| 海城地震双向构造活动的研究 |
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| 引用本文： | 李荣安,于军.海城地震双向构造活动的研究[J].地震学报,1985,7(4):385-397. |
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| 作者姓名： | 李荣安 于军 |
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| 作者单位： | 辽宁省地震局 |
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| 摘 要： | 本文利用海城地震的MS>3.5的5个前震和MS>3.0的18个余震资料,根据文献2]提供的方法,确定了这些地震断层面破裂方向及破裂传播速度。在海城震区平面上展布结果表明,地震断层面破裂方向与北东向和北西向区域断裂构造走向、震后产生的地裂缝分布方位、地震烈度等震线形态相一致。进一步证明海城7.3级地震前后,不仅与大震断层走向一致的北西向断裂有强烈活动,而且北东向构造也有显著活动。说明后者对海城地震的孕育和发生也起了重要作用。因此,海城地震的发生是两组近于共轭构造活动的结果。
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A STUDY ON THE BIDIRECTIONAL TECTONIC ACTIVITY OF THE HAICHENG EARTHQUAKE |
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| Affiliation: | Seismological Bureau of Liaoning Province |
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| Abstract: | The authors used the information about five foreshocks (Ms>3.5) and eighteen aftershocks (Ms>3.0) of the Haicheng earthquake of February 1975 to determine the fracture directions of these shock faults and fracture speeds according to the method given in reference 2]. It was found that the distribution of the fracture directions in. the Haicheng shock area are basically consistent with the N-E and N-W strikes of local fracture tectonics,with the strikes of surface fissures created by the aftershocks and with the configuration of the macroscopic isoseismic lines. Further,it was also found that not only the N-W fractures consistent with the fault strike of the major shock were strongly active,but also the N-E faults were evidently active before and after Ms 7.3 Haicheng mainshock,and that the faults striking N-E also played an important role in the seismogenic process. Therefore,the occurrence of the Haicheng earthquake seems to be the result of the activity of two nearly conjugate sets of faults. |
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