Pressure dependence of Q in selected rocks.

K. W. Katahara, M. H. Manghnani, N. Devnani, Bernhard R. Tittmann

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The dissipation factor (Q-1) for torsional vibration has been measured for several low-porosity crystalline rocks up to 0.5GPa confining pressure. Q was measured at frequencies of approx 10kHz by a resonant bar technique in which cylindrical samples are enclosed in a thin-walled copper sheath welded to copper end plugs, with piezoelectric transducers bonded to the ends. Some of the samples were encapsulated under laboratory conditions (30-40% humidity) whereas others were encapsulated in vacuum (approx 10-5torr). Q was found to increase by 103 or more between 0 and 0.5GPa for most of the samples. In some cases, values well over 2000 were found at 0.5GPa. For some of the rocks, including vacuum-dry as well as air-dry samples, Q was found to continue increasing pressure even after most of the cracks were closed. A significant time dependence was also observed. After any increase or decrease in confining pressure, Q was observed to increase slowly for several days at least. Possible attenuation mechanisms and implications for the earth's interior are discussed.-Authors

Original languageEnglish (US)
Pages (from-to)147-158
Number of pages12
JournalUnknown Journal
StatePublished - Jan 1 1982

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confining pressure
copper
Q factor
crystalline rock
transducer
rock
dissipation
vibration
humidity
crack
porosity
air
laboratory

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

Katahara, K. W., Manghnani, M. H., Devnani, N., & Tittmann, B. R. (1982). Pressure dependence of Q in selected rocks. Unknown Journal, 147-158.
Katahara, K. W. ; Manghnani, M. H. ; Devnani, N. ; Tittmann, Bernhard R. / Pressure dependence of Q in selected rocks. In: Unknown Journal. 1982 ; pp. 147-158.
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Katahara, KW, Manghnani, MH, Devnani, N & Tittmann, BR 1982, 'Pressure dependence of Q in selected rocks.', Unknown Journal, pp. 147-158.

Pressure dependence of Q in selected rocks. / Katahara, K. W.; Manghnani, M. H.; Devnani, N.; Tittmann, Bernhard R.

In: Unknown Journal, 01.01.1982, p. 147-158.

Research output: Contribution to journalArticle

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AU - Tittmann, Bernhard R.

PY - 1982/1/1

Y1 - 1982/1/1

N2 - The dissipation factor (Q-1) for torsional vibration has been measured for several low-porosity crystalline rocks up to 0.5GPa confining pressure. Q was measured at frequencies of approx 10kHz by a resonant bar technique in which cylindrical samples are enclosed in a thin-walled copper sheath welded to copper end plugs, with piezoelectric transducers bonded to the ends. Some of the samples were encapsulated under laboratory conditions (30-40% humidity) whereas others were encapsulated in vacuum (approx 10-5torr). Q was found to increase by 103 or more between 0 and 0.5GPa for most of the samples. In some cases, values well over 2000 were found at 0.5GPa. For some of the rocks, including vacuum-dry as well as air-dry samples, Q was found to continue increasing pressure even after most of the cracks were closed. A significant time dependence was also observed. After any increase or decrease in confining pressure, Q was observed to increase slowly for several days at least. Possible attenuation mechanisms and implications for the earth's interior are discussed.-Authors

AB - The dissipation factor (Q-1) for torsional vibration has been measured for several low-porosity crystalline rocks up to 0.5GPa confining pressure. Q was measured at frequencies of approx 10kHz by a resonant bar technique in which cylindrical samples are enclosed in a thin-walled copper sheath welded to copper end plugs, with piezoelectric transducers bonded to the ends. Some of the samples were encapsulated under laboratory conditions (30-40% humidity) whereas others were encapsulated in vacuum (approx 10-5torr). Q was found to increase by 103 or more between 0 and 0.5GPa for most of the samples. In some cases, values well over 2000 were found at 0.5GPa. For some of the rocks, including vacuum-dry as well as air-dry samples, Q was found to continue increasing pressure even after most of the cracks were closed. A significant time dependence was also observed. After any increase or decrease in confining pressure, Q was observed to increase slowly for several days at least. Possible attenuation mechanisms and implications for the earth's interior are discussed.-Authors

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Katahara KW, Manghnani MH, Devnani N, Tittmann BR. Pressure dependence of Q in selected rocks. Unknown Journal. 1982 Jan 1;147-158.