Unknown
In:
Geophys. Res. Lett., Kunming, China, 3-4, vol. 31, no. 7, pp. 1-5, pp. L07612,
(ISSN: 1340-4202)
Publication Date:
2004
Description:
Seismic tomography traditionally inverts for velocity field on a regularly
spaced and fixed-in-space model grid. Such an approach is not able to adequately
describe pinchouts or wedge-shaped velocities as commonly seen at basin boundaries,
faulted rock beds, and back-arc mantle wedges. A regularly spaced model grid also
requires the use of a large number of model variables. This paper shows a different
approach called deformable layer tomography (DLT) to directly invert for velocity
interfaces. The use of thickness-varying layers allows a much smaller number of model
variables for the DLT than the regularly spaced model grid. In the DLT the geologic
framework and known velocity range are adopted into the initial reference model, and the
best-data-fitting geometry of the velocity interfaces is determined, as illustrated by
synthetic and field data examples.
Keywords:
Seismics (controlled source seismology)
;
Applied geophysics
;
Layers
;
Velocity analysis
;
Modelling
;
0915
;
Exploration
;
Geophysics:
;
Downhole
;
methods
;
0935
;
Seismic
;
methods
;
3260
;
Mathematical
;
Geophysics:
;
Inverse
;
theory
;
7260
;
Seismology:
;
Theory
;
and
;
modeling
;
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