Seismic waves in complex 3-D structures. Report 23

0423493 - GFÚ 2014 CZ eng M - Monography Chapter
Farra, V. - Pšenčík, Ivan
Moveout approximations for P- and SV-waves in dip-constrained transversely isotropic media.
Seismic waves in complex 3-D structures. Report 23. Prague: Charles University, 2013, s. 105-119
R&D Projects: GA ČR(CZ) GAP210/11/0117
Institutional support: RVO:67985530
Keywords : moveout formula * dip-constrained transverse isotropy * dipping reflector * P and S waves
Subject RIV: DC - Siesmology, Volcanology, Earth Structure

We generalize the P- and SV-wave moveout formulas obtained for transversely isotropic media with vertical axes of symmetry (VTI), based on the weak-anisotropy approximation. We generalize them for 3D dip-constrained transversely isotropic (DTI) media. A DTI medium is a transversely isotropic medium whose axis of symmetry is perpendicular to a dipping reflector. The formulas are derived in the plane defined by the source-receiver line and the normal to the reflector. In this configuration, they can be easily obtained from the corresponding VTI formulas. It is only necessary to replace the expression for the normalized offset by the expression containing the apparent dip angle. The final results apply to general 3D situations, in which the plane reflector may have arbitrary orientation, and the source and the receiver may be situated arbitrarily in the DTI medium. The accuracy of the proposed formulas is tested on models with varying dip of the reflector, and for several orientations of the horizontal source-receiver line with respect to the dipping reflector.
Permanent Link: http://hdl.handle.net/11104/0229634