Constraining the roughness degree of slip heterogeneity

Handle URI:
http://hdl.handle.net/10754/552179
Title:
Constraining the roughness degree of slip heterogeneity
Authors:
Causse, Mathieu; Cotton, Fabrice; Mai, Paul Martin ( 0000-0002-9744-4964 )
Abstract:
This article investigates different approaches for assessing the degree of roughness of the slip distribution of future earthquakes. First, we analyze a database of slip images extracted from a suite of 152 finite-source rupture models from 80 events (Mw = 4.1–8.9). This results in an empirical model defining the distribution of the slip spectrum corner wave numbers (kc) as a function of moment magnitude. To reduce the “epistemic” uncertainty, we select a single slip model per event and screen out poorly resolved models. The number of remaining models (30) is thus rather small. In addition, the robustness of the empirical model rests on a reliable estimation of kc by kinematic inversion methods. We address this issue by performing tests on synthetic data with a frequency domain inversion method. These tests reveal that due to smoothing constraints used to stabilize the inversion process, kc tends to be underestimated. We then develop an alternative approach: (1) we establish a proportionality relationship between kc and the peak ground acceleration (PGA), using a k−2 kinematic source model, and (2) we analyze the PGA distribution, which is believed to be better constrained than slip images. These two methods reveal that kc follows a lognormal distribution, with similar standard deviations for both methods.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Constraining the roughness degree of slip heterogeneity 2010, 115 (B5) Journal of Geophysical Research
Publisher:
Wiley-Blackwell
Journal:
Journal of Geophysical Research
Issue Date:
7-May-2010
DOI:
10.1029/2009JB006747
Type:
Article
ISSN:
0148-0227
Additional Links:
http://doi.wiley.com/10.1029/2009JB006747
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorCausse, Mathieuen
dc.contributor.authorCotton, Fabriceen
dc.contributor.authorMai, Paul Martinen
dc.date.accessioned2015-05-04T16:36:56Zen
dc.date.available2015-05-04T16:36:56Zen
dc.date.issued2010-05-07en
dc.identifier.citationConstraining the roughness degree of slip heterogeneity 2010, 115 (B5) Journal of Geophysical Researchen
dc.identifier.issn0148-0227en
dc.identifier.doi10.1029/2009JB006747en
dc.identifier.urihttp://hdl.handle.net/10754/552179en
dc.description.abstractThis article investigates different approaches for assessing the degree of roughness of the slip distribution of future earthquakes. First, we analyze a database of slip images extracted from a suite of 152 finite-source rupture models from 80 events (Mw = 4.1–8.9). This results in an empirical model defining the distribution of the slip spectrum corner wave numbers (kc) as a function of moment magnitude. To reduce the “epistemic” uncertainty, we select a single slip model per event and screen out poorly resolved models. The number of remaining models (30) is thus rather small. In addition, the robustness of the empirical model rests on a reliable estimation of kc by kinematic inversion methods. We address this issue by performing tests on synthetic data with a frequency domain inversion method. These tests reveal that due to smoothing constraints used to stabilize the inversion process, kc tends to be underestimated. We then develop an alternative approach: (1) we establish a proportionality relationship between kc and the peak ground acceleration (PGA), using a k−2 kinematic source model, and (2) we analyze the PGA distribution, which is believed to be better constrained than slip images. These two methods reveal that kc follows a lognormal distribution, with similar standard deviations for both methods.en
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://doi.wiley.com/10.1029/2009JB006747en
dc.rightsArchived with thanks to Journal of Geophysical Researchen
dc.titleConstraining the roughness degree of slip heterogeneityen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalJournal of Geophysical Researchen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionLaboratoire de Géophysique Interne et Tectonophysique, CNRS, Institut de Recherche pour le Développement, Université Joseph Fourier, Grenoble, Franceen
kaust.authorMai, Paul Martinen
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