3D distribution of P-wave velocity and attenuation in antigorite serpentinite

0481259 - GLÚ 2018 US eng C - Konferenční příspěvek (zahraniční konf.)
Svitek, Tomáš - Lokajíček, Tomáš - Petružálek, Matěj - Vavryčuk, Václav
3D distribution of P-wave velocity and attenuation in antigorite serpentinite.
51st US Rock Mechanics/Geomechanics Symposium. s. l.: American Rock Mechanics Association, 2017, č. článku 17-829. ISBN N.
[US Rock Mechanics/Geomechanics Symposium /51./. San Francisco (US), 25.06.2017-28.06.2017]
Grant CEP: GA ČR GA13-13967S; GA ČR(CZ) GA16-03950S
Institucionální podpora: RVO:67985831 ; RVO:67985530
Klíčová slova: serpentinite * P-wawe velocity * anisotropy
Kód oboru RIV: DB - Geologie a mineralogie

Seismic velocity and attenuation anisotropy is an important property of many crustal and mantle rocks. The velocity anisotropy characterizes a directionally dependent propagation velocity of seismic waves, whereas attenuation anisotropy controls directionally dependent dissipation of seismic energy. We present a detailed study on the pressure dependence of P-wave velocities and amplitudes on a spherical sample of antigorite serpentinite from Val Malenco, Northern Italy. Measurements were done at room temperature and hydrostatic pressures up to 400 MPa in a pressure vessel with oil as a pressure medium. The transducer/sample assembly allows simultaneous velocity and amplitude measurements on the spherical sample in 132 independent directions. Three significant directions of the foliated sample were selected to study changes of the directional dependence (anisotropy) of velocity, amplitude and Q-factor with increasing pressure. Remarkable differences are observed in the changes of velocity and attenuation anisotropy as pressure is increased.
Trvalý link: http://hdl.handle.net/11104/0276857