Waveform inversion of shallow seismic refraction data using hybrid heuristic search method
Waveform inversion of shallow seismic refraction data using hybrid heuristic search method
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DOI：
10.1071/eg08113
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发表时间：
2009-03
影响因子：
0.9
通讯作者：
M. Takekoshi;H. Yamanaka
中科院分区：
文献类型：
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作者：
M. Takekoshi;H. Yamanaka
本文提出了一种利用浅层地震折射波资料进行波形反演的方法，以确定浅层土壤的二维非均匀横波剖面。在该方法中，使用2.5D方程来模拟SH波在二维介质中的传播。用交错网格有限差分近似求解该方程，空间上为4阶，时间上为2阶，以计算合成波。的失配，定义使用计算和观察到的波形之间的差异，最小化与混合启发式搜索方法。我们参数化的二维地下结构模型与块具有不同的深度边界，和S波速度在每个块。利用带有白色噪声的合成SH波资料，对一个含有盲层和不规则界面的模型进行了数值试验。利用地表地震折射波资料，可以在合理的计算时间内重建出含有盲层的构造。
We propose a waveform inversion method for SH-wave data obtained in a shallow seismic refraction survey, to determine a 2D inhomogeneous S-wave profile of shallow soils. In this method, a 2.5D equation is used to simulate SH-wave propagation in 2D media. The equation is solved with the staggered grid finite-difference approximation to the 4th-order in space and 2nd-order in time, to compute a synthetic wave. The misfit, defined using differences between calculated and observed waveforms, is minimised with a hybrid heuristic search method. We parameterise a 2D subsurface structural model with blocks with different depth boundaries, and S-wave velocities in each block. Numerical experiments were conducted using synthetic SH-wave data with white noise for a model having a blind layer and irregular interfaces. We could reconstruct a structure including a blind layer with reasonable computation time from surface seismic refraction data.