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Suppressing non-Gaussian noises with scaled receiver wavefield for reverse-time migration: comparison of different approaches.
- Source :
- Geophysical Prospecting; Jul2013, Vol. 61 Issue 4, p761-770, 10p, 1 Diagram, 9 Graphs
- Publication Year :
- 2013
-
Abstract
- ABSTRACT Numerical implementation of the gradient of the cost function in a gradient-based full- waveform inversion (FWI) is essentially a migration operator used in wave equation migration. In FWI, minimizing different data residual norms results in different weighting strategies of data residuals at receiver locations prior to back-propagation into the medium. In this paper, we propose different scaling methods to the receiver wavefield and compare their performances. Using time-domain reverse-time migration (RTM), we show that compared to conventional algorithms, this type of scaling is able to significantly suppress non-Gaussian noise, i.e., outliers. Our tests also show that scaling by its absolute norm produces better results than other approaches. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00168025
- Volume :
- 61
- Issue :
- 4
- Database :
- Complementary Index
- Journal :
- Geophysical Prospecting
- Publication Type :
- Academic Journal
- Accession number :
- 88287243
- Full Text :
- https://doi.org/10.1111/1365-2478.12016