Dislocation model for strain accumulation in a plate collision zone

Earth, Planets and Space - Tập 52 - Trang 1091-1094 - 2014
Kunihiko Shimazaki1, Yanlai Zhao1
1Earthquake Research Institute, University of Tokyo, Tokyo, Japan

Tóm tắt

Following a scheme developed for a subduction zone by Savage in 1983, which was successfully applied to a transform plate boundary by Matsu’ura and others in 1986, a dislocation model for a plate collision zone is formulated. The solution consists of a rigid plate motion and a tensile dislocation. In addition to this, a strike-slip dislocation is needed when the collision boundary is not perpendicular to the plate converging direction. Theoretically predicted gradual change in horizontal displacements over the collision zone well explains the results of GPS continuous observation in central Japan where the Eurasian and Okhotsk plates are thought to be colliding. The maximum uplift rate is predicted as 1/π times that of converging velocity, however the observed uplift rate is much smaller than that, although vertical movements observed by GPS network is much less accurate than horizontal movements. A comparison of the theoretical results with the observation suggests relatively thin elastic plates, whose thickness is about 30 km. The obtained dislocation model has a close connection with a horizontal detachment fault. The displacement fields above the advancing and retreating edges of a horizontal rectangular detachment fault are mathematically equivalent to those of collision and rift zones, respectively, and lateral edges to a transform fault boundary. The displacement fields at a colliding and a rifting boundaries are the same except for their signs.

Tài liệu tham khảo

Brown, R. J., A dislocation approach to plate interaction, Ph.D. Thesis, Massachusetts Institute of Technology, 1975.

El-Fiky, G. S. and T. Kato, Interplate coupling in the Tohoku district, Japan, deduced from geodetic data inversion, J. Geophys. Res., 104, 20361–20377, 1999a.

El-Fiky, G. S. and T. Kato, Continuous distribution of the horizontal strain in the Tohoku district, Japan, predicted by least-square collocation, Geodynamics, 27, 213–236, 1999b.

Heki, K., S. Miyazaki, H. Takahashi, M. Kasahara, F. Kimata, S. Miura, N. F. Vasilenko, A. Ivashchenko, and K. D. An, The Amurian plate motion and current plate kinematics in eastern Asia, J. Geophys. Res., 104, 29147–29155, 1999.

Hirahara, K., M. Ando, Y. Hoso, Y. Wada, and T. Nakano, Local GPS array for the movement of the Atotsugawa fault, Chikyu, 20, 149–153, 1998.

Iio, Y., A possible generating process of the 1995 southern Hyogo prefecture earthquake—stick of fault and slip on detachment—, J. Seismol. Soc. Japan, 49, 103–112, 1996.

Ikeda, Y., Reverse faults of Japan: On the possibility of flake tectonics, Chikyu-Gogai, 5, 137–152, 1992.

Ito, T., S. Yoshioka, and S. Miyazaki, Interplate coupling in northeast Japan deduced from inversion analysis of GPS data, Earth Planet. Sci. Lett., 176, 117–130, 2000.

Matsu’ura, M., D. D. Jackson, and A. Cheng, Dislocation model for aseismic crustal deformation at Hollister, California, J. Geophys. Res., 91, 12661–12674, 1986.

Miyazaki, S., T. Saito, M. Sasaki, Y. Hatanaka, and Y. Iimura, Expansion of GSI’s nationwide GPS arrays, Bull. Geogr. Surv. Inst., 43, 23–34, 1997.

Miyazaki, S., T. Saito, Y. Hatanaka, T. Sagiya, and T. Tada, The nationwide GPS array as an Earth Observation System, Bull. Geogr. Surv. Inst., 44, 11–22, 1998.

Moritz, H., Interpolation and prediction of gravity and their accuracy, Rep. 24, Inst. Geod. Photogr. Cartogr., Ohio State Univ., Columbus, U.S.A., 1962.

Okada, Y., Surface deformation due to shear and tensile faults in a half-space, Bull. Seismol. Soc. Am., 75, 1135–1154, 1985.

Savage, J. C., A dislocation model for strain accumulation and release at a subduction zone, J. Geophys. Res., 88, 4984–4996, 1983.

Savage, J. C. and R. O. Burford, Geodetic determination of relative plate motion in central California, J. Geophys. Res., 78, 832–845, 1973.

Seno, T., T. Sakurai, and S. Stein, Can the Okhotsk plate be discriminated from the North American plate?, J. Geophys. Res., 101, 11305–11315, 1996.

Shen-Tu, B. and W. E. Holt, Interseismic horizontal deformation in northern Honshu and its relationship with the subduction of the Pacific plate in the Japan trench, Geophys. Res. Lett., 23, 3103–3106, 1996.

Tada, T., Seismotectonic provinces in the Japanese islands based on the horizontal strain of the earth’s crust, Chikyu, 18, 807–811, 1996.

Tada, T., T. Sagiya, and S. Miyazaki, Deforming Japanese islands as seen from GPS observations, Kagaku, 67, 917–927, 1997.

Wei, D. and T. Seno, Determination of the Amurian plate motion, in Mantle Dynamics and Plate Interactions in East Asia, edited by M. Flower et al., Geodynamics Ser., 27, pp. 337–346, 1998.

Yamashina, K., Drag model and crustal deformation in the Japanese islands, Program Abstr., Seismol. Soc. Japan, 1, 56, 1976.

Yoshioka, S., T. Yabuki, T. Sagiya, T. Tada, and M. Matsu’ura, Interplate coupling and relative plate motion in the Tokai district, central Japan, deduced from geodetic data inversion using ABIC, Geophys. J. Int., 113, 607–621, 1993.

Zhao, Y., Application of dislocation model for plate collision to aseismic crustal deformation in central Japan, Ph.D. Thesis, University of Tokyo, 1999.

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Earth, Planets and Space

Tập 52

1091-1094

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