| 1976年四川省松潘-平武7.2级地震前后主压应力轴的方向特征 |
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| 引用本文： | 成尔林,李桂芳,陈和川.1976年四川省松潘-平武7.2级地震前后主压应力轴的方向特征[J].地震学报,1982,4(2):136-148. |
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| 作者姓名： | 成尔林 李桂芳 陈和川 |
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| 作者单位： | 四川省地震局 |
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| 摘 要： | 本文应用1966mdash;1976期间,甘肃南部和四川北部地区地震P波初动方向资料,求出平均节面解,据此推断松潘mdash;平武7.2级地震前,孕震应力场的最大主压应力方向为近东西向。但由松潘台资料所得最大主压应力轴的方向,在震前显示出近90deg;的转动。 由余震资料所得释放应力场的最大主压应力方向,亦为近东西向。
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ON THE DIRECTION OF THE MAXIMUM COMPRESSIVE PRINCIPAL STRESS BEFORE AND AFTER THE 1976 SONGPAN-PINGWU EARTHQUAKE(M=7.2) OF THE SICHUAN PROVINCE |
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| Affiliation: | Seismological Bureau of Sichuan Province |
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| Abstract: | The average nodal plane solutions of the earthquakes occurred in southern Gansu and northern Sichuan Provinces from 1966 to 1976 are obtained by use of P-wave onset data. On the basis of these solutions, it can be inferred that the direction of the maximum compressive principal stress during the process of development of the earthquake is nearly east-west before the Songpan-Pingwu Earthquake. Whereas that obtained from the data of the Songpan seismological station, it appears to have been rotated by an angle of about 90? However the direction of the maximum compressive principal stress in releasing as obtained from data of aftershocks is also nearly east-west. |
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