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ZANG SHAOXIAN, NING JIEYUAN, XU LIZHONGcom sh advance. 1989: THE DISTRIBUTION OF EARTHQUAKES, BEHAVIOR OF THE SUBDUCTION ZONE AND STRESS STATE IN THE RYUKYU ISLAND ARC. Acta Seismologica Sinica, 11(2): 113-123.
Citation: ZANG SHAOXIAN, NING JIEYUAN, XU LIZHONGcom sh advance. 1989: THE DISTRIBUTION OF EARTHQUAKES, BEHAVIOR OF THE SUBDUCTION ZONE AND STRESS STATE IN THE RYUKYU ISLAND ARC. Acta Seismologica Sinica, 11(2): 113-123.
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THE DISTRIBUTION OF EARTHQUAKES, BEHAVIOR OF THE SUBDUCTION ZONE AND STRESS STATE IN THE RYUKYU ISLAND ARC

  • Department of Geophysics, Peking University

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  • Published Date: September 01, 2011
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    • Abstract
  • The distribution and focal mechanisms of earthquakes from 1966 to 1982 in the Ryukyu island arc and the Okinawa trough were studied using the data from I. S. C. and the network of Chinese seismological stations. The behavior of the subduction zone and the stress state were discussed. The earthquakes of mb4.0 distribute mainly in an arc-like narrow belt in the west side of the Ryukyu trench and form a clear Benioff zone beneath the island arc. To the north of the Tokara channel, the subduction zone curves heavily, the dip angle is steep in the lower part, about 72; The axes of the principal tension stress are in the subduction plane, mainly coincide with the subducting direction and the axes of the principal compression stress are nearly horizontal below 70 km. To the south of the Tokara channel, the dip angle of the subduction zone is smaller, about 55, in the lower part; The axes of the principal compression stress are mostly in the subducting plane and most of the axes of the principal tension stress are nearly horizontal below 90 km. It seems that there is a double seismic zone on the subduction zone.In the Okinawa trough, the axes of principal tension stress are in the NNW direction and nearly horizontal, the axes of the principal compression stress appear to be in the NEE direction. The stress state in northern part of China is similar to that in the Okinawa trough, there is no compression effect from the Philipping sea plate on the northern part of China.
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    • References (1)
  • [1] Katsumata,M.and 1969. Seismicity tectonics of the western Pacific:Izu——Mariana——Caroline and Ryukyu——Taiwan regions. J. Geophys. Res., 74, 5923——5948.

    [2] Wu, F. T., 1970.Focal mechanism and tectonics in the vicinity of Taiwan. Bull. Seism. Soc., Am., 60,2045——2056.

    [3] Fitch, L, 1972. Plate convergence, transcurrent faults and internal deformation adjacent Asia and the wes——tern Pacific. J. Geophys. Res., 77, 4432——4460.

    [4] Shiono, K., T. Mikumo, and Y. Ishikawa, 1980. Tectonics of the Kyushu——Ryukyuarc as evidenced frorra seismicity and focal mechanism of shallow to intermediate——depth earthquakes. J. Phys. Earth, 28, 17——43.

    [5] lchikawa, M,1971. Reanalyses of mechanism of earthquakes which occured in and near Japan, and sta——tistical studies on the modal plane solutions obtained, 1928——1968. Gaophys. bfag., 35. 207——274.

    [6] Isacks, B. and P, Molnar, 1971. Distribution of stresses in the descending lithosphere from a global survey of focal mechanism solutions of mantal earthquakes. Pcv. Geaphys. Space Phys., 9, 103——174.

    [7] Wageman, J. M., T. W. C. Hilde, and K. O. Emery, 1970. Structural framework of east China sea and Yellow sca. Amer. Assoc. Petrol. Genl., 54, 1611——1643

    [8] Lee, Chao——Shing, G. G. Jr. Shor, L. D. Bibee, R. S. Lu, and T. W. C. Hilde, 1980. Okinawa trough:Origin of a back——are basin. Marine Geol., 35, 219——241.

    [9] Eguchi, T, and S. Uyeda, 1983. Seismotectonics of the Okinawa trough and Ryukyu arc. Memoir of Geol.Soc. of China, 5, L89——210.

