Item talk:Q151362

From geokb

DOI:

 DOI: 10.1002/2016jb013124
 ISSN:
 - 2169-9313
 - 2169-9356
 URL: http://dx.doi.org/10.1002/2016JB013124
 abstract: "<jats:title>Abstract</jats:title><jats:p>Great subduction earthquakes\
   \ are thought to rupture portions of the megathrust, where interseismic coupling\
   \ is high and velocity\u2010weakening frictional behavior is dominant, releasing\
   \ elastic deformation accrued over a seismic cycle. Conversely, postseismic afterslip\
   \ is assumed to occur primarily in regions of velocity\u2010strengthening frictional\
   \ characteristics that may correlate with lower interseismic coupling. However,\
   \ it remains unclear if fixed frictional properties of the subduction interface,\
   \ coseismic or aftershock\u2010induced stress redistribution, or other factors\
   \ control the spatial distribution of afterslip. Here we use interferometric synthetic\
   \ aperture radar and Global Position System observations to map the distribution\
   \ of coseismic slip of the 2015 <jats:italic>M<jats:sub>w</jats:sub></jats:italic>\
   \ 8.3 Illapel, Chile, earthquake and afterslip within the first 38\u2009days following\
   \ the earthquake. We find that afterslip overlaps the coseismic slip area and\
   \ propagates along\u2010strike into regions of both high and moderate interseismic\
   \ coupling. The significance of these observations, however, is tempered by the\
   \ limited resolution of geodetic inversions for both slip and coupling. Additional\
   \ afterslip imaged deeper on the fault surface bounds a discrete region of deep\
   \ coseismic slip, and both contribute to net uplift of the Chilean Coastal Cordillera.\
   \ A simple partitioning of the subduction interface into regions of fixed frictional\
   \ properties cannot reconcile our geodetic observations. Instead, stress heterogeneities,\
   \ either preexisting or induced by the earthquake, likely provide the primary\
   \ control on the afterslip distribution for this subduction zone earthquake. We\
   \ also explore the occurrence of coseismic and postseismic coastal uplift in this\
   \ sequence and its implications for recent hypotheses concerning the source of\
   \ permanent coastal uplift along subduction zones.</jats:p>"
 alternative-id:
 - 10.1002/2016JB013124
 author:
 - affiliation:
   - name: Department of Earth and Environmental Sciences University of Iowa  Iowa
       City Iowa USA
   family: Barnhart
   given: William D.
   sequence: first
 - affiliation:
   - name: Earthquake Science Center U.S. Geological Survey  Menlo Park California
       USA
   family: Murray
   given: Jessica R.
   sequence: additional
 - affiliation:
   - name: Geological Hazards Science Center U.S. Geological Survey  Golden Colorado
       USA
   family: Briggs
   given: Richard W.
   sequence: additional
 - affiliation:
   - name: Department of Geological Sciences University of Missouri  Columbia Missouri
       USA
   family: Gomez
   given: Francisco
   sequence: additional
 - affiliation:
   - name: Department of Geological Sciences University of Missouri  Columbia Missouri
       USA
   family: Miles
   given: Charles P. J.
   sequence: additional
 - affiliation:
   - name: Earthquake Science Center U.S. Geological Survey  Menlo Park California
       USA
   family: Svarc
   given: Jerry
   sequence: additional
 - affiliation:
   - name: "Centro Sismol\xF3gico Nacional Universidad de Chile  Santiago Chile"
   family: Riquelme
   given: Sebastian
   sequence: additional
 - affiliation:
   - name: Department of Earth and Environmental Sciences University of Iowa  Iowa
       City Iowa USA
   family: Stressler
   given: Bryan J.
   sequence: additional
 container-title: 'Journal of Geophysical Research: Solid Earth'
 container-title-short: JGR Solid Earth
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   date-parts:
   - - 2016
     - 7
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   date-time: '2016-07-27T15:49:17Z'
   timestamp: 1469634557000
 dateModified: '2024-06-01T13:16:31Z'
 deposited:
   date-parts:
   - - 2023
     - 9
     - 9
   date-time: '2023-09-09T14:12:31Z'
   timestamp: 1694268751000
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   date-time: '2024-06-01T13:16:31Z'
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 title: 'Coseismic slip and early afterslip of the 2015 Illapel, Chile, earthquake:
   Implications for frictional heterogeneity and coastal uplift'
 type: journal-article
 volume: '121'

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 display_name: 'Coseismic slip and early afterslip of the 2015 Illapel, Chile, earthquake:
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   name: Chile
 abstract: "Great subduction earthquakes are thought to rupture portions of the megathrust,\
   \ where interseismic coupling is high and velocity-weakening frictional behavior\
   \ is dominant, releasing elastic deformation accrued over a seismic cycle. Conversely,\
   \ postseismic afterslip is assumed to occur primarily in regions of velocity-strengthening\
   \ frictional characteristics that may correlate with lower interseismic coupling.\
   \ However, it remains unclear if fixed frictional properties of the subduction\
   \ interface, coseismic or aftershock-induced stress redistribution, or other factors\
   \ control the spatial distribution of afterslip. Here we use interferometric synthetic\
   \ aperture radar and Global Position System observations to map the distribution\
   \ of coseismic slip of the 2015 Mw 8.3 Illapel, Chile, earthquake and afterslip\
   \ within the first 38\u2009days following the earthquake. We find that afterslip\
   \ overlaps the coseismic slip area and propagates along-strike into regions of\
   \ both high and moderate interseismic coupling. The significance of these observations,\
   \ however, is tempered by the limited resolution of geodetic inversions for both\
   \ slip and coupling. Additional afterslip imaged deeper on the fault surface bounds\
   \ a discrete region of deep coseismic slip, and both contribute to net uplift\
   \ of the Chilean Coastal Cordillera. A simple partitioning of the subduction interface\
   \ into regions of fixed frictional properties cannot reconcile our geodetic observations.\
   \ Instead, stress heterogeneities, either preexisting or induced by the earthquake,\
   \ likely provide the primary control on the afterslip distribution for this subduction\
   \ zone earthquake. We also explore the occurrence of coseismic and postseismic\
   \ coastal uplift in this sequence and its implications for recent hypotheses concerning\
   \ the source of permanent coastal uplift along subduction zones."
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     name: Geologic Hazards Science Center
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   givenName: William D.
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     name: Earthquake Science Center
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     name: Geologic Hazards Science Center
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   name: Briggs, Richard W. rbriggs@usgs.gov
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     name: Earthquake Science Center
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     value: 0000-0002-2802-4528
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   name: Svarc, Jerry L. jsvarc@usgs.gov
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   identifier: []
   name: "Riquelme, Seb\xE1stian"
   position: 7
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   familyName: Stressler
   givenName: Bryan J.
   identifier: []
   name: Stressler, Bryan J.
   position: 8
 dateModified: '2017-03-13T13:54:13'
 datePublished: '2016'
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     propertyID: GeoKB
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   name: Earthquake Science Center
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   value: 10.1002/2016JB013124
 name: 'Coseismic slip and early afterslip of the 2015 Illapel, Chile, earthquake:
   Implications for frictional heterogeneity and coastal uplift'
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   name: AGU Publications