Show simple item record

dc.contributor.authorTang, Zheng
dc.contributor.authorMai, Paul Martin
dc.contributor.authorJulià, Jordi
dc.contributor.authorZahran, Hani
dc.date.accessioned2019-05-14T12:52:45Z
dc.date.available2019-05-14T12:52:45Z
dc.date.issued2019-05-13
dc.identifier.citationTang Z, Mai PM, Julià J, Zahran H (2019) Shear Velocity Structure Beneath Saudi Arabia From the Joint Inversion of P and S Wave Receiver Functions, and Rayleigh Wave Group Velocity Dispersion Data. Journal of Geophysical Research: Solid Earth. Available: http://dx.doi.org/10.1029/2018jb017131.
dc.identifier.issn2169-9313
dc.identifier.issn2169-9356
dc.identifier.doi10.1029/2018jb017131
dc.identifier.urihttp://hdl.handle.net/10754/652877
dc.description.abstractWe develop a new 3-D shear velocity model for the lithosphere and sublithospheric mantle under Saudi Arabia by jointly inverting P wave receiver functions, S wave receiver functions, and fundamental-mode Rayleigh wave group velocities. P and S receiver functions are calculated from earthquakes recorded between 2012 and 2015 at 156 Saudi National Seismic Network stations operated by the Saudi Geological Survey. Rayleigh wave dispersion data are extracted from independent tomographic studies. Our model reveals significant lateral variations in crustal and upper-mantle S velocity below Saudi Arabia. Particularly, a low-velocity zone, with minimum S velocity of ~4.0 km/s in the depth range of 70-190 km, is observed under the Arabian Shield coinciding with Cenozoic surface volcanism. The low-velocity zone is found consistent with the presence of partial melts in the mantle and interpreted as a potential deep magma source for the volcanism in western Arabia. We propose that magmas responsible for the Arabian volcanism may be derived from multiple sources. Both lithospheric thinning and the Afar plume trigger magma production beneath southwestern Arabia, while decompression melting caused by the lithospheric thinning may be the main factor in the central and northern portions. Furthermore, we find evidence for localized crustal low shear velocity anomalies (2–4% reductions) that appear spatially correlated to the volcanism; these may be due to fractures caused by magma ascent and small amounts of partial melt in the crust. This spatial distribution of S velocity reductions may indicate the plumbing system for magma ascent underneath western Arabia.
dc.description.sponsorshipWe are grateful to Mahmoud Salam, Wael Raddidi, and the entire team at the National Center for Earthquakes and Volcanoes (NCEV) at the Saudi Geological Survey (SGS) for sharing the broadband teleseismic data. We acknowledge logistical support from Universidade Federal do Rio Grande do Norte (UFRN) in hosting Z. T. during two research collaboration visits. We also thank two anonymous reviewers for their constructive comments that help to improve the manuscript. The research presented in the paper is supported by funding from King Abdullah University of Science and Technology (KAUST), grant BAS/1/1339-01-01. The raw seismic data are from the SGS. All the receiver function and surface wave dispersion data are available from the Computational Earthquake Seismology (CES) group (http://equake-rc.info/research-data/) at KAUST.
dc.publisherAmerican Geophysical Union (AGU)
dc.relation.urlhttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JB017131
dc.rightsThis is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectreceiver function
dc.subjectjoint inversion
dc.subjectshear wave velocity
dc.subjectCenozoic volcanism
dc.subjectSaudi Arabia
dc.titleShear-velocity structure beneath Saudi Arabia from the joint inversion of P- and S-wave receiver functions, and Rayleigh-wave group-velocity dispersion data
dc.typeArticle
dc.contributor.departmentComputational Earthquake Seismology (CES) Research Group
dc.contributor.departmentEarth Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalJournal of Geophysical Research: Solid Earth
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionUniversidade Federal do Rio Grando do Norte (UFRN) Natal Brazil
dc.contributor.institutionSaudi Geological Survey (SGS) Jeddah Saudi Arabia
kaust.personTang, Zheng
kaust.personMai, Paul Martin
kaust.grant.numberBAS/1/1339-01-01
refterms.dateFOA2019-05-14T13:09:51Z


Files in this item

Thumbnail
Name:
Tang_et_al-2019-Journal_of_Geophysical_Research__Solid_Earth.pdf
Size:
11.51Mb
Format:
PDF
Description:
Published version
Thumbnail
Name:
jgrb53442-sup-0001-2018jb017131-si.pdf
Size:
2.143Mb
Format:
PDF
Description:
Supplemental files

This item appears in the following Collection(s)

Show simple item record

This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Except where otherwise noted, this item's license is described as This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.