Article | Open | Published:
Geometry of slab, intraslab stress field and its tectonic implication in the Nankai trough, Japan
Earth, Planets and Spacevolume 54, pages733–742 (2002)
The characteristics of geometry of slabs and the intraslab stress field in the Nankai subduction zone, Japan, were analyzed based on highly accurate hypocentral data and focal mechanism solutions. The results suggest that the shallow seismic zone of the Philippine Sea slab subducts with dip angels between 10 and 22 degrees beneath Shikoku and the Kii peninsula, and between 11 and 40 degrees beneath Kyushu. Two types of seismogenic stress field exist within the slab. The stress field of down-dip compression type can be seen in the slab beneath Shikoku and the Kii peninsula, where the horizontal component of regional compression stress is NNW. On the other hand the stress field of down-dip extension type within the slab is dominant in the region from western Shikoku to Kyushu, where the direction of horizontal compressive stress is near WWN. The existence of the two types of stress field is related to the differences of slab geometry and slab age of the subduciton zone. These properties imply that slab beneath Kyushu (40 Ma) probably is older than that beneath Shikoku and the Kii peninsula (11–20 Ma). The young slab of the oceanic Philippine Sea plate subducts with a shallow angle beneath the Eurasian plate in Shikoku and the Kii peninsula. The subduction has encountered strong resistance there, resulting in a down-dip compression stress field. The down-dip extension stress field may be related to the older slab of the Philippine Sea plate which subducts beneath Kyushu with a steeper dip angle.
Aida, I., Numerical simulation of historical tsunami in the Tokaido offshore region, Bull. Earthq. Res. Inst., Univ. Tokyo, 56, 367–390, 1981.
Ando, M., Source mechanisms and tectonic significance of historical earthquakes along the Nankai trough, Japan, Tectonophys., 27, 119–140, 1975.
Ando, M., A fault model of the 1946 Nankaido earthquake derived from tsunami data, Phys. Earth Planet. Inter., 28, 329–336, 1982.
Ando, M., An outline: for the future Nankai earthquake, what must be done in Japan?, Chikyu Monthly, 24, 6–13, 1999.
Hirahara, K., Three-dimensional seismic structure beneath southwest Japan: the subducting Philippine Sea plate, Tectonophys., 79, 1–44, 1981.
Hori, S., H. Inoue, Y. Fukao, and M. Ukawa, Seismic detection of the untransformed ‘basaltic’ oceanic crust subducting into the mantle, Geophys. J. R. Astr. Soc., 83, 169–197, 1985.
Hyndman, R. D., K. Wang, and M. Yamano, Thermal constraints on the seismogenic portion of the south-western Japan subduction thrust, J. Geophys. Res., 100, 15373–15392, 1995.
Imamura, A., Topographical changes accompanying earthquakes or volcanic eruptions, Publ. Earthquake Invest. Comm., Foreign Languages, 25, 1–143, 1930.
Imamura, A., The Hakuho Great Earthquake, Zisin, 13, 82–86, 1941 (in Japanese).
Ishibashi, K., Specification of a soon-to-occur seismic fault in the Tokai district, Central Japan, based upon seismotectonics, Maurice Ewing, Ser., 3, 297–332, AGU, Washington D. C., 1980.
Ishikawa, Y. and K. Ishihara, The seismicity in the Philippine Sea slab beneath southwest Japan, Abstracts of 1997 Japan Earth and Planetary Science Joint meeting, No. 1, A79, 1997.
Ishikawa, Y. and K. Nakamura, SEIS-PC for Windows 95, Abstracts of 1997 Japan Earth and Planetary Science Joint Meeting, 78, 1997.
Ito, T., S. Yoshioka, and S. Miyazaki, Interplate coupling in southwest Japan deduced form inversion analysis of GPS data, Workshop on Recurrence of Great Interplate Earthquake and its Mechanism, pp. 55–56, 1999.
