Multifrequency viscoacoustic modeling and inversion
- Univ. of Texas, Richardson, TX (United States). Center for Lithospheric Studies
Modeling and inversion for seismic wavefields that include the attenuation and phase dispersion effects of Q can be implemented in the space-frequency domain. The viscoacoustic wave equation is solved by the moment method. Absorbing boundary conditions are implemented by reducing Q and adjusting the complex velocity (to reduce Q-dependent reflectivity) in a zone around the edges of the model grid. Nonlinear inversion is performed using iterative linearized inversions. The residual wavefield at a single frequency is back projected, using an anticausal Green`s function, along the viscoacoustic wavepath in an estimate of the model, to get updated velocity and Q distributions. The model obtained from data at one frequency becomes input to inversion at the next higher frequency. Velocity and Q are inverted simultaneously as they are interdependent. Both modeling and inversion algorithms are successfully tested with synthetic examples; data at two or three frequencies are sufficient to produce reliable images from noise-free synthetic data.
- OSTI ID:
- 404394
- Journal Information:
- Geophysics, Vol. 61, Issue 5; Other Information: PBD: Sep-Oct 1996
- Country of Publication:
- United States
- Language:
- English
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