Seismic envelope inversion: reduction of local minima and noise resistance
Seismic envelope inversion: reduction of local minima and noise resistance
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DOI：
10.1111/1365-2478.12208
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发表时间：
2015-05
影响因子：
2.6
通讯作者：
Jingrui Luo;R. Wu
中科院分区：
文献类型：
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作者：
Jingrui Luo;R. Wu
波形反演在反演长波长背景结构方面遇到了严峻的挑战。我们建议使用包络反演来恢复模型的大尺度分量。利用包络反演恢复的大尺度背景作为新的起始模型，可以得到比常规全波形反演更好的结果。通过比较包络反演和常规波形反演中失配泛函的结构，我们发现包络反演可以大大减少局部极小问题。与传统的全波形反演相比，包络反演和波形反演的组合可以提供更忠实和准确的最终结果，而几乎没有额外的计算成本。并测试了包络反演对高斯噪声和地震干扰噪声的抗噪能力。结果表明，包络反演对高斯噪声不敏感，对地震干扰噪声也有一定的不敏感性。这表明该方法的鲁棒性及其对噪声数据的潜在用途。
Waveform inversion met severe challenge in retrieving long‐wavelength background structure. We have proposed to use envelope inversion to recover the large‐scale component of the model. Using the large‐scale background recovered by envelope inversion as new starting model, we can get much better result than the conventional full waveform inversion. By comparing the configurations of the misfit functional between the envelope inversion and the conventional waveform inversion, we show that envelope inversion can greatly reduce the local minimum problem. The combination of envelope inversion and waveform inversion can deliver more faithful and accurate final result with almost no extra computation cost compared to the conventional full waveform inversion. We also tested the noise resistance ability of envelope inversion to Gaussian noise and seismic interference noise. The results showed that envelope inversion is insensitive to Gaussian noise and, to a certain extent, insensitive to seismic interference noise. This indicates the robustness of this method and its potential use for noisy data.