高铁地震信号直达波波形反演建模

高铁地震信号由高速行驶的高铁列车与铁轨挤压形变后产生,具有频带宽、低频强、重复性好等优点.如何利用高铁地震信号进行地下介质重构,尚处于前期探索阶段.全波形反演建模技术是目前地球物理领域建模精度较高的方法之一,但其需要低频数据才能保证结果的稳定收敛,因此利用全波形反演对高铁地震信号进行近地表建模及属性变化监测和灾害预警具有独特优势.本文通过对高铁地震信号的分析,研究了高铁地震的理论震源信号和基于桥墩的离散震源信号,并通过模型测试实现了利用高铁地震信号的全波形反演建模及属性变化监测.

FWI of high-speed-train seismic first arrival signal

The high-speed-train seismic signal is generated by deformation extrusion between the high-speed-train and high-speed-railway, which has the advantages of wide frequency bandwidth, strong low frequency and good repeatability. How to use high-speed-train seismic signal to reconstruct underground media is still under study. The full waveform inversion (FWI) is one of the most accurate modeling methods in geophysics, which needs low frequency data to ensure its stable convergence. Therefore, it has a unique advantage to use this signal to perform FWI for near surface modeling, attribute change monitoring and disaster warning. Through the analysis of high-speed-train seismic signal, the theoretical high-speed-train seismic source signal and discrete high-speed-train seismic source signal based on bridge piers are studied, and the model FWI and attribute change monitoring are realized by using the high-speed-train seismic signal.