| Title | Source-independent full wavefield converted-phase elastic migration velocity analysis |
| Publication Type | Journal Article |
| Year of Publication | 2015 |
| Authors | Shabelansky, AH, Malcolm, AE, Fehler, M, Shang, X, Rodi, W |
| Journal | Geophysical Journal International |
| Volume | 200 |
| Issue | 2 |
| Pagination | 952 - 966 |
| Date Published | Jan-02-2015 |
| ISSN | 0956-540X |
| Keywords | Body waves, Computational seismology, Inverse theory, Seismic tomography, Wave propagation |
| Abstract | Converted phase (CP) elastic seismic signals are comparable in amplitude to the primary
signals recorded at large offsets and have the potential to be used in seismic imaging and
velocity analysis. We present an approach for CP elastic wave equation velocity analysis
that does not use source information and is applicable to surface-seismic, microseismic,
teleseismic and vertical seismic profile (VSP) studies. Our approach is based on the crosscorrelation
between reflected or transmitted PP and CP PS (and/or SS and CP SP) waves
propagated backward in time, and is formulated as an optimization problem with a differential
semblance criterion objective function for the simultaneous update of both P- and S-wave
velocity models. The merit of this approach is that it is fully data-driven, uses full waveform
information, and requires only one elastic backward propagation to form an image rather
than the two (one forward and one backward) propagations needed for standard reverse-time
migration. Moreover, as the method does not require forward propagation, it does not suffer
from migration operator source aliasing when a small number of shots are used. We present a
derivation of the method and test it with a synthetic model and field micro-seismic data. |
| URL | http://gji.oxfordjournals.org/cgi/doi/10.1093/gji/ggu450 |
| DOI | 10.1093/gji/ggu450 |
| Short Title | Geophysical Journal International |
