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

SYSNO ASEP	0475899
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Effect of pressure on 3D distribution of P-wave velocity and attenuation in antigorite serpentinite
Author(s)	Svitek, Tomáš (GLU-S)_{SAI, RID} Vavryčuk, Václav (GFU-E)_{ORCID, RID} Lokajíček, Tomáš (GLU-S)_{RID, SAI, ORCID} Petružálek, Matěj (GLU-S)_{RID, SAI, ORCID} Kern, H. (DE)
Source Title	Geophysics. - : Society of Exploration Geophysicists - ISSN 0016-8033 Roč. 82, č. 4 (2017), WA33-WA43
Number of pages	11 s.
Publication form	Print - P
Language	eng - English
Country	US - United States
Keywords	antigorite ; serpentinite ; P-wawe velocity
Subject RIV	DB - Geology ; Mineralogy
OECD category	Geology
Subject RIV - cooperation	Geophysical Institute - Geology ; Mineralogy
R&D Projects	GA13-13967S GA ČR - Czech Science Foundation (CSF)
	GA16-03950S GA ČR - Czech Science Foundation (CSF)
	GC16-19751J GA ČR - Czech Science Foundation (CSF)
Institutional support	GLU-S - RVO:67985831 ; GFU-E - RVO:67985530
UT WOS	000408628900063
EID SCOPUS	85021686895
DOI	10.1190/GEO2017-0006.1
Annotation	We have developed 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 between the changes of velocity and attenuation anisotropy as pressure is increased. Although the velocity anisotropy is quite stable through all pressure levels, the attenuation anisotropy and the Q-factor vary significantly in magnitude and orientation. The variations are probably caused by the closing of microcracks due to acting hydrostatic pressure, so the contact conditions between individual minerals consolidate and the transmitting energy is less attenuating.
Workplace	Institute of Geology
Contact	Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272
Year of Publishing	2018

Number of the records: 1