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横向均匀介质可由若干水平分层足够好地逼近,本文引入零厚度层来描述成层介质,从而建立了回折波、反射波、首波和直达波统一的时距关系以及地震走时随模型参数变化的公式。本文详细讨论了水平分层介质里地震走时曲线的特征,合成地震走时的试验表明了由地震走时,用阻尼最小二乘法可以成功地反演速度模型参数,所反演的模型含有速度梯度层,也可以含有低速层。
Horizontal homogeneous media can be approached well enough by some horizontal stratification. In this paper, the zero thickness layer is introduced to describe the stratified medium, and the time-lapse relationship between return wave, reflected wave, the first wave and the direct wave and the variation of seismic travel time with the model parameters are established The formula. In this paper, the characteristics of seismic travel time histories in horizontal layered media are discussed in detail. Experiments on synthetic travel time show that the parameters of velocity model can be successfully retrieved by damped least square method. The retrieved model contains velocity gradient layer, It may also contain a low velocity layer.