Modeling the seismic cycle in subduction zones: The role and spatiotemporal occurrence of off-megathrust earthquakes

Handle URI:
http://hdl.handle.net/10754/552100
Title:
Modeling the seismic cycle in subduction zones: The role and spatiotemporal occurrence of off-megathrust earthquakes
Authors:
van Dinther, Y.; Mai, Paul Martin ( 0000-0002-9744-4964 ) ; Dalguer, L. A.; Gerya, T. V.
Abstract:
Shallow off-megathrust subduction events are important in terms of hazard assessment and coseismic energy budget. Their role and spatiotemporal occurrence, however, remain poorly understood. We simulate their spontaneous activation and propagation using a newly developed 2-D, physically consistent, continuum, viscoelastoplastic seismo-thermo-mechanical modeling approach. The characteristics of simulated normal events within the outer rise and splay and normal antithetic events within the wedge resemble seismic and seismological observations in terms of location, geometry, and timing. Their occurrence agrees reasonably well with both long-term analytical predictions based on dynamic Coulomb wedge theory and short-term quasi-static stress changes resulting from the typically triggering megathrust event. The impact of off-megathrust faulting on the megathrust cycle is distinct, as more both shallower and slower megathrust events arise due to occasional off-megathrust triggering and increased updip locking. This also enhances tsunami hazards, which are amplified due to the steeply dipping fault planes of especially outer rise events.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Modeling the seismic cycle in subduction zones: The role and spatiotemporal occurrence of off-megathrust earthquakes 2014, 41 (4):1194 Geophysical Research Letters
Publisher:
Wiley-Blackwell
Journal:
Geophysical Research Letters
Issue Date:
28-Feb-2014
DOI:
10.1002/2013GL058886
Type:
Article
ISSN:
00948276
Additional Links:
http://doi.wiley.com/10.1002/2013GL058886
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorvan Dinther, Y.en
dc.contributor.authorMai, Paul Martinen
dc.contributor.authorDalguer, L. A.en
dc.contributor.authorGerya, T. V.en
dc.date.accessioned2015-05-03T13:48:30Zen
dc.date.available2015-05-03T13:48:30Zen
dc.date.issued2014-02-28en
dc.identifier.citationModeling the seismic cycle in subduction zones: The role and spatiotemporal occurrence of off-megathrust earthquakes 2014, 41 (4):1194 Geophysical Research Lettersen
dc.identifier.issn00948276en
dc.identifier.doi10.1002/2013GL058886en
dc.identifier.urihttp://hdl.handle.net/10754/552100en
dc.description.abstractShallow off-megathrust subduction events are important in terms of hazard assessment and coseismic energy budget. Their role and spatiotemporal occurrence, however, remain poorly understood. We simulate their spontaneous activation and propagation using a newly developed 2-D, physically consistent, continuum, viscoelastoplastic seismo-thermo-mechanical modeling approach. The characteristics of simulated normal events within the outer rise and splay and normal antithetic events within the wedge resemble seismic and seismological observations in terms of location, geometry, and timing. Their occurrence agrees reasonably well with both long-term analytical predictions based on dynamic Coulomb wedge theory and short-term quasi-static stress changes resulting from the typically triggering megathrust event. The impact of off-megathrust faulting on the megathrust cycle is distinct, as more both shallower and slower megathrust events arise due to occasional off-megathrust triggering and increased updip locking. This also enhances tsunami hazards, which are amplified due to the steeply dipping fault planes of especially outer rise events.en
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://doi.wiley.com/10.1002/2013GL058886en
dc.rightsArchived with thanks to Geophysical Research Lettersen
dc.titleModeling the seismic cycle in subduction zones: The role and spatiotemporal occurrence of off-megathrust earthquakesen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalGeophysical Research Lettersen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionSwiss Seismological Service; ETH Zürich; Zürich Switzerlanden
dc.contributor.institutionSwiss Seismological Service; ETH Zürich; Zürich Switzerlanden
dc.contributor.institutionInstitute of Geophysics; ETH Zürich; Zürich Switzerlanden
kaust.authorMai, Paul Martinen
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