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本文介绍了根据近地震直达波到时资料确定震前波速异常区(简称孕震区)的方法,并给出了我国西部地区某些较大地震前波速异常区(孕震区)的初步测定结果。探索并讨论了孕震区的一些基本特性,即孕震区的形状、大小,孕震区的定向,主震在孕震区内所处的部位,孕震区内部波速异常状态的分布与发展等。最后还导出了孕震区线度与震源区尺度间的关系式,并作了简单的讨论。
This paper presents a method to determine anomalous wave velocity anomalies before earthquake (referred to as seismogenic zone) based on the near arrival time of near-Earthquakes, and gives a preliminary determination of the anomalous wave velocity anomalies (seismogenic zone) before some large earthquakes in western China result. Some basic characteristics of the seismogenic zone are explored and discussed, that is, the shape and size of the seismogenic zone, the orientation of the seismogenic zone, the location of the main shock in the seismogenic zone, the distribution and development of the anomalous wave velocity in the seismogenic zone Wait. Finally, the relationship between the seismogenic zone linearity and the focal zone scale is also derived, and a brief discussion is made.