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Statements

Subject Item
n2:RIV%2F67985831%3A_____%2F14%3A00429000%21RIV15-GA0-67985831
rdf:type
n5:Vysledek skos:Concept
dcterms:description
Ultrasonic measurements of the 3D velocity distribution of P- and S-waves were performed on a spherical sample of a biotite gneiss from the Outokumpu scientific drill hole. Measurements were done at room temperature and pressures up to 400 and 70. MPa, in a pressure vessel with oil as a pressure medium. A modified transducer/sample assembly and the installation of a new mechanical system allowed simultaneous measurements of P- and S-wave velocities in 132 independent directions of the sphere on a net in steps of 15°. Proper signals for P- and S-waves could be recorded by coating the sample surface with a high-viscosity shear wave gel. The 3D seismic measurements revealed a strong foliation-related directional dependence (anisotropy) of P- and S-wave velocities, which is confirmed by measurements in a multi-anvil apparatus on a cube-shaped specimen of the same rock. Both experimental approaches show a marked pressure sensitivity of P- and S-wave velocities and velocity anisotropies. With increasing pressure, P- and S-wave velocities increase non-linearly due to progressive closure of micro-cracks. 3D velocity calculations based on neutron diffraction measurements of crystallographic preferred orientation (CPO) of major minerals show that the intrinsic bulk anisotropy is basically caused by the CPO of biotite constituting about 23. vol.% of the rock. An important finding from this study is that the measurements on the sample sphere and on the sample cube displayed distinct differences, particularly in shear wave velocities. It is assumed that the differences are due to the different geometries of the samples and the configuration of the transducer-sample assembly. On the spherical sample with a point source and point receiver the first break at the velocity arrival time is suggested to define group velocities in most cases, whereas the receivers in the multi-anvil apparatus recorded the flat part of the wavefront, that is, phase velocities. Ultrasonic measurements of the 3D velocity distribution of P- and S-waves were performed on a spherical sample of a biotite gneiss from the Outokumpu scientific drill hole. Measurements were done at room temperature and pressures up to 400 and 70. MPa, in a pressure vessel with oil as a pressure medium. A modified transducer/sample assembly and the installation of a new mechanical system allowed simultaneous measurements of P- and S-wave velocities in 132 independent directions of the sphere on a net in steps of 15°. Proper signals for P- and S-waves could be recorded by coating the sample surface with a high-viscosity shear wave gel. The 3D seismic measurements revealed a strong foliation-related directional dependence (anisotropy) of P- and S-wave velocities, which is confirmed by measurements in a multi-anvil apparatus on a cube-shaped specimen of the same rock. Both experimental approaches show a marked pressure sensitivity of P- and S-wave velocities and velocity anisotropies. With increasing pressure, P- and S-wave velocities increase non-linearly due to progressive closure of micro-cracks. 3D velocity calculations based on neutron diffraction measurements of crystallographic preferred orientation (CPO) of major minerals show that the intrinsic bulk anisotropy is basically caused by the CPO of biotite constituting about 23. vol.% of the rock. An important finding from this study is that the measurements on the sample sphere and on the sample cube displayed distinct differences, particularly in shear wave velocities. It is assumed that the differences are due to the different geometries of the samples and the configuration of the transducer-sample assembly. On the spherical sample with a point source and point receiver the first break at the velocity arrival time is suggested to define group velocities in most cases, whereas the receivers in the multi-anvil apparatus recorded the flat part of the wavefront, that is, phase velocities.
dcterms:title
3D velocity distribution of P- and S-waves in a biotite gneiss, measured in oil as the pressure medium: Comparison with velocity measurements in a multi-anvil pressure apparatus and with texture-based calculated data 3D velocity distribution of P- and S-waves in a biotite gneiss, measured in oil as the pressure medium: Comparison with velocity measurements in a multi-anvil pressure apparatus and with texture-based calculated data
skos:prefLabel
3D velocity distribution of P- and S-waves in a biotite gneiss, measured in oil as the pressure medium: Comparison with velocity measurements in a multi-anvil pressure apparatus and with texture-based calculated data 3D velocity distribution of P- and S-waves in a biotite gneiss, measured in oil as the pressure medium: Comparison with velocity measurements in a multi-anvil pressure apparatus and with texture-based calculated data
skos:notation
RIV/67985831:_____/14:00429000!RIV15-GA0-67985831
n3:aktivita
n14:I n14:P
n3:aktivity
I, P(GA13-13967S), P(GAP104/12/0915), P(LH13102)
n3:cisloPeriodika
June
n3:dodaniDat
n9:2015
n3:domaciTvurceVysledku
n16:8814082 n16:8522189
n3:druhVysledku
n17:J
n3:duvernostUdaju
n11:S
n3:entitaPredkladatele
n6:predkladatel
n3:idSjednocenehoVysledku
58254
n3:idVysledku
RIV/67985831:_____/14:00429000
n3:jazykVysledku
n18:eng
n3:klicovaSlova
3D-velocity calculation; measured and calculated elastic properties; neutron diffraction; seismic anisotropy; velocity measurements
n3:klicoveSlovo
n4:seismic%20anisotropy n4:neutron%20diffraction n4:measured%20and%20calculated%20elastic%20properties n4:3D-velocity%20calculation n4:velocity%20measurements
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[E2D2266E9391]
n3:nazevZdroje
Physics of the Earth and Planetary Interiors
n3:obor
n10:DC
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
4
n3:projekt
n12:GAP104%2F12%2F0915 n12:LH13102 n12:GA13-13967S
n3:rokUplatneniVysledku
n9:2014
n3:svazekPeriodika
231
n3:tvurceVysledku
Lokajíček, Tomáš Svitek, Tomáš Kern, H. Ivankina, T.
n3:wos
000337660500001
s:issn
0031-9201
s:numberOfPages
15
n7:doi
10.1016/j.pepi.2014.04.002