Joint traveltime, waveform and waveform envelope inversion for the near-surface imaging
Joint traveltime, waveform and waveform envelope inversion for the near-surface imaging
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DOI：
10.1190/segam2016-13850307.1
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Zhiyang Liu;Jie Zhang
中科院分区：
文献类型：
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作者：
Zhiyang Liu;Jie Zhang
初至旅行时约束了浅层速度，波形包络呈现低频数据，而高频数据的波形本身应该包含大量的结构细节信息。本文提出了一种走时、波形和波形包络联合反演方法（JTWE），用于反演近地表速度结构。通过对三种类型的数据进行反演，我们能够恢复低波数和高波数结构，避免了波形反演中的跳周问题。走时和射线路径的计算速度很快。主要计算波形和波形包络。JTWE同时反向传播FWI残差和包络残差。这种反向传播策略确保了JTWE的计算成本降低到仅反转波形的成本。我们证明了JTWE的有效性，通过应用该方法的合成和现场数据。
The first-arrival traveltimes constrain very shallow velocities, waveform envelope presents low-frequency data, and waveform itself with high-frequency data should include information of tremendous structure details. We propose a joint traveltime, waveform, and waveform envelope inversion method (JTWE) for inverting the near surface velocity structures. By inverting three types of data, we are able to recover both low-wavenumber and highwavenumber structures and avoid the cycle-skipping problem in waveform inversion. The calculation of traveltimes and raypaths is fast. The main calculation is about waveform and waveform envelope. JTWE backward propagates both FWI residual and envelope residual simultaneously. This backward propagation strategy ensures that the computational cost of JTWE is reduced to the cost of inverting waveform alone. We demonstrate the effectiveness of JTWE by applying the method to both synthetics and field data.