中文摘要：

基于反射率法理论地震图算法,提出PmP波与Pn波理论和实际振幅比曲线拟合算法,获得莫霍细结构。试验表明,一级间断面型与正速度梯度型莫霍结构振幅比曲线形态相似,均为上凹,但数值上前者为后者的两倍以上;而高低速互层型结构的振幅比曲线呈下凹状态,3种曲线差别显著,表明PmP波与Pn波振幅比曲线对不同莫霍结构的分辨是敏感、有效的。

英文摘要：

A new approach based on theoretical reflectivity seismograms gainning Moho structure was proposed in the paper. The ratio of PmP and Pn＇s wave amplitude and adjusts model were used to fit the predicted PmP / Pn curve with measured PmP / Pn curve. Experimental tests indicate that there exists significant difference among the theoretical PmP / Pn curves of Single Layer structure,Gradient Layers structure,layers stacked with high and low velocities structure. SL structure is similar to GLS structure＇s PmP / Pn curve in the shape,however,the value of the former is roughly twice that of the latter,and HLVS structure＇s PmP / Pn curve appears in concave shape. All shows that this method is sensitive to Moho structure and can be used to identify effectively of Moho structure.