Name
Abstract | ||
|---|---|---|
Seeing the Earth crust as criss-crossed by faults filled with fluid at close to lithostatic pressures, we develop a model in which its elastic modulii are different in net tension versus compression. In constrast with standard nonlinear effects, this "threshold nonlinearity" is non-perturbative and occurs for infinitesimal perturbations around the lithostatic pressure taken as the reference. For a given earthquake source, such nonlinear elasticity is shown to (i) rotate, widen or narrow the different lobes of stress transfer, (ii) to modify the 1/r2 2D-decay of elastic stress Green functions into the generalized power law 1/rγ, where γ depends on the azimuth and on the amplitude of the modulii asymmetry. Using reasonable estimates, this implies an enhancement of the range of interaction between earthquakes by a factor up to 5-10, that is, stress perturbation of 0.1 bar or more are found up to distances of several tens of the rupture length. This may explain certain long-range earthquake triggering and hydrological anomalies in wells and suggest to revisit the standard stress transfer calculations which use linear elasticity. We also show that the standard double-couple of forces representing an earthquake source leads to an opening of the corresponding fault plane, which suggests a mechanism for the non-zero isotropic component of the seismic moment tensor observed for some events. |
Year | DOI | Venue |
|---|---|---|
2006 | 10.1016/j.future.2005.04.007 | Future Generation Comp. Syst. |
Keywords | Field | DocType |
standard nonlinear effect,different lobe,nonlinear elastic crust,certain long-range earthquake,standard double-couple,elastic stress green function,long-range static directional stress,stress perturbation,earthquake source,stress transfer,elastic modulii,standard stress transfer calculation,linear elasticity,green function,power law,non perturbative | Compression (physics),Isotropy,Tensor,Overburden pressure,Computer science,Real-time computing,Mechanics,Linear elasticity,Elasticity (economics),Seismic moment,Power law | Journal |
Volume | Issue | ISSN |
22 | 4 | Future Generation Computer Systems |
Citations | PageRank | References |
0 | 0.34 | 0 |
Authors | ||
2 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| G. Ouillon | 1 | 0 | 0.34 |
| Didier Sornette | 2 | 238 | 37.50 |