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本文对新疆1978年4月22日库尔勒5.8级地震前地震波的动力学特性和运动学特性的某些短期变化进行了初步研究。重点讨论了5.8级地震前通过孕震区的小地震的直达波振幅比、振动持续时间比以及波速比的短期异常变化,並且,结合震前短期地震活动异常图象作了对比分析。实际观测结果表明,较大地震发生前,通过孕震区的小震的地震波特性可能出现一些较明显的短期异常变化,因而,对此进行研究无疑对于探讨地震孕育过程和地震的预报途径都是有意义的。
In this paper, some short-term changes of the dynamic characteristics and kinematic characteristics of seismic waves before the Korla M 5.8 earthquake on April 22, 1978 in Xinjiang were studied. The short-term anomalous variations of the direct wave amplitude ratio, the vibration duration ratio and the wave velocity ratio of the small earthquakes that passed the seismogenic zone before the M 5.8 earthquake are discussed in detail. The short-term seismic anomaly images before the earthquake are compared and analyzed. The actual observation shows that some obvious short-term anomalous changes may occur in the seismic wave characteristics of the small earthquakes passing through the seismogenic zone before the occurrence of the large earthquakes. Therefore, it is undoubtedly the most effective way to study the earthquake breeding process and earthquake prediction meaningful.