SH plane-wave reflection/transmission coefficients in isotropic, attenuating media

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F22%3A00548480" target="_blank" >RIV/67985530:_____/22:00548480 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985891:_____/22:00548480 RIV/00216208:11320/22:10452471

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/s10950-021-10052-x" target="_blank" >https://link.springer.com/article/10.1007/s10950-021-10052-x</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10950-021-10052-x" target="_blank" >10.1007/s10950-021-10052-x</a>

Jazyk výsledku

angličtina

Název v původním jazyce

SH plane-wave reflection/transmission coefficients in isotropic, attenuating media

Popis výsledku v původním jazyce

An attempt is made to extend the applicability of the weak-attenuation concept (WAC) to ray-theory computations. WAC allows an approximate evaluation of effects of attenuation on seismic-wave propagation in smoothly varying laterally inhomogeneous media encountered in most seismological studies. The goal is to find under which conditions WAC could be applicable to layered media. Specifically, if the use of WAC is necessary, under which conditions it can be used for the approximate evaluation of the reflection and transmission coefficients at interfaces separating attenuating media. It turns out that outside critical incidence regions, where the ray theory is not applicable, the effects of attenuation on the reflection and transmission are negligible in comparison with effects of attenuation on wave propagation inside layers. Despite it, the approximate formulae for reflection and transmission coefficients including effects of attenuation are derived and presented. For better insight and simplicity, effects of attenuation on SH plane-wave coefficients at interfaces separating homogeneous, attenuating isotropic half-spaces are studied. The coefficients are expressed in the form of the sum of coefficients in a reference elastic medium plus a perturbation due to weak attenuation. The study is based on the assumption of the validity of the correspondence principle despite indications of its inapplicability in some situations. A fixed frequency is considered. A basic role in the evaluation of coefficients is played by slowness vectors of incident and transmitted waves. They are required to satisfy constraints resulting from the corresponding equation of motion, Snell's law and radiation condition. The resulting formulae for coefficients are singular for the angles corresponding to critical incidence in the reference elastic medium.

Název v anglickém jazyce

SH plane-wave reflection/transmission coefficients in isotropic, attenuating media

Popis výsledku anglicky

An attempt is made to extend the applicability of the weak-attenuation concept (WAC) to ray-theory computations. WAC allows an approximate evaluation of effects of attenuation on seismic-wave propagation in smoothly varying laterally inhomogeneous media encountered in most seismological studies. The goal is to find under which conditions WAC could be applicable to layered media. Specifically, if the use of WAC is necessary, under which conditions it can be used for the approximate evaluation of the reflection and transmission coefficients at interfaces separating attenuating media. It turns out that outside critical incidence regions, where the ray theory is not applicable, the effects of attenuation on the reflection and transmission are negligible in comparison with effects of attenuation on wave propagation inside layers. Despite it, the approximate formulae for reflection and transmission coefficients including effects of attenuation are derived and presented. For better insight and simplicity, effects of attenuation on SH plane-wave coefficients at interfaces separating homogeneous, attenuating isotropic half-spaces are studied. The coefficients are expressed in the form of the sum of coefficients in a reference elastic medium plus a perturbation due to weak attenuation. The study is based on the assumption of the validity of the correspondence principle despite indications of its inapplicability in some situations. A fixed frequency is considered. A basic role in the evaluation of coefficients is played by slowness vectors of incident and transmitted waves. They are required to satisfy constraints resulting from the corresponding equation of motion, Snell's law and radiation condition. The resulting formulae for coefficients are singular for the angles corresponding to critical incidence in the reference elastic medium.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10507 - Volcanology

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

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

Journal of Seismology

ISSN

1383-4649

e-ISSN

1573-157X

Svazek periodika

26

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

20

Strana od-do

15-34

Kód UT WoS článku

000721400200001

EID výsledku v databázi Scopus

2-s2.0-85119876397