摘要
为解决沙漠区工作方法问题,首先必须调查清楚区内的干扰波性质和规律。大量的试验工作表明,在干扰波试验的记录上,我们可以按优势波分为三个区域:(1)面波和直达波(“G+P”)区;(2)浅折射和反射(“R+r”)区;(3)次生震源干扰区。每一个区都各自有其明显特点。分析的结果说明,任一片混乱的干扰波都可分解为不同类型的各种干扰,不仅可逐一识别它们,而且可了解它们的性质和规律,进而采取有效措施来削弱它们。必须指出,改善沙漠区资料的根本途径是在野外采取有效措施,以提高原始资料的信噪比,然后是在室内资料处理中做细致的工作。
Abstract
In order to decide the proper method which will adopt in desert, it is necessary to make clear the nature and the pattern of the interference waves at first.Lots of tests show that three regions could be drawn on the test records in line with the waves which are predominant over the others. They are as follows: (1) the region of surface and direct waves (the "G + P" region); (2) the region of shallow refraction and reflection (the "R + r" region) and (3) the region of secondary source interference.Every region has its own outstanding characteristics. Analysis shows that no matter how complicated the interference waves are, they could be decomposed into various interferences of different types. All of them could be distinguished from each other, their nature and pattern could also be recognized and realized. Therefore, if the effective measurements are adopted, all sorts of the above interferences could thus be eliminated and removed. But what should be pointed out here is that the essential ways of improving the field data is to adopt the effective measurements in the field to improve the signal-to-noise ratio, and then,make a careful data processing.
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