Aftershocks Caused by Pore Fluid Flow?

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Science  25 Feb 1972:
Vol. 175, Issue 4024, pp. 885-887
DOI: 10.1126/science.175.4024.885


Large shallow earthquakes can induce changes in the fluid pore pressure that are comparable to stress drops on faults. The subsequent redistribution of pore pressure as a result of fluid flow slowly decreases the strength of rock and may result in delayed fracture. The agreement between computed rates of decay and observed rates of aftershock activity suggests that this is an attractive mechanism for aftershockss.