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本文对近年来我国西部地区发生的某些强震及中强震(M_S>5.0)的波速比异常作了一些初步探讨.文中给出并讨论了这些地震的波速比异常的一些共同特征,即随时间变化的曲线形态、异常特征量(异常持续时间与异常幅度)和异常的统计分布特征.此外还讨论了波速比异常的特性与地震序列类型、震源深度及震源机制的关系,探索了波速比异常与波速异常间的关系.最后还指出了地震活动性与波速比异常的某种对应关系,并作了简要的讨论.
In this paper, some anomalous wave velocity anomalies of some strong earthquakes and moderate earthquakes (M_S> 5.0) occurred in western China in recent years are discussed in this paper. Some common characteristics of the anomalous wave velocity ratios of these earthquakes are given and discussed The time-varying curve shape, the amount of anomalous features (anomalous duration and anomaly amplitude) and the statistical distribution of anomalies. In addition, the relationship between the anomalous wave-velocity ratio and the types of seismic sequences, focal depths and focal mechanisms is also discussed. Than the relationship between anomaly and anomaly of wave velocity.At last, some corresponding relationship between seismicity and anomalous wave velocity ratio is also pointed out and briefly discussed.