Creep, compaction and the weak rheology of major faults
Nature
By: Norman H. Sleep and M.L. Blanpied
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Abstract
Field and laboratory observations suggest that the porosity within fault zones varies over earthquake cycles so that fluid pressure is in long-term equilibrium with hydrostatic fluid pressure in the country rock. Between earthquakes, ductile creep compacts the fault zone, increasing fluid pressure, and finally allowing frictional failure at relatively low shear stress. Earthquake faulting restores porosity and decreases fluid pressure to below hydrostatic. This mechanism may explain why major faults, such as the San Andreas system, are weak.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Creep, compaction and the weak rheology of major faults |
| Series title | Nature |
| DOI | 10.1038/359687a0 |
| Volume | 359 |
| Issue | 6397 |
| Year Published | 1992 |
| Language | English |
| Publisher | Springer Nature |
| Description | 6 p. |
| First page | 687 |
| Last page | 692 |