| 华北地区的震源机制与地壳应力场 |
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| 引用本文： | 李钦祖,靳雅敏,于新昌.华北地区的震源机制与地壳应力场[J].地震学报,1982,4(1):55-61. |
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| 作者姓名： | 李钦祖 靳雅敏 于新昌 |
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| 作者单位： | 河北省地震局 |
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| 摘 要： | 本文分析了1937——1979年华北地区(30——42N,105——124E)根据其可靠程度和地区分布选择的48个地震震源机制。结果说明强震(M6)的一致性很好,主压应力轴(P)大都为北东东-南西西向,主张应力轴(T)大都为北北西-南南东向,并且都近于水平;N轴大都较陡;两组节面的走向分别为北北东向和北西西向;华北地震主要为走滑断层类型。某些中小地震的结果偏离于上述的一致性,可能是由于局部因素的影响,因此,一次中小地震的震源机制结果,不足以反映区域应力场的概况。
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FOCAL MECHANISMS AND CRUSTAL STRESS FIELD IN NORTH CHINA |
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| Affiliation: | Seismological Bureau of Hebei Province |
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| Abstract: | The focal mechanism data of 48 earthquakes of North China (30-41N, 105-124E) from 1937 to 1979 were analysed. They have been selected according to their reliability and spatial distribution of their epicenters. The results show that the com-pressional principal stresses P are mostly in the northeast-east direction and the tensile T in the north-northwest direction, both P and T are nearly horizontal; the null axes N are mostly rather steep; the two nodal planes strike along the north-northeast and northwest-west directions respectively, and the earthquakes of North China appear to be of the strike-slip type.The focal mechanisms of some small and moderate earthquakes appear to deviate from the above uniformity and being more disorderly, probably due to the effects of various local factors. Therefore, it seems that the focal mechanism of a single small or moderate earthquake will not represent the general feature of the stress field in the crust of the whole region. |
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