Changes in absorption of ultrasonic energy travelling through rock specimens stressed to fracture

Details Changes in absorption of ultrasonic energy travelling through rock specimens stressed to fracture Changes in absorption of ultrasonic energy travelling through rock specimens stressed to fracture

Dec 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970pepi....4...43g&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 4, Issue 1, p. 43-48.

Physics

Scientific paper

The variation in amplitude of ultrasonic energy travelling through uniaxially compressed specimens of some crystalline rocks was studied. The amplitude of energy generally increased up to about half the fracture stress and then started decreasing, especially beyond 3/4 of the fracture stress, resulting in the total disappearence of the pulse at the instant of total failure. In some cases, the amplitude remained constant before it started decreasing at high stress level. Similar changes in the amplitude were observed even in the case of confined microfracturization tests. The sharp decrease in amplitude in the high stress region has been found to correspond closely to the accumulated energy of seismo-acoustic emissions. The anomalous behaviour exhibited by schist rock specimens has been explained in terms of a hypothesis, postulated here, about the mechanism of rock-faulting in homogeneous rock specimens. Experimental results reported in this paper suggest that the studies on the amplitude changes, in time, of seismic energy travelling in between prefixed points in a tectonically active region may prove to be useful in finding out stress build-up or stress-drop prior to an earthquake.

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