下行波的衰减规律符合指数衰减，但上升波的衰减并不符合这一规律。
Downward wave amplitude decay in negative exponential function, but the upward wave amplitude is not the case.
此外，本方法用于VSP资料上下行波分离方面也取得了比较好的效果。
In addition, good effect has achieved from the separation of up or down wave for the practical VSP data.
VSP资料的直达下行波能量强，信噪比高，为求取吸收参数提供了有利条件。
Direct downgoing wave in VSP data has strong energy and high signal-noise ratio, which favours the calculation of absorption para - meters.
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