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Science 25 February 1972:
Vol. 175. no. 4024, pp. 885 - 887
DOI: 10.1126/science.175.4024.885
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Articles

Aftershocks Caused by Pore Fluid Flow?

Amos Nur 1 and John R. Booker 2

1 Department of Geophysics, Stanford University, Stanford, California 94305
2 Geophysics Program, University of Washington, Seattle 98115

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.


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