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P-wave reflection-moveout approximation for horizontally layered media of arbitrary moderate anisotropy
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SYSNO ASEP 0523729 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název P-wave reflection-moveout approximation for horizontally layered media of arbitrary moderate anisotropy Tvůrce(i) Farra, V. (FR)
Pšenčík, Ivan (GFU-E) ORCID, RIDZdroj.dok. Geophysics. - : Society of Exploration Geophysicists - ISSN 0016-8033
Roč. 85, č. 2 (2020), C61-C70Poč.str. 10 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova P-wave moveout ; arbitrary anisotropy ; layered structures Vědní obor RIV DC - Seismologie, vulkanologie a struktura Země Obor OECD Volcanology Způsob publikování Omezený přístup Institucionální podpora GFU-E - RVO:67985530 UT WOS 000519538200029 DOI 10.1190/GEO2019-0232.1 Anotace 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. Pracoviště Geofyzikální ústav Kontakt Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028 Rok sběru 2021 Elektronická adresa https://library.seg.org/doi/full/10.1190/geo2019-0232.1
Počet záznamů: 1