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不适当采样所得之相干噪声,在野外地震记录上,与正确采样所得的反向散射噪声具有相似的特性。借助于炮点与检波器组合,利用野外的各种参数可以减小噪声。可是,噪声的分布在一个矿点内可能变化极大。最终将出现难以预测的噪声,并可按照检波器组合的间隔进行采样。本文在 F—K 平面图上对此作了分析,说明噪声是如何作为检波器组合长度与测点间距之间关系的函数,而混入野外记录中的。交互组合的检波器组合,从防止假频噪声的观点来看,其性能是符合要求的;但一般来说,由于下面将要讲到组合俘获效应
The coherent noise from improper sampling has similar characteristics to the backscattered noise from the correct sampling in field seismograms. With the combination of shots and geophones, various parameters in the field can be used to reduce noise. However, the distribution of noise can vary widely within a mine site. The result is unpredictable noise that can be sampled at geophone intervals. This paper analyzes this on the F-K plan and shows how noise is incorporated into the field record as a function of the relationship between the length of the detector assembly and the spacing of the measuring points. The performance of the interactively combined detector combinations is satisfactory from the point of view of preventing aliasing noise; however, in general, since the combined capture effect will be described below,