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目前,国内外对地震前是否存在波速异常还有不同的看法,关于波速异常的物理解释问题也还有种种不同的观点。为了进一步辨明究竟那些看法或那些观点更有依据,必须继续深入研究波速异常的各种特性,尤其是异常区的一些特性。文献中曾对波速异常区的某些特性作过研究。本文着重探索波速异常区的时空特性,主要是波速异常区的空间分布及其随时间的变化与发展。根据所得的结果,对波速异常的观测范围及其物理解释等问题作了某些初步讨论。
At present, there are still different opinions on whether there is anomalous wave velocity anomalies before earthquakes at home and abroad. There are also various opinions on the physical explanation of wave anomalies. In order to further discern whether those observations or those arguments are more justified, it is important to continue studying in depth the various characteristics of the wave velocity anomalies, especially some of the anomalous zones. In the literature, some characteristics of anomalous regions of wave velocity have been studied. This paper focuses on exploring the spatio-temporal characteristics of anomalous regions of wave velocity, mainly the spatial distribution of anomalous regions of anomalous velocity and its changes and development over time. Based on the results obtained, some preliminary discussions are made on the observation range of wave velocity anomalies and their physical explanations.