P-wave reflection-moveout approximation for horizontally layered media of tilted weak-to-moderate orthorhombic symmetry

0524541 - GFÚ 2021 RIV NL eng J - Článek v odborném periodiku
Farra, V. - Pšenčík, Ivan
P-wave reflection-moveout approximation for horizontally layered media of tilted weak-to-moderate orthorhombic symmetry.
Journal of Applied Geophysics. Roč. 178, July (2020), č. článku 104057. ISSN 0926-9851. E-ISSN 1879-1859
Institucionální podpora: RVO:67985530
Klíčová slova: P-wave moveout * orthorhombic symmetry * layered structures
Obor OECD: Volcanology
Impakt faktor: 2.121, rok: 2020
Způsob publikování: Omezený přístup
https://www.sciencedirect.com/science/article/pii/S0926985120300343

An approximate nonhyperbolic P-wave moveout formula applicable to horizontally layered media of weak-tomoderate
orthorhombic or higher-symmetry anisotropy of arbitrary orientation is presented and tested.
Weak-anisotropy approximation is used for the derivation of the formula, in which the square of the reflection
traveltime is expanded in terms of weak-anisotropy (WA) parameters specifying the anisotropy of the layers.
Due to the use of the weak-anisotropy approximation, the proposed formula is applicable to any offset. Its accuracy
decreases with increasing strength of anisotropy. The relation between traveltimes and WA parameters in
the formula is transparent and relatively simple. For any offset along an arbitrarily chosen single surface profile,
the formula depends in each layer on its thickness, on the auxiliary reference P-wave velocity, on, atmost, sixWA
parameters describing P-wave orthorhombic or higher-symmetry anisotropy, and on three Euler angles specifying
the orientation of symmetry elements in the layer. Performed tests indicate that the maximum relative
traveltime error does not exceed 2.5% for P-wave anisotropy about 25%. Often, the errors are considerably lower.
Trvalý link: http://hdl.handle.net/11104/0308886