Determination of rock-sample anisotropy from P- and S-wave traveltimes

0479672 - GFÚ 2018 CZ eng J - Článek v odborném periodiku
Pšenčík, Ivan - Růžek, Bohuslav - Lokajíček, Tomáš - Svitek, Tomáš
Determination of rock-sample anisotropy from P- and S-wave traveltimes.
Seismic waves in complex 3-D structures. Roč. 27 (2017), s. 15-35. ISSN 2336-3827
Grant CEP: GA ČR(CZ) GA16-05237S; GA ČR(CZ) GA16-03950S
Institucionální podpora: RVO:67985530 ; RVO:67985831
Klíčová slova: WA parameters
Obor OECD: Volcanology

Weak-anisotropy approximation is used to determine seismic anisotropy of rocks from laboratory measurements of P- and S-wave traveltimes. In the weak-anisotropy approximation, one can invert P-wave traveltimes alone. In such a case, one obtains 15 P-wave weak-anisotropy (WA) parameters, which allow an approximate reconstruction of the P-wave phase-velocity surface. In order to obtain all 21 WA parameters, S-wave traveltimes must also be included in the inversion process. We test both types of inversion, with P-wave data only and with both P- and S-wave data, first on synthetic, then on laboratory data. The proposed inversion procedure is non-iterative, it does not require analysis of the type (phase or ray) of the velocity used. It requires knowledge of S-wave traveltimes only without their association with the polarization.
Trvalý link: http://hdl.handle.net/11104/0275641