A statistical model for the seismicity rate of fluid-injection-induced earthquakes
Article first published online: 15 SEP 2004
Copyright 2004 by the American Geophysical Union.
Geophysical Research Letters
Volume 31, Issue 17, September 2004
How to Cite
2004), A statistical model for the seismicity rate of fluid-injection-induced earthquakes, Geophys. Res. Lett., 31, L17609, doi:10.1029/2004GL020421., and (
- Issue published online: 15 SEP 2004
- Article first published online: 15 SEP 2004
- Manuscript Accepted: 17 AUG 2004
- Manuscript Revised: 30 JUL 2004
- Manuscript Received: 3 MAY 2004
 We present a model for explaining the seismicity rate of fluid-injection-induced earthquakes. It is assumed that pore-pressure diffusion is the main triggering mechanism, and that the criticality of the medium is randomly distributed. Based on these and other poroelastic and stochastic assumptions, we derive equations for the induced seismicity rate during and after fluid injection. On this basis, a method is proposed for estimating hydraulic diffusivity using only the observed seismicity rate and an estimate of the activated seismogenic volume. This approach differs from previous methods in that an accurate hypocentral parameter catalog is not required. Numerical investigation of the proposed method indicates that it is relatively robust with respect to the activated seismogenic volume dimension estimate. Application of the technique to two Hot Dry Rock experiments, Fenton Hill and Soultz, produces diffusivity values that are consistent with independent estimates from prior investigations.