Variability of dynamic source parameters inferred from kinematic models of past earthquakes

Handle URI:
http://hdl.handle.net/10754/554379
Title:
Variability of dynamic source parameters inferred from kinematic models of past earthquakes
Authors:
Causse, M.; Dalguer, L. A.; Mai, Paul Martin ( 0000-0002-9744-4964 )
Abstract:
We analyse the scaling and distribution of average dynamic source properties (fracture energy, static, dynamic and apparent stress drops) using 31 kinematic inversion models from 21 crustal earthquakes. Shear-stress histories are computed by solving the elastodynamic equations while imposing the slip velocity of a kinematic source model as a boundary condition on the fault plane. This is achieved using a 3-D finite difference method in which the rupture kinematics are modelled with the staggered-grid-split-node fault representation method of Dalguer & Day. Dynamic parameters are then estimated from the calculated stress-slip curves and averaged over the fault plane. Our results indicate that fracture energy, static, dynamic and apparent stress drops tend to increase with magnitude. The epistemic uncertainty due to uncertainties in kinematic inversions remains small (ϕ ∼ 0.1 in log10 units), showing that kinematic source models provide robust information to analyse the distribution of average dynamic source parameters. The proposed scaling relations may be useful to constrain friction law parameters in spontaneous dynamic rupture calculations for earthquake source studies, and physics-based near-source ground-motion prediction for seismic hazard and risk mitigation.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Variability of dynamic source parameters inferred from kinematic models of past earthquakes 2013, 196 (3):1754 Geophysical Journal International
Publisher:
Oxford University Press (OUP)
Journal:
Geophysical Journal International
Issue Date:
24-Dec-2013
DOI:
10.1093/gji/ggt478
Type:
Article
ISSN:
0956-540X; 1365-246X
Additional Links:
http://gji.oxfordjournals.org/cgi/doi/10.1093/gji/ggt478
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorCausse, M.en
dc.contributor.authorDalguer, L. A.en
dc.contributor.authorMai, Paul Martinen
dc.date.accessioned2015-05-21T06:35:33Zen
dc.date.available2015-05-21T06:35:33Zen
dc.date.issued2013-12-24en
dc.identifier.citationVariability of dynamic source parameters inferred from kinematic models of past earthquakes 2013, 196 (3):1754 Geophysical Journal Internationalen
dc.identifier.issn0956-540Xen
dc.identifier.issn1365-246Xen
dc.identifier.doi10.1093/gji/ggt478en
dc.identifier.urihttp://hdl.handle.net/10754/554379en
dc.description.abstractWe analyse the scaling and distribution of average dynamic source properties (fracture energy, static, dynamic and apparent stress drops) using 31 kinematic inversion models from 21 crustal earthquakes. Shear-stress histories are computed by solving the elastodynamic equations while imposing the slip velocity of a kinematic source model as a boundary condition on the fault plane. This is achieved using a 3-D finite difference method in which the rupture kinematics are modelled with the staggered-grid-split-node fault representation method of Dalguer & Day. Dynamic parameters are then estimated from the calculated stress-slip curves and averaged over the fault plane. Our results indicate that fracture energy, static, dynamic and apparent stress drops tend to increase with magnitude. The epistemic uncertainty due to uncertainties in kinematic inversions remains small (ϕ ∼ 0.1 in log10 units), showing that kinematic source models provide robust information to analyse the distribution of average dynamic source parameters. The proposed scaling relations may be useful to constrain friction law parameters in spontaneous dynamic rupture calculations for earthquake source studies, and physics-based near-source ground-motion prediction for seismic hazard and risk mitigation.en
dc.publisherOxford University Press (OUP)en
dc.relation.urlhttp://gji.oxfordjournals.org/cgi/doi/10.1093/gji/ggt478en
dc.rightsArchived with thanks to Geophysical Journal International © The Authors 2013. Published by Oxford University Press on behalf of The Royal Astronomical Society.en
dc.subjectEarthquake ground motionsen
dc.subjectEarthquake source observationsen
dc.subjectComputational seismologyen
dc.titleVariability of dynamic source parameters inferred from kinematic models of past earthquakesen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalGeophysical Journal Internationalen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionISTerre, Université Joseph Fourier, IFSTTAR, F-38041 Grenoble, Franceen
dc.contributor.institutionSwiss Seismological Service, ETH Zürich, CH-8092 Zürich, Switzerlanden
kaust.authorMai, Paul Martinen
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