Pseudodynamic Source Characterization for Strike-Slip Faulting Including Stress Heterogeneity and Super-Shear Ruptures

Handle URI:
http://hdl.handle.net/10754/555764
Title:
Pseudodynamic Source Characterization for Strike-Slip Faulting Including Stress Heterogeneity and Super-Shear Ruptures
Authors:
Mena, B.; Dalguer, L. A.; Mai, Paul Martin ( 0000-0002-9744-4964 )
Abstract:
Reliable ground‐motion prediction for future earthquakes depends on the ability to simulate realistic earthquake source models. Though dynamic rupture calculations have recently become more popular, they are still computationally demanding. An alternative is to invoke the framework of pseudodynamic (PD) source characterizations that use simple relationships between kinematic and dynamic source parameters to build physically self‐consistent kinematic models. Based on the PD approach of Guatteri et al. (2004), we propose new relationships for PD models for moderate‐to‐large strike‐slip earthquakes that include local supershear rupture speed due to stress heterogeneities. We conduct dynamic rupture simulations using stochastic initial stress distributions to generate a suite of source models in the magnitude Mw 6–8. This set of models shows that local supershear rupture speed prevails for all earthquake sizes, and that the local rise‐time distribution is not controlled by the overall fault geometry, but rather by local stress changes on the faults. Based on these findings, we derive a new set of relations for the proposed PD source characterization that accounts for earthquake size, buried and surface ruptures, and includes local rise‐time variations and supershear rupture speed. By applying the proposed PD source characterization to several well‐recorded past earthquakes, we verify that significant improvements in fitting synthetic ground motion to observed ones is achieved when comparing our new approach with the model of Guatteri et al. (2004). The proposed PD methodology can be implemented into ground‐motion simulation tools for more physically reliable prediction of shaking in future earthquakes.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Pseudodynamic Source Characterization for Strike-Slip Faulting Including Stress Heterogeneity and Super-Shear Ruptures 2012, 102 (4):1654 Bulletin of the Seismological Society of America
Journal:
Bulletin of the Seismological Society of America
Issue Date:
8-Aug-2012
DOI:
10.1785/0120110111
Type:
Article
ISSN:
0037-1106
Additional Links:
http://www.bssaonline.org/cgi/doi/10.1785/0120110111
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorMena, B.en
dc.contributor.authorDalguer, L. A.en
dc.contributor.authorMai, Paul Martinen
dc.date.accessioned2015-05-26T07:08:17Zen
dc.date.available2015-05-26T07:08:17Zen
dc.date.issued2012-08-08en
dc.identifier.citationPseudodynamic Source Characterization for Strike-Slip Faulting Including Stress Heterogeneity and Super-Shear Ruptures 2012, 102 (4):1654 Bulletin of the Seismological Society of Americaen
dc.identifier.issn0037-1106en
dc.identifier.doi10.1785/0120110111en
dc.identifier.urihttp://hdl.handle.net/10754/555764en
dc.description.abstractReliable ground‐motion prediction for future earthquakes depends on the ability to simulate realistic earthquake source models. Though dynamic rupture calculations have recently become more popular, they are still computationally demanding. An alternative is to invoke the framework of pseudodynamic (PD) source characterizations that use simple relationships between kinematic and dynamic source parameters to build physically self‐consistent kinematic models. Based on the PD approach of Guatteri et al. (2004), we propose new relationships for PD models for moderate‐to‐large strike‐slip earthquakes that include local supershear rupture speed due to stress heterogeneities. We conduct dynamic rupture simulations using stochastic initial stress distributions to generate a suite of source models in the magnitude Mw 6–8. This set of models shows that local supershear rupture speed prevails for all earthquake sizes, and that the local rise‐time distribution is not controlled by the overall fault geometry, but rather by local stress changes on the faults. Based on these findings, we derive a new set of relations for the proposed PD source characterization that accounts for earthquake size, buried and surface ruptures, and includes local rise‐time variations and supershear rupture speed. By applying the proposed PD source characterization to several well‐recorded past earthquakes, we verify that significant improvements in fitting synthetic ground motion to observed ones is achieved when comparing our new approach with the model of Guatteri et al. (2004). The proposed PD methodology can be implemented into ground‐motion simulation tools for more physically reliable prediction of shaking in future earthquakes.en
dc.relation.urlhttp://www.bssaonline.org/cgi/doi/10.1785/0120110111en
dc.rightsArchived with thanks to Bulletin of the Seismological Society of America © 2015 by the Seismological Society of Americaen
dc.titlePseudodynamic Source Characterization for Strike-Slip Faulting Including Stress Heterogeneity and Super-Shear Rupturesen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalBulletin of the Seismological Society of Americaen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionSwiss Seismological Service, ETH Zurich, Sonneggstrasse 5, CH‐8092 Zurich Switzerlanden
kaust.authorMai, Paul Martinen
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