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APPLIED GEOPHYSICS  2018, Vol. 15 Issue (2): 261-270    DOI: 10.1007/s11770-018-0669-6
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Multiscale full-waveform inversion based on shot subsampling
Shi Cai-Wang1,2,3 and He Bing-Shou1,2,3
1. Ocean University of China, Qingdao 266100, China.
2. Evaluation and Detection Technology Laboratory of Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China.
3. Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Qingdao 266100, China.
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Abstract Conventional full-waveform inversion is computationally intensive because it considers all shots in each iteration. To tackle this, we establish the number of shots needed and propose multiscale inversion in the frequency domain while using only the shots that are positively correlated with frequency. When using low-frequency data, the method considers only a small number of shots and raw data. More shots are used with increasing frequency. The random-in-group subsampling method is used to rotate the shots between iterations and avoid the loss of shot information. By reducing the number of shots in the inversion, we decrease the computational cost. There is no crosstalk between shots, no noise addition, and no observational limits. Numerical modeling suggests that the proposed method reduces the computing time, is more robust to noise, and produces better velocity models when using data with noise.
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Key wordsWaveform   inversion   frequency   shot subsampling     
Received: 2017-02-08;
Fund:

The research was financially supported by the Fundamental Research Funds for the Central Universities (No. 201822011), the National Natural Science Foundation of China (No. 41674118) and the National Science and Technology Major Project (No. 2016ZX05027002).

Cite this article:   
. Multiscale full-waveform inversion based on shot subsampling[J]. APPLIED GEOPHYSICS, 2018, 15(2): 261-270.
 
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