    [10] Konishi, K., 1965. Geotectonic framewor!t of tire Ryukyu island (Nansei shoto). J. Geol. Soc. Japan, 71,437——457.

    [11] 减绍先,1981,地震断裂和应力场.地震地质,3,37——46,

    [12] 减绍先,1987,缅甸山脉地区Benioff带的形态及其应力状态.地球物理学报,30,144——158,

    [13] Kizaki, K., 1978. Tectonics of the Ryukyu. islandarc. J. Phys. Earth, 26, Suppl., s301——s307

    [14] Letouzey, J. and M. Kimura, 1985. Okinawa trough genesis: structure and evolution of a backare basin developed in a continent. Marine and Pexrol. Geol., 2. 111——130.

    [15] Uyeda, S, and H. Kanamori, 1979. Back——arc opening and the mode of subduction. J. Geophyr. Res., 84, 1049——1062.

    [16] Seno, T., 1977. The instantaneous rotation vector of the Philipping sea plate relative to the Eurasian plate Tectonophysics, 42, 209——226.

    [1] Katsumata,M.and 1969. Seismicity tectonics of the western Pacific:Izu——Mariana——Caroline and Ryukyu——Taiwan regions. J. Geophys. Res., 74, 5923——5948.

    [2] Wu, F. T., 1970.Focal mechanism and tectonics in the vicinity of Taiwan. Bull. Seism. Soc., Am., 60,2045——2056.

    [3] Fitch, L, 1972. Plate convergence, transcurrent faults and internal deformation adjacent Asia and the wes——tern Pacific. J. Geophys. Res., 77, 4432——4460.

    [4] Shiono, K., T. Mikumo, and Y. Ishikawa, 1980. Tectonics of the Kyushu——Ryukyuarc as evidenced frorra seismicity and focal mechanism of shallow to intermediate——depth earthquakes. J. Phys. Earth, 28, 17——43.

    [5] lchikawa, M,1971. Reanalyses of mechanism of earthquakes which occured in and near Japan, and sta——tistical studies on the modal plane solutions obtained, 1928——1968. Gaophys. bfag., 35. 207——274.

    [6] Isacks, B. and P, Molnar, 1971. Distribution of stresses in the descending lithosphere from a global survey of focal mechanism solutions of mantal earthquakes. Pcv. Geaphys. Space Phys., 9, 103——174.

    [7] Wageman, J. M., T. W. C. Hilde, and K. O. Emery, 1970. Structural framework of east China sea and Yellow sca. Amer. Assoc. Petrol. Genl., 54, 1611——1643

    [8] Lee, Chao——Shing, G. G. Jr. Shor, L. D. Bibee, R. S. Lu, and T. W. C. Hilde, 1980. Okinawa trough:Origin of a back——are basin. Marine Geol., 35, 219——241.

    [9] Eguchi, T, and S. Uyeda, 1983. Seismotectonics of the Okinawa trough and Ryukyu arc. Memoir of Geol.Soc. of China, 5, L89——210.

    [10] Konishi, K., 1965. Geotectonic framewor!t of tire Ryukyu island (Nansei shoto). J. Geol. Soc. Japan, 71,437——457.

    [11] 减绍先,1981,地震断裂和应力场.地震地质,3,37——46,

    [12] 减绍先,1987,缅甸山脉地区Benioff带的形态及其应力状态.地球物理学报,30,144——158,

    [13] Kizaki, K., 1978. Tectonics of the Ryukyu. islandarc. J. Phys. Earth, 26, Suppl., s301——s307

    [14] Letouzey, J. and M. Kimura, 1985. Okinawa trough genesis: structure and evolution of a backare basin developed in a continent. Marine and Pexrol. Geol., 2. 111——130.

    [15] Uyeda, S, and H. Kanamori, 1979. Back——arc opening and the mode of subduction. J. Geophyr. Res., 84, 1049——1062.

    [16] Seno, T., 1977. The instantaneous rotation vector of the Philipping sea plate relative to the Eurasian plate Tectonophysics, 42, 209——226.
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