Abstract
In this paper, the roles of low velocity and high conductivity body inside the crust in the process of strong earthquake preparation are approached by using theoretical analysis method based on the comprehensive researches on the fine structure of strong seismic source in the North China. The following results are obtained. The low-velocity and high-conductivity body plays the promoting role for the action of deep-seated structure in the medium stage of earthquake preparation, except that its existence is advantageous to the stress concentrating in the overlying brittle layer during the process of earthquake preparation. And it plays the triggering role for the occurrence of strong earthquake in the later stage of earthquake preparation.
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References
Gu Z J, Guo C H, Li B, et al. 1995. Preliminary research for low-velocity and high-conductivity layer in crust. Scientia Sinica (Series B), 25(1): 108–112 (in Chinese)
Liu F L, Shen Q H, Geng Y S, et al. 1997. Experimental study of melting reaction and genetic mechanism of mineral phase transformation in granulite facies metamorphism. Acta Geologica Sinica, 71(3): 255–265 (in Chinese)
Liu F T, Qu K X, Wu H, et al. 1986. Seismic tomographic image in the North China. Acta Geophysica Sinica, 29(4): 442–449 (in Chinese)
Mei S R. 1995. On the physical model of earthquake precursor fields and the mechanism of precursors’ time-space distribution (I) — Origin and evidences of the strong body earthquake-generating model. Acta Seismologica Sinica, 8(3): 337–350
Mei S R. 1996a. On the physical model of earthquake precursor fields and the mechanism of precursors’ time-space distribution (II) — How do the stress and strain fields evolve while a strong earthquake is in preparation and how does the evolution after the seismicity and earthquake precursors. Acta Seismologica Sinica, 9(1): 1–12
Mei S R. 1996b. On the physical model of earthquake precursor fields and the mechanism of precursors’ time-space distribution (III) — Anomalies of seismicity and crustal deformation and their mechanism when a strong earthquake is in preparation. Acta Seismologica Sinica, 9(2): 221–133
Nowacki W. 1962. Thermoelasticity. Oxford: Pergamon Press, 57–103
Nur A, Byerlee J D. 1971. An exact effective stress law for elastic deformation of rock with fluids. J Geophys Res, 76: 6 414–6 419
Rice J R, Cleary M P. 1976. Some basic stress diffusion solution for fluid-saturated elastic porous media with compressible constituents. Rev Geophys Space Phys, 14: 227–241
Song Z P, Yin X C, Chen X Z. 1998. Quantitative study of stress concentration of the inclusion model. Journal of Seismological Research, 21(3): 247–255 (in Chinese)
Sun R M, Zhao Y L, Mei S R. 1993. Seismic tomography image in Bohai Sea and its adicent area. Acta Geophysica Sinica, 36(1): 44–54 (in Chinese)
Sun R M, Liu F T. 1995. Crust structure and strong earthquake in Beijing, Tianjin, Tangshan area: I. P wave velocity structure. Acta Geophysica Sinica, 38(5): 599–607 (in Chinese)
Wang C Y, Wang G M, Lin Z Y, et al. 1993. A study on fine crustal structure in Xingtai earthquake area based on deep seismic reflection profiling. Acta Geophysica Sinica, 36(4): 445–452 (in Chinese)
Wang C Y, Zhang X K, Lin Z Y, et al. 1994. Characteristic of crustal structure in the Shulu fault basin and its vicinity. Acta Seismologica Sinica, 7(4): 587–594
Xu C F. 1997. The evolution of crustal fault and the causes of earthquake. Acta Seismologica Sinica, 10(2): 173–180
Yin J Y, Mei S R, Xue Y. 1999. Relationship between the deep crustal feature in velocity structure and the preparation of strong earthquakes in Xingtai area. Acta Geophysica Sinica, 42(5): 629–639 (in Chinese)
Zhang X K, Wang C Y, Liu G D, et al. 1996. Fine crustal structure in Yanqing-Huailai region by deep seismic reflection profiling. Acta Geophysica Sinica, 39(3): 356–364 (in Chinese)
Zhang X K, Yang Y C, Zhao P, et al. 1994. Three-dimensional seismic transmission experiment in the Luanxian earthquake region of North China: Tomography determination of the upper and middle crust structure. Acta Geophysica Sinica, 37(6): 759–766 (in Chinese)
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This work is a part of Project 95-04-03-04-04 from China Seismological Bureau.
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Li, BQ., Niu, ZR. & Duan, F. Preliminary analysis for the roles of crustal low-velocity and high-conductivity body in process of strong earthquake preparation. Acta Seimol. Sin. 13, 151–158 (2000). https://doi.org/10.1007/s11589-000-0004-0
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DOI: https://doi.org/10.1007/s11589-000-0004-0