Wave-equation tomography by beam focusing |

**Biondo Biondi**

**Biondo Biondi**

Velocity can be estimated using a
wave-equation operator by maximizing
an objective function that measures
the flatness of the crosscorrelation computed between
a source wavefield and a receiver wavefield.
The proposed objective function
depends on the parameters of a residual moveout applied
to the computed correlation.
It is composed of two terms:
the first term maximizes the energy of the stack
computed on local subarrays as a function of the local curvature.
The second term maximizes the power of the stack computed
globally as a function of time shifts applied to
the stacks of the local subarrays.
The first terms is essential to assure
global convergence in presence of large velocity errors.
The second term plays a role in estimating
localized velocity anomalies.
Numerical examples of computation of the gradients
of the proposed objective function
confirm its potential for velocity estimation.

- Introduction
- Theory

- Numerical computation of search directions

- Conclusions
- Bibliography
- APPENDIX A
- :
- About this document ...

Wave-equation tomography by beam focusing |

2010-05-19