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本文详细讨论了利用P_n波走时资料对莫霍面的慢度场层析成像的方法与原理。在地震波慢度场的非均匀分布相对背景场为一挠动量的情况下,其走时为背景场分量与挠动场分量的线性迭加,因此,从观测走时中可提取出相对背景场的异常量。对走时异常分量的表达式作适当的变换即可得出拉冬变换形式,运用反投影重建或拉冬逆变换,可以直接求出慢度场的分布。
This paper discusses in detail the method and principle of slow-field tomography of Moho using P-wave travel time-history data. Under the condition that the relative background field is a torsional moment in the non-uniform distribution of the seismic wave slowness field, the travel time is the linear superposition of the background field component and the torsional dynamic field component. Therefore, the relative background field anomaly can be extracted from the observation travel time the amount. Appropriate transformation of the expression of the anomalous component of travel time can be used to draw the Rhodope transform form, and the distribution of the slowness field can be directly obtained by using back projection reconstruction or Laplace inverse transformation.