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本文简要地给出了1974年5月11日云南省永善—大关7.1级强震前(?)、(?)波平均速度比V_(p0)V_(s0)前兆异常变化的一些主要特性:(1)7.1级强震前八年零五个月期间波速比V_(p0)/V_(s0)明显减小;(2)V_(p0)/V_(s0)在异常过程开始之前达到一个极大值,在异常过程结束时又取同样的极大值;(3)经过长时期、大面积的减小之后,波速比V_(p0)/V_(s0)先在距震中较远的地区内回升,然后才在震中区内回升;(4)5级以上地震都发生在异常过程的初期及末期,且各自对应着波速比的临时短期增大;(5)波速异常区的定向与强震的震源机制间有一定的对应关系。文章对所得结果作了一些简单的讨论,并指出了在地震预报中的应用。
In this paper, we briefly present some main characteristics of the anomalous anomalies of the average velocity ratio of (V0) V0 (s0) before (?) And before the 7.1 magnitude earthquake of the Yongshan-Taguan, Yunnan, on May 11, : (1) The V (p0) / V0 (s0) decreases significantly during the eight years and five months before the 7.1 magnitude earthquake; (2) V_ (p0) / V_ (s0) reaches one before the onset of the anomalous process (3) After a long period and a large area decrease, the wave velocity ratio V p0 / V s0 is first in the area far away from the epicenter (4) All earthquakes above M5 occurred at the beginning and end of the anomaly, and each corresponding to a temporary short-term increase in wave velocity ratio; (5) Directional and strong There is a certain correspondence between the focal mechanism of the earthquake. The article made some simple discussions on the results and pointed out the application in earthquake prediction.