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dc.contributor.authorPriestley, Keith
dc.contributor.authorSobouti, Farhad
dc.contributor.authorMokhtarzadeh, Rahil
dc.contributor.authorIrandoust, Mohsen
dc.contributor.authorGhods, Reza
dc.contributor.authorMotaghi, Khalil
dc.contributor.authorHo, Tak
dc.date.accessioned2022-01-10T12:46:06Z
dc.date.available2022-01-10T12:46:06Z
dc.date.issued2022-01
dc.date.submitted2021-08-03
dc.identifier.issn2169-9313
dc.identifier.otherjgrb55383
dc.identifier.other2021jb022942
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/332493
dc.descriptionFunder: Institute for Advanced Studies in Basic Sciences; Id: http://dx.doi.org/10.13039/501100007513
dc.description.abstractAbstract: The Makran Subduction Zone is the primary seismic/tsunami hazard of the northwestern Indian Ocean, but little is known of its on‐shore seismic structure. We derived a shear wave velocity model extending to > $ > $ 100 km depth beneath a ∼400 km‐long seismic profile oriented parallel to the convergence vector of the Arabian Sea Plate. Receiver function/surface wave analysis shows that the average structure in the coastal region comprises a ∼22–28 km‐thick low wavespeed sedimentary cover and a 6–8 km‐thick gradient zone overlying > $ > $ 100 km‐thick high wavespeed upper mantle. The ocean‐basement interface dips gently northward, remaining a positive impedance contrast to ∼50 km depth at ∼250 km north of the coast where it disappears as the basaltic/gabbroic oceanic crust has probably transformed to eclogite. Further north, a weak arrival at ∼5 s in the receiver functions appears, grading northward into the Moho arrival of the continental Iranian Plateau. This disruption in the seismic signature of the Moho occurs in the forearc region where the dip of the subducting oceanic plate steepens. The southern Iranian Plateau's continental crust has an average V s of 3.55 ± 0.05 km s−1, an almost flat Moho 40–45 km deep, and a sub‐Moho mantle V s of 3.75 ± 0.05 km s−1 in the 50–80 km depth range. Weak Moho conversions probably result from ∼20% serpentinization of peridotite in the mantle wedge. Receiver functions indicate a flat continental Moho – no crustal root beneath the high topography region of the volcanic belt, which therefore must be compensated by low upper mantle densities. The high V p /V s ratio observed for the mantle wedge suggests ∼1%–2% partial melt.
dc.languageen
dc.publisherAmerican Geophysical Union (AGU)
dc.subjectSeismology
dc.subjectEXPLORATION GEOPHYSICS
dc.subjectGravity methods
dc.subjectGEOCHEMISTRY
dc.subjectSubduction zone processes
dc.subjectGEODESY AND GRAVITY
dc.subjectTransient deformation
dc.subjectTectonic deformation
dc.subjectTime variable gravity
dc.subjectGravity anomalies and Earth structure
dc.subjectSatellite geodesy: results
dc.subjectSeismic cycle related deformations
dc.subjectHYDROLOGY
dc.subjectEstimation and forecasting
dc.subjectINFORMATICS
dc.subjectForecasting
dc.subjectIONOSPHERE
dc.subjectMAGNETOSPHERIC PHYSICS
dc.subjectMARINE GEOLOGY AND GEOPHYSICS
dc.subjectPlate tectonics
dc.subjectMATHEMATICAL GEOPHYSICS
dc.subjectPrediction
dc.subjectProbabilistic forecasting
dc.subjectMINERALOGY AND PETROLOGY
dc.subjectOCEANOGRAPHY: GENERAL
dc.subjectOcean predictability and prediction
dc.subjectNATURAL HAZARDS
dc.subjectMonitoring, forecasting, prediction
dc.subjectPOLICY SCIENCES
dc.subjectRADIO SCIENCE
dc.subjectInterferometry
dc.subjectIonospheric physics
dc.subjectSEISMOLOGY
dc.subjectContinental crust
dc.subjectOceanic crust
dc.subjectSubduction zones
dc.subjectEarthquake dynamics
dc.subjectEarthquake source observations
dc.subjectEarthquake interaction, forecasting, and prediction
dc.subjectSeismicity and tectonics
dc.subjectSPACE WEATHER
dc.subjectPolicy
dc.subjectTECTONOPHYSICS
dc.subjectPlate boundary: general
dc.subjectPlate motions: general
dc.subjectPlate motions: past
dc.subjectPlate motions: present and recent
dc.subjectVOLCANOLOGY
dc.subjectResearch Article
dc.subjectMakran subduction zone
dc.subjectaccretionary prism
dc.subjectoceanic crust
dc.subjectcontinetal crust
dc.subjectmantle wedge
dc.titleNew Constraints for the On‐Shore Makran Subduction Zone Crustal Structure
dc.typeArticle
dc.date.updated2022-01-10T12:46:05Z
prism.issueIdentifier1
prism.publicationNameJournal of Geophysical Research: Solid Earth
prism.volume127
dc.identifier.doi10.17863/CAM.79943
dcterms.dateAccepted2021-12-08
rioxxterms.versionofrecord10.1029/2021jb022942
rioxxterms.versionAO
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
dc.contributor.orcidPriestley, Keith [0000-0001-6515-1318]
dc.contributor.orcidMotaghi, Khalil [0000-0003-2653-5188]
dc.identifier.eissn2169-9356
pubs.funder-project-idRoyal Society (ICA/R1/180234)
pubs.funder-project-idNatural Environment Research Council (NERC) (NE/J019895/1)
cam.issuedOnline2022-01-03


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