Specialization: 010700/07 Physics of the Earth and planets
Program: 10 Waves in elastic media
Head of laboratory: Prof. B. Kashtan
Earth’s physics department
Scientific adviser: Prof. B. Kashtan
Reviewer: Dr. Y. Kiselev
Diffraction traveltime approximation for an anisotropic homogeneous
elastic medium
Pronevich Anna
Diffraction play an important part of seismic processing since they provide
the high-resolution seismic imaging. The aim of the study was to obtain a new
approximation of the diffraction response for a homogeneous anisotropic medium.
The new traveltime expression is formulated as a double-square-root that
allows to accurately and reliably describe diffraction traveltimes. In the homogeneous anisotropic medium, the location of the diffraction apex might be shifted
with respect to the diffractor location. The magnitude of the shift depends on
the angle of emergence of the fastest ray emitted from the diffractor. In general,
new approximation depends on four independent parameters: the emergence angle
of the fastest ray, the ray velocity along this ray, and first and second-order
derivatives of the ray velocity with respect to the ray angle.
The effectiveness of new diffraction response approximation was evaluated
by comparing the numerically computed traveltime with exact values for different
models. The application of this method to synthetic data with different types of
transverse anisotropy shows promising results.
The list of the publication:
1. Pronevich A., S. Dell, Kashtan B. Diffraction traveltime approximation
for an homogeneous anisotropic elastic medium // Problems of geophysics,
accepted.
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2. Anna Pronevich, Sergius Dell, Boris Kashtan and Dirk Gajewski Diffraction
traveltime approximation for anisotropic media // Geophysics. To be published
in 2013. Jule-August.
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