Jarrard, R. D., Relations among subduction parameters, Geophys. Res. Lett., 24, 217–284, 1986.
Kagami, H., K. Shiono, and A. Taira, Subducting of plate and formation of accretionary prism in Nankai trough, in Formation of Japan Islands,pp. 139–148, Iwanami Shorten Publishers, 1987.
Kamiya, S., Three-dimensional P-wave velocity structure beneath the Japanese Islands estimated from the Seismological Bulletin of the Japan Meteorological Agency, Zisin, 44(2), 185–201, 1991 (in Japanese).
Kanno, K., K. Nishi, M. Iguchi, T. Furuzawa, M. Teraishi, T. Kagiyama, M. Yamaguchi, A. Takagi, T. Kakuta, H. Ono, Y. Sudo, N. Matsuo, and H. Shimizu, A joint study of earthquake in the Kyushu region using data from the Universities’ Seismic Networks, Zisin, 43, Second Series, 543–545, 1990 (in Japanese).
Kikuchi, M., http://wwweic.eri.u-tokyo.ac.jp/EIC/EIC_News/index.html, 2000.
Kimura, S. and K. Okano, The lower crust and the Moho discontinuity in Shikoku, Southwest Japan, Research Reports of Kochi University, 40, Natural Science, 49–61, 1991a (in Japanese).
Kimura, S. and K. Okano, Focal depth distribution of earthquakes off Shikoku and its relation with the 1946 great Nankai earthquake, Research Reports of Kochi University, 40, Natural Science, 63–70, 1991b (in Japanese).
Kimura, S. and K. Okano, Characteristics of focal depth distribution of mantle earthquakes in the central and western part of Shikoku, Zisin, 47(2), 11–19, 1994 (inJapanese).
Kimura, S. and K. Okano, Is the oceanic crust subducting beneath Shikoku, Southwest Japan? Program and Abstracts, of 1998 Fall Meeting, the Seismological Society of Japan, C38, 1998.
Kinoshita, M. and M. Yamano, Heat flow distribution in the Nankai trough region, in Japan-Russia-China Monograph, edited by H. Tokuyama et al., pp. 77–86, Tokyo, TERRAPUB, 1996.
Kodaira, S., N. Takahashi, J. Mochizuki, M. Shinohara, and S. Kimura, The Western Nankai trough seismogenic zone: Result from wide-angle’ Ocean-Bottom Seismographic survey, J. Geophys. Res., 105, 5887–5905, 2000.
Miura, K., T. Tsukuda, R. Miura, Y. Inoue, and S. Asano, Deep seismic zone in the western part of the Seto Naikai (Seto Inland Sea) and its surrounding regions, Southwestern Japan, Bull. Earthq. Res. Inst. Univ. Tokyo, 66, 553–570, 1991.
Mizoue, M., M. Nakamura, N. Seto, and Y Ishiketa, Three-layered distribution of microearthquakes in relation to focal mechanism variation in the Kii peninsula, Southwestern Honshu, Japan, Bull. Earthq. Res. Inst. Univ. Tokyo, 58, 287–310, 1983.
Molnar, P., D. Freedman, and J. Shin, Lengths of intermediate and deep seismic zones and temperatures in down going slabs of lithosphere, Geophys. J. R. Astron. Soc., 56, 41–54, 1979.
Moores, E. M. and R. J. Twiss, Tectonics, W. H. Freeman and company, 1995.
Nakanishi, I., Precursors to ScS phases and dipping interface in the upper mantle beneath Southwestern Japan, Tectonophys., 69, 1–35, 1980.
Nakamura, M., H. Watanabe, T. Konami, S. Kimura, and K. Miura, Characteristic activities of subcrustal earthquakes along the outer zone of Southwestern Japan, Annuals of Disas. Prev Res. Inst, Kyoto Univ., 40(B-1), 1–20, 1997.
