NDLI: Anisotropy of longitudinal and shear wave velocities in rocks under controlled pressure

Content Provider	IEEE Xplore Digital Library
Author	Karlqvist, R. Lassila, I. Haeggstrom, E. Pesonen, L.J.
Copyright Year	2013
Description	Author affiliation: Dept. of Phys., Univ. of Helsinki, Helsinki, Finland (Karlqvist, R.; Lassila, I.; Haeggstrom, E.; Pesonen, L.J.)
Abstract	Reliable interpretation of seismic surveys and borehole loggings requires that the seismic velocities and anisotropies of the bedrock are taken into account. There will be discrepancies in estimated reflector locations if one assumes isotropic velocity. Moreover, improved accuracy in determining reflector locations reduces drilling efforts in ore exploration. Our custom-built ultrasonic triaxial anvil setup permits measuring longitudinal (Vp) (1 MHz center frequency) and shear wave (Vs) (1.1 MHz center frequency with 0° and 90° polarization options) sound velocities in cubic rock samples (sides ~25 mm) under crustal-pressures up to 300 MPa in three directions (X, Y, and Z) simultaneously. Our results of eleven Precambrian rock samples from the FIRE-reflection profile in Central Finland show 3408-7250 m/s (Vs) and 2460-4140 m/s (Vp). The calculated velocity anisotropy values of these samples vary from 22% to 2% with applied pressure (up to 102 MPa).
Sponsorship	IEEE Ultrason., Ferroelectr., Freq. Control Society
Starting Page	1579
Ending Page	1582
File Size	494658
Page Count	4
File Format	PDF
ISSN	19485719
e-ISBN	9781467356862
DOI	10.1109/ULTSYM.2013.0402
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-07-21
Publisher Place	Czech Republic
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Anisotropic magnetoresistance Rocks Ultrasonic variables measurement Acoustics Reflection Velocity measurement Seismic measurements velocity anisotropy Ultrasonic rocks
Content Type	Text
Resource Type	Article

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