In a vertical seismic profile, offset is the horizontal distance between the source and the wellhead or the surface projection of the receiver in the case of a deviated well.
在垂直地震剖面中，偏移距是震源和井口之间的水平距离。在斜井的情况下，偏移距是震源和检波器在地表的投影之间的距离。
The results indicate that influenced by higher modes and the source, the effective phase velocity is related to frequency as well as the distance from the source.
结果显示在高模态及振源影响下表面波有效相速度不仅与频率有关，而且与传播距离有关。
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