Electrical Resistivity Changes in Saturated Rock under Stress

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Science  23 Sep 1966:
Vol. 153, Issue 3743, pp. 1525-1526
DOI: 10.1126/science.153.3743.1525


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.