地震回折波法的电算解释方法

在以往运用地震回折波法进行资料解释分析时，都沿用手工做切线的方法，此法受人为因素影响，解释精度不高，且不利于全测区的资料系统分析，解释速度亦太慢，而用电算解释方法可较好地解决上述问题。由完全连续介质回折波法的原理，可找出电算解释方法的前提条件是求时距曲线的幅值、即Ｍ、Ｋ值，通过改变Ｍ、Ｋ值，对所得曲线正演拟合，直到拟合的方差小于规定值为止。运用该法解释冷水滩水电站某地震剖面时取得良好效果。

Computer processing of data from seismic echo refraction method

In the past, manual method of drawing tangent was adopted, when data from seismic echo refraction method were used to interpret stratigraphic characteristics. This method has poor accuracy of interpretation, because of effects of man-made factors, and would not be convenient for systematically analysing data in a whole survey area. Also, the method has too slow speed of interpretation. However, the above problems may be better resolved, provided that these data are processed by computer. From the time-distance equation for seismic echo refraction method with completely continuous medium, it may be seen that the amplitude and shape of a time-distance curve are dependent on values of M and K in the equation. By changing values of M and K, a fitting curve may be derived from these data. In this paper, the positively evolutional fitting method is used. The fitting work continues until the mean square deviation less than the stipulated value. The computer method has been applied to interpreting a seismic profile at Lengshuitan Hydropower Station. A good result of interpretation has been obtained.