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本文探讨了用P波频谱研究不对称双侧破裂方式与正交破裂方式的方法,研究了用复合型法反演震源参数的可行性。 用这种方法反演了1966年3月8日邢台马兰6.8级地震及1966年3月22日东旺6.7级地震的震源参数。通过与用网格尝试法反演的结果及余震分布等进行比较,认为这种反演方法除了与过去的网格尝试法类似,可以得到最优拟合参数解外,还可以大大减少计算量,实现了网格尝试法难以实现的更复杂的震源模式的反演。 本文还用此方法研究了1962年3月19日广东河源6.1级地震及1969年7月26日广东阳江6.4级地震的破裂过程。研究结果表明:河源地震的破裂方式是正交三侧破裂。北西方向为主破裂,破裂长度8km,破裂速度0.6km/s. 南东方向破裂长度较短,约2km,破裂速度2.0km/s.正交侧指向南西,破裂长度3km,破裂速度0.5km/s,这个结果与余震分布图所显示的图象很相象。阳江地震的破裂方式是不对称双侧破裂。主破裂方向为北东东,破裂长度14km,破裂速度0.8km/s;朝南西西向的破裂长度5km,破裂速度0.6km/s。
In this paper, we discuss the method of using the P-wave spectrum to study the asymmetric bilateral fracture mode and the orthogonal fracture mode, and study the feasibility of using complex method to invert the source parameters. Using this method, the source parameters of the M = 6.8 Mtau earthquake in Xingtai on March 8, 1966 and the Dongwang earthquake of March 22, 1966 were retrieved. By comparing with the results of grid inversion method and the distribution of aftershocks, we think that this inversion method can get the best fitting parameters solution besides the similar gridding method in the past, and can greatly reduce the computational cost , A more complicated inversion of the source model is achieved, which is hard to be achieved by the grid experiment. This paper also uses this method to study the rupture process of the Ms6.1 Heyuan MS 6.1 earthquake on March 19, 1962 and the Ms6.4 earthquake in Yangjiang, Guangdong on July 26, 1969. The results show that the rupture mode of Heyuan earthquake is rupture on three sides of orthogonal. The rupture length is 8km and the rupture speed is 0.6km / s.The rupture length in the southeast direction is short, about 2km, and the rupture speed is 2.0km / s.The orthogonal side points to the southwest, the rupture length is 3km, the rupture speed is 0.5km / s, this result is very similar to the image shown by aftershock distribution. Yangjiang earthquake rupture is asymmetric bilateral rupture. The main rupture direction is the north east and east, the rupture length is 14km and the rupture speed is 0.8km / s. The rupture length is 5km and the rupture speed is 0.6km / s.