National Astronomical Observatory, Rika Nenpyo, 788 pp., Maruzen Press, 1998.
Nishimura, S., M. Ando, and S. Miyazaki, Inter-plate Coupling along the Nankai trough and southeast-ward motion along southern part of Kyushu, Zisin, 51(2), 443–456, 1999 (in Japanese).
Okano, K., M. Nakamura, T. Konomi, and S. Kimura, Recent seismic activities along the Nankai trough off Southwest Japan in relation to major earthquakes, Mem. Fac. Sci. Kochi Univ., 4(B), 1–10, 1983.
Okano, K., S. Kimura, T. Konomi, and M. Nakamura, The Focal distribution of earthquakes in Shikoku and its surrounding regions, Zisin, 38, Second Series, 93–103, 1985 (in Japanese).
Ozawa, T., T. Tabei, and S. Miyazaki, Interplate coupling along the Nankai trough off southwest Japan derived from GPS measurements, Geophys. Res. Lett., 26, 927–930, 1999.
Sacks, I. S., The subduction of young lithosphere, J. Geophys. Res., 88, 3355–3366, 1983.
Sato, R., K. Abe, Y Okada, K. Shimazaki, and Y Suzuki, Parameter Handbook of Earthquake Faults, Japan, Kajima Press, 1995 (in Japanese).
Seno, T., Regional stress fields in Kyushu: Implications to deep processes, Program and abstracts of 1998 Fall Meeting, the Seismological Society of Japan, C37, 1998.
Seno, T., S. Stein, and A. E. Gripp, A model for consistent with NUVEL-1 and geological data, J. Geophys. Res., 98, 17941–17948, 1993.
Shiono, K., Seismicity of the SW Japan arc-subduction of the young Shikoku basin, Modern Geology, 12, 449–464, 1988.
Shiono, K., T. Mikumo, and Y. Ishikawa, Tectonics of the Kyushu-Ryukyu arc as evidenced from seismicity and focal mechanism of shallow to intermediate-depth earthquakes, J. Phys. Earth, 28, 17–43, 1980.
Tokyo Astronomical Observatory, List of disastrous earthquake in Japan, Rika Nenpyo, Maruzen Co. Ltd., 2000 (in Japanese).
Tsuboi, S., K. Abe, and Y Ishikawa, Determination of fault plane solutions for small earthquakes in Japan, J. Phys. Earth, 42, 45–67, 1994.
Usami, T, Materials for Comprehensive List of Destructive Earthquakes in Japan, 416–1995, University of Tokyo Press, Tokyo, 1996 (in Japanese).
Utsu, T., Seismicity of Japan from 1885 through 1925—a new catalog of earthquakes of M ≧ 6 felt in Japan and smaller earthquakes which caused damage in Japan–, Bull. Earthq. Res. Inst. Univ. Tokyo, 54(2), 253–308, 1979 (in Japanese).
Uyeda, S. and H. Kanamori, Back-arc opening and the mode of subduction, J. Geophys. Res., 84, 1049–1061, 1979.
Watanabe, H. and N. Maeda, Seismic activity of subcrustal earthquakes and associated tectonic properties in the southeastern part of the Kinki district, Southwestern Japan, J. Phys. Earth, 38, 325–345, 1990.
Wortel, M. J. R. and N. J. Vlaar, Age-dependent subduction of oceanic lithosphere beneath western South America, Phys. Earth Planet. Inter., 17, 201–208, 1978.
Yamazaki, F. and T. Ooida, Configuration of subducted Philippine Sea plate beneath the Chubu district, Central Japan, Zisin, 38, Second Series, 193–201, 1985 (in Japanese).
Zhao, Z.-X., R. Kubota, F. Suzuki, and S. Iizuka, Crustal structure in the southern Kanto-Tokai region derived from tomographic method for seismic explosion survey, J. Phys. Earth, 45, 433–403, 1997.