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Joint Traveltime and Waveform Envelope Inversion for Near-surface Imaging.
- Source :
-
Pure & Applied Geophysics . Mar2017, Vol. 174 Issue 3, p1269-1289. 21p. - Publication Year :
- 2017
-
Abstract
- In the linearized seismic full waveform inversion (FWI), it is well known that a good initial model is needed to avoid cycle-skipping issue, especially when the low-frequency components of data are lacking. To solve the problem, we develop a joint first-arrival traveltime and early arrival envelope inversion method (JTE) to build a good near-surface velocity model with low-wavenumber components. The JTE method combines the robustness of nonlinear traveltime inversion and the low-frequency information embedded in the waveform envelope. In two synthetic experiments, we confirm that traveltime inversion constrains the top near-surface velocity structures tightly, while the envelope inversion recovers the low-wavenumber structures with low-velocity objects or layers. Using the results of JTE as starting models, we find that FWI can produce accurate solutions for complex numerical models. In a real-data example, JTE followed by FWI resolves a near-surface velocity model to improve statics corrections for the subsurface stacking image. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00334553
- Volume :
- 174
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Pure & Applied Geophysics
- Publication Type :
- Academic Journal
- Accession number :
- 121413113
- Full Text :
- https://doi.org/10.1007/s00024-016-1460-3