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Resonant Ultrasound Spectroscopy: theory and application.
- Source :
-
Geophysical Journal International . Jan2004, Vol. 156 Issue 1, p154-169. 16p. - Publication Year :
- 2004
-
Abstract
- Resonant Ultrasound Spectroscopy (RUS) uses normal modes of elastic bodies to infer material properties such as elastic moduli and Q. In principle, the complete elastic tensor can be inferred from a single measurement. For centimeter-sized samples RUS fills an experimental gap between low-frequency stress-strain methods (quasi-static up to a few kHz) and ultrasonic time-delay methods (hundreds of kHz to GHz). We use synchronous detection methods to measure the resonance spectra of homogeneous rock samples. These spectra are then fit interactively with a model to extract the normal-mode frequencies and Q factors. Inversion is performed by fitting the normal-mode frequencies. We have successfully applied this technique to a variety of isotropic and anisotropic samples, both man-made and natural. In this paper we will show in detail the procedure applied to a cylindrical core of Elberton granite. By means of a statistical fit of the measured normal modes and an independent laser ultrasonic measurement, the granite core was inferred to have orthorhombic symmetry. A 10 per cent P-wave anisotropy was measured in the plane perpendicular to the core axis. [ABSTRACT FROM AUTHOR]
- Subjects :
- *GRANITE
*ANISOTROPY
*ROCKS
Subjects
Details
- Language :
- English
- ISSN :
- 0956540X
- Volume :
- 156
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Geophysical Journal International
- Publication Type :
- Academic Journal
- Accession number :
- 11691759
- Full Text :
- https://doi.org/10.1111/j.1365-246X.2004.02093.x