Skip to Main content Skip to Navigation
Journal articles

Fault Heterogeneity and the Connection between Aftershocks and Afterslip

Abstract : Whether aftershocks originate directly from the mainshock and surrounding stress environment or from afterslip dynamics is crucial to the understanding of the nature of aftershocks. We build on a classical description of the fault and creeping regions as two blocks connected elastically, subject to different friction laws. We show analytically that, upon introduction of variability in the fault plane’s static friction threshold, a non trivial stick-slip dynamics ensues. In particular we support the hypothesis that the aftershock occurrence rate is proportional to the afterslip rate, up to a corrective factor that is also computed. Thus, the Omori law originates from the afterslip’s logarithmic evolution in the velocity-strengthening region. We confirm these analytical results with numerical simulations, generating synthetic catalogs with statistical features in good agreement with instrumental catalogs. In particular we recover the Gutenberg-Richter law with a realistic b-value (b'1) when Coulomb stress thresholds obey a power law distribution.
Complete list of metadatas

Cited literature [34 references]  Display  Hide  Download
Contributor : François Landes <>
Submitted on : Thursday, September 17, 2020 - 5:29:48 PM
Last modification on : Wednesday, October 14, 2020 - 3:47:36 AM
Long-term archiving on: : Saturday, December 5, 2020 - 1:13:11 AM


Files produced by the author(s)




Eugenio Lippiello, Giuseppe Petrillo, François Landes, Alberto Rosso. Fault Heterogeneity and the Connection between Aftershocks and Afterslip. Bulletin of the Seismological Society of America, Seismological Society of America, 2019, 109 (3), pp.1156-1163. ⟨10.1785/0120180244⟩. ⟨hal-02156407⟩



Record views


Files downloads