification inversion by using a large quantity of seismic strong motion records in Japan, paper presented at 12th World Conference on Earthquake Engineering, Auckland, New Zealand, Jan. 30 to Feb. 4, 2000, ID 0724.

  • Phillips, W. and K. Aki, Site amplification of coda waves from local earthquakes in central California, Bull. Seism. Soc. Am., 76, 627–648, 1986.

    Google Scholar 

  • Sato, H. and M. C. Fehler, Seismic Wave Propagation and Scattering in the Heterogeneous Earth, 308 pp., AIP Press/Springer Verlag, New York, 1998.

    Book  Google Scholar 

  • Talandier, J. and M. Bouchon, Propagation of high frequency Pn wave at great distances in the central and south Pacific and its implications for the structure of the lower lithosphere, J. Geophys. Res., 84, 5613–5619, 1979.

    Article  Google Scholar 

  • Tsumura, K., Determination of earthquake magnitude from total duration of oscillation, Bull. Earthq. Res. Inst. Univ. Tokyo, 45, 7–18, 1967.

    Google Scholar 

  • Tsumura, N., S. Matsumoto, S. Horiuchi, and A. Hasegawa, Threedimensional attenuation structure beneath the northeastern Japan arc estimated from spectra of small earthquakes, Tectonophysics, 319, 241–260, 2000.

    Article  Google Scholar 

  • Umino, N. and A. Hasegawa, Three-dimensional Qs structure in the northeastern Japan arc, Zisin II, 37, 217–228, 1984 (in Japanese with English abstract).

    Google Scholar 

  • Utsu, T., Anomalies in seismic wave velocity and attenuation associated with a deep earthquake zone, J. Fac. Sci., Hokkaido Univ., Ser. VII (Geophys.), 3, 1–25, 1967.

    Google Scholar 

  • Wessel, P. and W. H. Smith, New version of the Generic Mapping Tools released, EOS Trans. AGU, 329, 1995.

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Maeda, T., Sasatani, T. Two-layer Q s structure of the slab near the southern Kurile trench. Earth Planet Sp 58, 543–553 (2006).

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