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在一些隆起区的水平叠加时间剖面上,常常出现倾斜短同相轴,呈条带分布;而在单炮记录的远炮检距位置上,于正常反射波之后,出现视速度较低的同相轴。经计算确认,这些是转换波。转换波的存在,严重地降低了记录的信噪比。消除这类转换波的措施有:1.资料采集时要有足够的排列长度和覆盖次数;2.处理时运用叠后二维滤波和多次波消去法。文中给出的实际资料,充分地证明了这样做是行之有效的。
In some horizontal superimposed time profiles of uplift, the diphosphenes are often distributed in a strip-like distribution. In the far-offset recorded positions of single shots, after the normal reflected waves, the events with lower apparent velocities occur . It is calculated that these are converted waves. The existence of converted waves severely reduces the recorded signal-to-noise ratio. The elimination of such conversion wave measures are: 1 data acquisition should have sufficient length and coverage of the arrangement; 2 processing using the post-stack two-dimensional filtering and multiple elimination method. The actual information given in the article fully proves that this is effective.