Frequency Dependent Attenuation in Rocks

A comparison of laboratory Q values calculated from phase angles and hysteresis loop areas reveals an inconsistency. Q values calculated from hysteresis loops are a factor of 4 times greater than those from the phase angle. The source of this inconsistency is the definition of maximum strain energy...

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Bibliographic Details
Main Authors: Coyner, Karl B, Martin, Randolph J
Format: Report
Language:English
Subjects:
ANGLES
ANISOTROPY
ATTENUATION
FREQUENCY
FREQUENCY DEPENDENCE
Geology, Geochemistry and Mineralogy
GRANITE
HYSTERESIS
LABORATORY TESTS
LOOPS
PE62714E
PHASE
ROCK
SEISMIC WAVES
Seismology
STRESS STRAIN RELATIONS
WUAFGL7A10DADA
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Summary:A comparison of laboratory Q values calculated from phase angles and hysteresis loop areas reveals an inconsistency. Q values calculated from hysteresis loops are a factor of 4 times greater than those from the phase angle. The source of this inconsistency is the definition of maximum strain energy for a hysteresis loop. An accounting of this factor of 4 is significant in comparing various experimental results that have used either of the two techniques. Keywords: Seismic waves, Attenuation; Anisotropy; Rock properties; Stress strain relations; Granite; Laboratory tests.