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利用四川及甘肃台网记录到的直达波到时资料,对1976年8月四川松潘—平武地震前的波速比异常变化作了初步探讨.所得结果表明,此次地震前波速比有明显的异常变化,V_p/V_s异常期及恢复期均较短,异常区在偏于主震震中南面的四川境内,其范围较大.V_p/V_s 异常的某些特点显示出这次地震与1973年8月松潘(?)南坪6.5级地震既有密切关系,又有一定的区别.结合这一地区波速比异常变化的特点,本文对波速比回返问题和波速异常区叠加问题作了一些讨论.
Based on the data of the arrival time of direct waves recorded in Sichuan and Gansu, the anomalous variation of the wave velocity ratio before the Songpan-Pingwu earthquake in Sichuan Province in August 1976 was discussed. The results show that the wave velocity ratio before the earthquake is obviously The anomaly and V_p / V_s anomaly and recovery period are both short, and the anomaly area is larger in Sichuan Province, which is slightly south of the main epicenter. Some characteristics of V_p / V_s anomaly show that the earthquake was similar to the one of 8 There is a close relationship and a certain difference between the M6.0 Nanping earthquake and the Songpanpan (?) Nanping earthquake.Considering the characteristics of the anomalous wave velocity anomaly in this area, some discussions are made on the wave velocity ratio return problem and the wave velocity anomalous area superposition problem.