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Science 23 September 1966:
Vol. 153. no. 3743, pp. 1525 - 1526
DOI: 10.1126/science.153.3743.1525
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Articles

Electrical Resistivity Changes in Saturated Rock under Stress

W. F. Brace 1 and A. S. Orange 1

1 Department of Geology and Geophysics, Massachusetts Institute of Technology, Cambridge

Electrical resistivity of water-saturated crystalline rock such as granite, diabase, dunite, or quartzite changes by an order of magnitude prior to fracture of the rock in compression. The effect observed even under high confining pressure is due to formation of open cracks which first appear at one-third to two-thirds the fracture stress.


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