Quantifying slip balance in the earthquake cycle: Coseismic slip model constrained by interseismic coupling

Handle URI:
http://hdl.handle.net/10754/582875
Title:
Quantifying slip balance in the earthquake cycle: Coseismic slip model constrained by interseismic coupling
Authors:
Wang, Lifeng; Hainzl, Sebastian; Mai, Paul Martin ( 0000-0002-9744-4964 )
Abstract:
The long-term slip on faults has to follow, on average, the plate motion, while slip deficit is accumulated over shorter time scales (e.g., between the large earthquakes). Accumulated slip deficits eventually have to be released by earthquakes and aseismic processes. In this study, we propose a new inversion approach for coseismic slip, taking interseismic slip deficit as prior information. We assume a linear correlation between coseismic slip and interseismic slip deficit, and invert for the coefficients that link the coseismic displacements to the required strain accumulation time and seismic release level of the earthquake. We apply our approach to the 2011 M9 Tohoku-Oki earthquake and the 2004 M6 Parkfield earthquake. Under the assumption that the largest slip almost fully releases the local strain (as indicated by borehole measurements, Lin et al., 2013), our results suggest that the strain accumulated along the Tohoku-Oki earthquake segment has been almost fully released during the 2011 M9 rupture. The remaining slip deficit can be attributed to the postseismic processes. Similar conclusions can be drawn for the 2004 M6 Parkfield earthquake. We also estimate the required time of strain accumulation for the 2004 M6 Parkfield earthquake to be ~25 years (confidence interval of [17, 43] years), consistent with the observed average recurrence time of ~22 years for M6 earthquakes in Parkfield. For the Tohoku-Oki earthquake, we estimate the recurrence time of~500-700 years. This new inversion approach for evaluating slip balance can be generally applied to any earthquake for which dense geodetic measurements are available.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Quantifying slip balance in the earthquake cycle: Coseismic slip model constrained by interseismic coupling 2015:n/a Journal of Geophysical Research: Solid Earth
Publisher:
Wiley-Blackwell
Journal:
Journal of Geophysical Research: Solid Earth
Issue Date:
11-Nov-2015
DOI:
10.1002/2015JB011987
Type:
Article
ISSN:
21699313
Additional Links:
http://doi.wiley.com/10.1002/2015JB011987
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorWang, Lifengen
dc.contributor.authorHainzl, Sebastianen
dc.contributor.authorMai, Paul Martinen
dc.date.accessioned2015-11-29T08:47:35Zen
dc.date.available2015-11-29T08:47:35Zen
dc.date.issued2015-11-11en
dc.identifier.citationQuantifying slip balance in the earthquake cycle: Coseismic slip model constrained by interseismic coupling 2015:n/a Journal of Geophysical Research: Solid Earthen
dc.identifier.issn21699313en
dc.identifier.doi10.1002/2015JB011987en
dc.identifier.urihttp://hdl.handle.net/10754/582875en
dc.description.abstractThe long-term slip on faults has to follow, on average, the plate motion, while slip deficit is accumulated over shorter time scales (e.g., between the large earthquakes). Accumulated slip deficits eventually have to be released by earthquakes and aseismic processes. In this study, we propose a new inversion approach for coseismic slip, taking interseismic slip deficit as prior information. We assume a linear correlation between coseismic slip and interseismic slip deficit, and invert for the coefficients that link the coseismic displacements to the required strain accumulation time and seismic release level of the earthquake. We apply our approach to the 2011 M9 Tohoku-Oki earthquake and the 2004 M6 Parkfield earthquake. Under the assumption that the largest slip almost fully releases the local strain (as indicated by borehole measurements, Lin et al., 2013), our results suggest that the strain accumulated along the Tohoku-Oki earthquake segment has been almost fully released during the 2011 M9 rupture. The remaining slip deficit can be attributed to the postseismic processes. Similar conclusions can be drawn for the 2004 M6 Parkfield earthquake. We also estimate the required time of strain accumulation for the 2004 M6 Parkfield earthquake to be ~25 years (confidence interval of [17, 43] years), consistent with the observed average recurrence time of ~22 years for M6 earthquakes in Parkfield. For the Tohoku-Oki earthquake, we estimate the recurrence time of~500-700 years. This new inversion approach for evaluating slip balance can be generally applied to any earthquake for which dense geodetic measurements are available.en
dc.language.isoenen
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://doi.wiley.com/10.1002/2015JB011987en
dc.rightsArchived with thanks to Journal of Geophysical Research: Solid Earth. Accepted for publication in Journal of Geophysical Research: Solid Earth. Copyright (2015) American Geophysical Union. Further reproduction or electronic distribution is not permitted.en
dc.titleQuantifying slip balance in the earthquake cycle: Coseismic slip model constrained by interseismic couplingen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalJournal of Geophysical Research: Solid Earthen
dc.eprint.versionPost-printen
dc.contributor.institutionState Key Laboratory of Earthquake Dynamics; Institute of Geology, China Earthquake Administration; Chinaen
dc.contributor.institutionDeutsches GeoForschungsZentrum GFZ; Germanyen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorMai, Paul Martinen
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