The seismic cycle at subduction thrusts: 1. Insights from laboratory models

Handle URI:
http://hdl.handle.net/10754/552180
Title:
The seismic cycle at subduction thrusts: 1. Insights from laboratory models
Authors:
Corbi, F.; Funiciello, F.; Moroni, M.; van Dinther, Y.; Mai, Paul Martin ( 0000-0002-9744-4964 ) ; Dalguer, L. A.; Faccenna, C.
Abstract:
Subduction megathrust earthquakes occur at the interface between the subducting and overriding plates. These hazardous phenomena are only partially understood because of the absence of direct observations, the restriction of the instrumental seismic record to the past century, and the limited resolution/completeness of historical to geological archives. To overcome these restrictions, modeling has become a key-tool to study megathrust earthquakes. We present a novel model to investigate the seismic cycle at subduction thrusts using complementary analog (paper 1) and numerical (paper 2) approaches. Here we introduce a simple scaled gelatin-on-sandpaper setup including realistic tectonic loading, spontaneous rupture nucleation, and viscoelastic response of the lithosphere. Particle image velocimetry allows to derive model deformation and earthquake source parameters. Analog earthquakes are characterized by “quasi-periodic” recurrence. Consistent with elastic theory, the interseismic stage shows rearward motion, subsidence in the outer wedge and uplift of the “coastal area” as a response of locked plate interface at shallow depth. The coseismic stage exhibits order of magnitude higher velocities and reversal of the interseismic deformation pattern in the seaward direction, subsidence of the coastal area, and uplift in the outer wedge. Like natural earthquakes, analog earthquakes generally nucleate in the deeper portion of the rupture area and preferentially propagate upward in a crack-like fashion. Scaled rupture width-slip proportionality and seismic moment-duration scaling verifies dynamic similarities with earthquakes. Experimental repeatability is statistically verified. Comparing analog results with natural observations, we conclude that this technique is suitable for investigating the parameter space influencing the subduction interplate seismic cycle.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
The seismic cycle at subduction thrusts: 1. Insights from laboratory models 2013, 118 (4):1483 Journal of Geophysical Research: Solid Earth
Publisher:
Wiley-Blackwell
Journal:
Journal of Geophysical Research: Solid Earth
Issue Date:
Apr-2013
DOI:
10.1029/2012JB009481
Type:
Article
ISSN:
21699313
Additional Links:
http://doi.wiley.com/10.1029/2012JB009481
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorCorbi, F.en
dc.contributor.authorFuniciello, F.en
dc.contributor.authorMoroni, M.en
dc.contributor.authorvan Dinther, Y.en
dc.contributor.authorMai, Paul Martinen
dc.contributor.authorDalguer, L. A.en
dc.contributor.authorFaccenna, C.en
dc.date.accessioned2015-05-04T16:37:48Zen
dc.date.available2015-05-04T16:37:48Zen
dc.date.issued2013-04en
dc.identifier.citationThe seismic cycle at subduction thrusts: 1. Insights from laboratory models 2013, 118 (4):1483 Journal of Geophysical Research: Solid Earthen
dc.identifier.issn21699313en
dc.identifier.doi10.1029/2012JB009481en
dc.identifier.urihttp://hdl.handle.net/10754/552180en
dc.description.abstractSubduction megathrust earthquakes occur at the interface between the subducting and overriding plates. These hazardous phenomena are only partially understood because of the absence of direct observations, the restriction of the instrumental seismic record to the past century, and the limited resolution/completeness of historical to geological archives. To overcome these restrictions, modeling has become a key-tool to study megathrust earthquakes. We present a novel model to investigate the seismic cycle at subduction thrusts using complementary analog (paper 1) and numerical (paper 2) approaches. Here we introduce a simple scaled gelatin-on-sandpaper setup including realistic tectonic loading, spontaneous rupture nucleation, and viscoelastic response of the lithosphere. Particle image velocimetry allows to derive model deformation and earthquake source parameters. Analog earthquakes are characterized by “quasi-periodic” recurrence. Consistent with elastic theory, the interseismic stage shows rearward motion, subsidence in the outer wedge and uplift of the “coastal area” as a response of locked plate interface at shallow depth. The coseismic stage exhibits order of magnitude higher velocities and reversal of the interseismic deformation pattern in the seaward direction, subsidence of the coastal area, and uplift in the outer wedge. Like natural earthquakes, analog earthquakes generally nucleate in the deeper portion of the rupture area and preferentially propagate upward in a crack-like fashion. Scaled rupture width-slip proportionality and seismic moment-duration scaling verifies dynamic similarities with earthquakes. Experimental repeatability is statistically verified. Comparing analog results with natural observations, we conclude that this technique is suitable for investigating the parameter space influencing the subduction interplate seismic cycle.en
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://doi.wiley.com/10.1029/2012JB009481en
dc.rightsArchived with thanks to Journal of Geophysical Research: Solid Earthen
dc.titleThe seismic cycle at subduction thrusts: 1. Insights from laboratory modelsen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalJournal of Geophysical Research: Solid Earthen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionLET-Laboratory of Experimental Tectonics; Università “Roma Tre,”; Roma; Italyen
dc.contributor.institutionLET-Laboratory of Experimental Tectonics; Università “Roma Tre,”; Roma; Italyen
dc.contributor.institutionDICEA; Sapienza Università di Roma; Roma; Italyen
dc.contributor.institutionSwiss Seismological Service; ETH Zürich; Zürich; Switzerlanden
dc.contributor.institutionSwiss Seismological Service; ETH Zürich; Zürich; Switzerlanden
dc.contributor.institutionLET-Laboratory of Experimental Tectonics; Università “Roma Tre,”; Roma; Italyen
kaust.authorMai, Paul Martinen
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