Complexity in earthquake sequences controlled by multi-scale heterogeneity in fault fracture energy - BRGM - Bureau de recherches géologiques et minières Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research : Solid Earth Année : 2009

Complexity in earthquake sequences controlled by multi-scale heterogeneity in fault fracture energy

Résumé

A series of dynamic rupture events under constant tectonic loading is simulated on a fault with multi-scale heterogeneity and a stochastic rupture initiation process. The fracture energy of the fault plane is assumed to have multi-scale heterogeneous distribution using fractal circular patches. The stochastic rupture initiation process as a function of the accumulated stress is introduced in order to take account of unknown smaller-scale heterogeneity and variability. Five realizations of a statistical spatial distribution of fracture energy (fault heterogeneity maps) are tested for the simulations of earthquake sequences during a few seismic cycles. The diversity of earthquake sequences is principally controlled by the spatial distribution of the patches. The effect of dynamic rupture appears in the residual stress after the characteristic events due to their directivity and this localizes the subsequent sequences. Although the characteristic earthquakes occur rather regularly in time and similarly in different seismic cycles, some irregular behavior is found, based on the heterogeneity maps and the randomness of the preceding earthquake sequence, leading to a visible anomaly in the seismicity. Such anomalies are not predicable, but understandable through the analysis of the considered earthquakes during the cycle. The similarity and the diversity simulated in this study, governed by the structure of an inherent distribution of multi-scale heterogeneity, suggests the importance of the pre-existing heterogeneity field along the fault for the appearance of earthquake sequences, including those that are characteristic
Fichier principal
Vignette du fichier
paper21R2-v17.pdf (4.45 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-00502710 , version 1 (15-07-2010)

Identifiants

Citer

Hideo Aochi, Satoshi Ide. Complexity in earthquake sequences controlled by multi-scale heterogeneity in fault fracture energy. Journal of Geophysical Research : Solid Earth, 2009, 114 (B03305), 13 p. ⟨10.1029/2008JB006034⟩. ⟨hal-00502710⟩

Collections

BRGM
88 Consultations
253 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More