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广东省新丰江水库区于1962年3月19日发生6.1级地震。本文分析了1961年以来十四年间,特别是主震前后纵、横波速比V_p/V_s的变化过程。结果表明:波速比V_p/V_s在主震前出现了明显的负异常,总异常时间约为十一个月,于震前一个半月返回正常值,在主震震源附近的深水峡谷区异常幅度最大,异常时间和空间范围比一般构造地震的要小.后期几次强余震前也有异常变化。虚波速度在主震前存在某些异常特征。上述波速比的变化可以用扩容模式较好地解释。 波速比值是由两个台站的记录得到的。对虚波速度的计算采用了联合地震参数的方法。
Xinfengjiang Reservoir Area of Guangdong Province on Mar. 19, 1962, a magnitude 6.1 earthquake. This paper analyzes the changes of the longitudinal and transverse velocity ratios V_p / V_s during the 14 years since 1961, especially before and after the main shock. The results show that the wave velocity ratio V_p / V_s shows a significant negative anomaly before the main shock with a total anomalous time of about 11 months and a return to normal one and a half months before the earthquake. The anomalous amplitude in the deepwater canyon near the mainshock source is the largest , The anomalous time and space range are smaller than those of the general structure earthquakes, and there are also some anomalous changes before several strong aftershocks. The virtual wave velocity has some abnormal features before the main shock. The above change in wave velocity ratio can be better explained by the expansion mode. Wave velocity ratio is recorded by two stations. The method of joint seismic parameters is used to calculate the velocity of the virtual wave.