In data processing of expanding spread, output frequency is normally affected by earth filtering and NMO stretching and decreases as offset increases,which makes high resolution of final data impossible.

• 在进行长排列地震资料处理时,由于大地滤波和动校拉伸等因素的影响,存在随炮检距增大频率降低的现象,难以获得高分辨率的资料处理结果。