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仪器性能在地震多次复盖中,影响浅层资料效果有许多因素,其中有以下几个原因:第一、在叠加过程中,由于初至破坏带与浅层反射相干涉,破坏浅层反射同相轴。第二、由于浅层动校正量变化梯度大,校正后浅层反射波形随炮检距增大而发生严重畸变(图1),影响浅层叠加效果。第三、随着多次复盖排列的加长,目前模拟磁带回放仪的动校正量远远满足不了浅层的要求。为了叙述方便,我们把上述影响叠加效果的部位统称为“初至畸变”带。考虑到上述的原因,我们认为如果将“畸变带”切除,这样即能保证浅层参加叠
There are many factors that affect the effect of shallow data in the multi-coverage of an earthquake. First, during the superposition, due to the interference between the first-break zone and the shallow reflection, the shallow reflection Isotopes. Second, due to the large variation gradient of shallow motion correction, the shallow reflection waveform after correction is seriously distorted due to the increase of offset (Figure 1), which affects the superposition effect. Thirdly, with the longer arrangement of multiple coverings, the current dynamic correction of the analog tape playback device can not meet the shallow requirements far. For the convenience of description, we refer to the above parts that affect the superposition effect as the “first-arrival distortion” band. For the above reasons, we think that if the “distortion band” is cut off, so that can guarantee shallow participation stack