层状介质瑞利面波的波形模拟研究

A Study of Rayleigh Waveform Simulation of Multilayered Media

对地质模型进行瑞利面波正演计算可以模拟地震波在地下介质中的传播规律,以明确地质体瑞利面波记录特征。在瑞利面波资料解释过程中,对地质模型的正演计算可以对解释结果进行验证,并能提供地下地质体地震波岩石物理响应特性。本文首先根据地震波叠加原理,模拟计算3种常见速度结构地层条件下的瑞利面波波形记录;然后分析讨论了不同速度和厚度结构地层的高阶和基阶面波的能量分布和面波波形记录特征,研究结果证明由于地层速度和厚度结构的差异,各阶模态面波的能量分布不同,形成特征不同的波形记录。模拟面波波形能够帮助判断地层速度特征、指导野外施工参数设计等工作。在面波勘探工作中,具有重要的实用价值。

Geological model of Rayleigh＇s forward calculation can simulate the propagating pattern of the seismic wave in the underground media so as to make clear the features of the geological Rayleigh record. In the Rayleigh＇s data interpretation process, the forward calculation of the geological model can be made to verify the result of the interpretation and also can provide the response features of the seismic wave rock physics underground. In this paper,it makes simulating calculation on Rayleigh waveform records of the three common velocity structures. The result indicates that the distribution of the modal surface waveforms is different and the features of waveform records are different due to the differences of the stratum velocity and thickness.