Weak-anisotropy approximation of P-wave reflection coefficient in anisotropic media of arbitrary symmetry and tilt

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F22%3A00556049" target="_blank" >RIV/67985530:_____/22:00556049 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/22:10452469

Výsledek na webu

<a href="https://library.seg.org/doi/10.1190/geo2021-0471.1" target="_blank" >https://library.seg.org/doi/10.1190/geo2021-0471.1</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1190/geo2021-0471.1" target="_blank" >10.1190/geo2021-0471.1</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Weak-anisotropy approximation of P-wave reflection coefficient in anisotropic media of arbitrary symmetry and tilt

Popis výsledku v původním jazyce

Applicability of the approximate expression for the P-wave reflection coefficient at a weak-contrast reflector separating two weakly anisotropic half-spaces of arbitrary symmetry is extended to media of arbitrary symmetry and tilt. The reflection coefficient consists of the approximate PP reflection coefficient at a weak-contrast interface separating two reference isotropic half-spaces and a correction term due to anisotropy. Along an arbitrarily chosen profile, the 'isotropic term depends on the density and P- and S-wave contrasts, the correction term depends linearly on the contrasts of four profile weak-anisotropy (WA) parameters specifying anisotropy along the profile. In addition, both terms depend on the polar angle of incidence. In each half-space, the four profile WA parameters can be expressed as a linear combination of twelve of twenty one global WA parameters specifying anisotropy of the half-space. Coefficients of this linear combination are functions of the azimuth of the profile. WA parameters are a generalization of Thomsen parameters to arbitrary anisotropy, and represent an alternative to twenty one independent elements of the stiffness tensor. WA parameters can be used for the approximation of other related concepts as the reflection moveout or the geometrical spreading. Presented tests illustrate high accuracy and flexibility of the proposed formula for the P-wave reflection coefficient. They also show that very accurate results can be obtained for contrasts and anisotropy, which cannot be considered weak.

Název v anglickém jazyce

Weak-anisotropy approximation of P-wave reflection coefficient in anisotropic media of arbitrary symmetry and tilt

Popis výsledku anglicky

Applicability of the approximate expression for the P-wave reflection coefficient at a weak-contrast reflector separating two weakly anisotropic half-spaces of arbitrary symmetry is extended to media of arbitrary symmetry and tilt. The reflection coefficient consists of the approximate PP reflection coefficient at a weak-contrast interface separating two reference isotropic half-spaces and a correction term due to anisotropy. Along an arbitrarily chosen profile, the 'isotropic term depends on the density and P- and S-wave contrasts, the correction term depends linearly on the contrasts of four profile weak-anisotropy (WA) parameters specifying anisotropy along the profile. In addition, both terms depend on the polar angle of incidence. In each half-space, the four profile WA parameters can be expressed as a linear combination of twelve of twenty one global WA parameters specifying anisotropy of the half-space. Coefficients of this linear combination are functions of the azimuth of the profile. WA parameters are a generalization of Thomsen parameters to arbitrary anisotropy, and represent an alternative to twenty one independent elements of the stiffness tensor. WA parameters can be used for the approximation of other related concepts as the reflection moveout or the geometrical spreading. Presented tests illustrate high accuracy and flexibility of the proposed formula for the P-wave reflection coefficient. They also show that very accurate results can be obtained for contrasts and anisotropy, which cannot be considered weak.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10507 - Volcanology

Projekt

<a href="/cs/project/GA20-06887S" target="_blank" >GA20-06887S: Seismické vlny v nehomogenních anizotropních viskoelastických prostředích</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Geophysics

ISSN

0016-8033

e-ISSN

1942-2156

Svazek periodika

87

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

"C39"-"C48"

Kód UT WoS článku

000793467000004

EID výsledku v databázi Scopus

2-s2.0-85125855544