Joint traveltime, waveform, and waveform envelope inversion for near-surface imaging

Joint traveltime, waveform, and waveform envelope inversion for near-surface imaging
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用于近地表成像的联合走时、波形和波形包络反演

DOI:
10.1190/geo2016-0356.1
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发表时间:
2017-05
期刊:
影响因子:
3.3
通讯作者:
Zhang Jie
Zhang Jie
中科院分区:
地球科学2区
文献类型:
--
作者:
Liu Zhiyang;Zhang Jie

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没有大偏移距的初至走时限制了非常浅的速度,波形包络表示低频数据,高频波形本身包括有关结构细节的信息。提出了一种走时、波形和波形包络联合反演方法。通过反演三种类型的数据,我们能够恢复低和高波数结构,并减轻波形反演中的周跳问题。走时和射线路径的计算速度很快。大部分的计算工作集中在处理波形和波形包络。JTWE同时反向传播波形残差和包络残差以计算模型更新梯度。这种同步反向传播策略确保了JTWE的计算成本与单独反转波形的成本相似。在合成实验中,我们确定JTWE减轻了...
ABSTRACTThe first-arrival traveltimes without large offsets constrain very shallow velocities, the waveform envelope presents low-frequency data, and the high-frequency waveform itself includes information regarding structural details. We have developed a joint traveltime, waveform, and waveform envelope (JTWE) inversion method for inverting near-surface velocity structures. By inverting three types of data, we are able to recover the low- and high-wavenumber structures and mitigate the cycle-skipping problem in waveform inversion. The calculation of traveltimes and raypaths is fast. Most of the computation effort is focused on dealing with the waveform and waveform envelope. JTWE backward propagates the waveform residual and envelope residual simultaneously to calculate the model updating gradients. This simultaneous backward-propagation strategy ensures that the computational cost of JTWE is similar to the cost of inverting waveform alone. In a synthetic experiment, we determine that JTWE mitigates the ...
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