P-wave reflection-moveout approximation for horizontally layered media of arbitrary moderate anisotropy

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F20%3A00523729" target="_blank" >RIV/67985530:_____/20:00523729 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11320/20:10421793

Result on the web

<a href="https://library.seg.org/doi/full/10.1190/geo2019-0232.1" target="_blank" >https://library.seg.org/doi/full/10.1190/geo2019-0232.1</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1190/GEO2019-0232.1" target="_blank" >10.1190/GEO2019-0232.1</a>

Result language

angličtina

Original language name

P-wave reflection-moveout approximation for horizontally layered media of arbitrary moderate anisotropy

Original language description

We present an approximate nonhyperbolic P-wave moveout formula applicable to horizontally layered media of moderate or weak anisotropy of arbitrary symmetry and orientation. Anisotropy symmetry and its orientation may differ from layer to layer. Instead of commonly used Taylor-series expansion of the square of the reflection traveltime in terms of the square of the offset, we use the weak-anisotropy approximation, in which the square of the reflection traveltime is expanded in terms of weak-anisotropy (WA) parameters. The resulting formula is simple, and it provides a transparent relation between the traveltimes and WA parameters. Along an arbitrarily chosen single surface profile, it depends, in each layer, on the thickness of the layer, on the reference P-wave velocity used for the construction of reference rays, and on three WA parameters specified in the Cartesian coordinate system related to the profile. In each layer, these three “profile” WA parameters depend on “local” WA parameters specifying anisotropy of a given layer in a local coordinate system and on directional cosines specifying the orientation of the local coordinate system with respect to the profile one. The number of local P-wave WA parameters may vary from three for transverse isotropy or six for orthorhombic symmetry to nine for triclinic symmetry. Our tests of the accuracy indicate that the maximum relative traveltime errors do not exceed 0.5% or 2.5% for weak or moderate P-wave anisotropy, respectively.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10507 - Volcanology

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

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

Name of the periodical

Geophysics

ISSN

0016-8033

e-ISSN

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Volume of the periodical

85

Issue of the periodical within the volume

2

Country of publishing house

US - UNITED STATES

Number of pages

10

Pages from-to

"C61"-"C70"

UT code for WoS article

000519538200029

EID of the result in the Scopus database

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