倾斜断层错动产生的应力场

黄福明, 王廷韫

倾斜断层错动产生的应力场

黄福明, 王廷韫

国家地震局地震地质大队

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- 发布日期: 2011-08-31

THE STRESS FIELD OF A DISLOCATING INCLINED FAULT

HUANG FU-MING, WANG TING-YUN

Seismotectonic Brigade, State Seismological Bureau

摘要

摘要: 本文导出拉梅常数不相等情形的半无限弹性介质中任意倾角的矩形断层错动产生的应力场的解析表达式.给出走向滑动和倾向滑动的倾斜断层的应力场在地表面的等值线图.讨论了介质的泊松比、断层面的倾角、上界和下界对地面的应力场的影响.作为一种应用,计算了通海地震、海城地震和唐山地震断层近场的剪应力和流体静应力的等值线图,并同这三个地震的强余震的空间分布作比较,发现大多数强余震分布在流体静应力为正值的引张区内.

Abstract: In this paper, analytical expressions of the stress field given rise by a rectangular dislocating fault of an arbitrary dip in a semi-infinite elastic medium for the case of unequal Lame constants are derived. The results of computations for the stress fields on the ground surface of an inclined strike-slip and an inclined dip-slip fault are represented by contour maps. The effects of Poisson Ratio of the medium, the dip angle, upper and lower boundaries of the faults on the stress field at surface have been discussed. As an application, the contour maps for shear stress and hydrostatic stress of near fields of the Tonghai (1970), Haicheng (1975) and Tangshan (1976) earthquakes have been calculated and compared with the spatial distributions of strong aftershocks of these earthquakes. It is found that most of the strong aftershocks are distributed in the regions of tensional stress, where the hydrostatic stress is positive.

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参考文献(1)

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[2] J. A. Steketee, Some geophysical applications of the elasticity theory of dislocations. Can. Jour. Phys., 36, 9, 1168—1198, 1958.

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[4] M. A. Chinnery, The stress changes that accompany strike—slip faulting, Bull. Seism. Soc. Amer., 53, 5, 921—932, 1863.

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[11] 陈运泰等, 根据地面形变的观测研究1966年邢台地震的震源过程,地球物理学报,18, 3, 164—181, 1975.

[12] 松浦充宏·佐藤良辅,Displacement fields due to the fault,地震,第2辑,28, 4, 429—434, 1975.

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倾斜断层错动产生的应力场

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THE STRESS FIELD OF A DISLOCATING INCLINED FAULT

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