Fractal Spatial Distributions of Initial Shear Stress and Frictional Properties on Faults and Their Impact on Dynamic Earthquake Rupture

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dc.contributor.authorVenegas-Aravena, Patricio
dc.contributor.authorCrempien, Jorge G. F.
dc.contributor.authorArchuleta, Ralph J.
dc.date.accessioned2025-01-20T16:14:06Z
dc.date.available2025-01-20T16:14:06Z
dc.date.issued2024
dc.description.abstractWe investigate the influence of the heterogeneous slip-weakening distance ( D-C ) in dynamic rupture simulations, in which D-C is proportional to the fault irregularities. Specifically, we compare a heterogeneous fractal D-C distribution to a uniform D-C over the entire fault when the initial shear stress is also heterogeneous. We find that even small changes in the average value of D-C ( < 1 mm) can lead to significant differences in the rupture evolution; that is, the average D-C and the way D(C )is distributed determines if the rupture is a runaway, self-arrested, or nonpropagating. We find that the self-arrested ruptures differ from runaway ruptures in the amount of area characterized by large slips (asperities). Self-arrested ruptures match the Somerville et al. (1999) asperity criteria in which - 25% of ruptured area radiate - 45% of the total seismic moment. This criterion is not satisfied for runaway ruptures. For runaway ruptures, - 50% of the ruptured area radiates about 70% of the seismic moment, indicating that the ruptured area is not linearly proportional to the seismic moment. Self-arrested ruptures are characterized by dynamic shear stress drops (SDs) in the range - 2.9 -5.5 MPa, whereas for runaway ruptures the dynamic SDs increase to values between -12 and 20 MPa. Self-arrested ruptures generated by fractal distributed D-C resemble the rupture properties of observed earthquakes. In addition, results show that the conditions for self-arrested ruptures are connected to the decrease of residual energy at rupture boundaries.
dc.fuente.origenWOS
dc.identifier.doi10.1785/0120230123
dc.identifier.eissn1943-3573
dc.identifier.issn0037-1106
dc.identifier.urihttps://doi.org/10.1785/0120230123
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90422
dc.identifier.wosidWOS:001260897600001
dc.issue.numero3
dc.language.isoen
dc.pagina.final1465
dc.pagina.inicio1444
dc.revistaBulletin of the seismological society of america
dc.rightsacceso restringido
dc.subject.ods11 Sustainable Cities and Communities
dc.subject.odspa11 Ciudades y comunidades sostenibles
dc.titleFractal Spatial Distributions of Initial Shear Stress and Frictional Properties on Faults and Their Impact on Dynamic Earthquake Rupture
dc.typeartículo
dc.volumen114
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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