Paradox of peroxy defects and positive holes in rocks Part II: Outflow of electric currents from stressed rocks
- Scoville, John
- Sornette, Jaufray
- Freund, Friedemann T.
DOIAbstract
AbstractUnderstanding the electrical properties of rocks is of fundamental interest. We report on currents generated when stresses are applied. Loading the center of gabbro tiles, 30×30×0.9cm3, across a 5cm diameter piston, leads to positive currents flowing from the center to the unstressed edges. Changing the constant rate of loading over 5 orders of magnitude from 0.2kPa/s to 20MPa/s produces positive currents, which start to flow already at low stress levels, <5MPa. The currents increase as long as stresses increase. At constant load they flow for hours, days, even weeks and months, slowly decreasing with time. When stresses are removed, they rapidly disappear but can be made to reappear upon reloading. These currents are consistent wit...
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