薛志照, 杨港生. 唐山地震区应力场和地震断层活动特征[J]. 华北地震科学, 1993, 11(1): 19-29.
引用本文: 薛志照, 杨港生. 唐山地震区应力场和地震断层活动特征[J]. 华北地震科学, 1993, 11(1): 19-29.
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Xue Zhizhao, Yang Gangsheng. STRESS FIELD OF THE TANGSHAN EARTHQUAKE AREA AND ACTIVE CHARACTERS OF THE EARTHQUAKE FAULT[J]. North China Earthquake Sciences, 1993, 11(1): 19-29.
Citation: Xue Zhizhao, Yang Gangsheng. STRESS FIELD OF THE TANGSHAN EARTHQUAKE AREA AND ACTIVE CHARACTERS OF THE EARTHQUAKE FAULT[J]. North China Earthquake Sciences, 1993, 11(1): 19-29.
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唐山地震区应力场和地震断层活动特征

STRESS FIELD OF THE TANGSHAN EARTHQUAKE AREA AND ACTIVE CHARACTERS OF THE EARTHQUAKE FAULT

    摘要
  • 摘要: 本文收集了1976年7月28日(唐山地震后),至1989年4级以上地震的震源机制参数。对1976—1979年的震源机制的断层错滑角、断层性质、旋转方式做了补充测定,1979—1989年进行了计算机计算,从应力轴空间位置、断层产状、性质、旋转方式、错滑运动情况进行分析。结果表明:唐山地区在近东西向的主压应力下,许多断层走向为北东、倾角较大,以右旋逆断层为主,水平向错动量为垂直向的1—2倍。宁河、滦县在区域应力作用下,受局部构造的影响,呈现出不同特征。

     

    Abstract: In this paper, the focal mechanism parameters of the earthquakes of M ≥ 4 occurred from July 28, 1976 to 1989 are colected.The dislocated-slip angle of the fault plane, fault features and rotation mode of the focal mechanisms of the earthquakes in 1976-1979 are determined and added.324 earthquakes occurred in 1976-1989 have been confirmed by computer.The space position of the stress axis, the occurrence nature, rotation mode and dislocated-slip movenent of the fault plane have been studied.The results show that the principal pressure stress in Tangshan area is nearly in the direction EW, the fracture surface strike is NE, the deep angle is large.The faults are mainly the right lateral reverse faults, the horizontal dislocation is 1-2 tiroes the vertical one.Under the effect of the regional stress, the earthquake source mechanism in Ninghe and Luanxian areas show different characters.

     

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