Spatial variations of effective elastic thickness of Eastern Arabia: Implications for lithospheric weakening in the Oman-UAE mountain belt

Ismaiel, M.; Ali, Mohammed Y.; Watts, A. B.; Barkat, B.

doi:10.1016/j.tecto.2023.229995

Cited by 1 publication

(1 citation statement)

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“…Moving eastwards, the Moho depths decrease to 30-35 km, and an increased lower crustal Vs value suggests the presence of mafic intrusions. The crustal thickness beneath the peninsula in the northwestern part of the study area was studied using gravity and magnetic modeling (Ali et al, 2020;Geng et al, 2022;Hansen et al, 2007;Ismaiel, Ali, Watts, & Barkat, 2023), teleseismic receiver function (Ismaiel, Ali, Pilia, et al, 2023), and wide-angle seismic measurements (Pilia et al, 2021). These studies reported crustal thickness vayring in the range of 32-38 km beneath the foreland basin, which increases to 40-52 km beneath the Semail ophiolites and decreases again toward the Gulf of Oman.…”

Section: Geological Settingmentioning

confidence: 99%

Discriminating Lithospheric and Asthenospheric Anisotropy Beneath Northern Oman: Sharp Contrast Observed at the Semail Gap Fault Zone

Komeazi,

Kaviani,

Rümpker

et al. 2024

JGR Solid Earth

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To gain a deeper understanding of the extensive and varied lithospheric deformations beneath northern Oman, we examine seismic anisotropy in this region using splitting analysis of teleseismic shear wave data. Our study utilizes data from a dense network consisting of 13 permanent and 45 temporary seismic stations, which were operational for approximately 2.5 years starting from October 2013. By examining the azimuthal distribution of shear wave splitting (SWS) parameters, we were able to divide the study area into three sub‐regions. The stations located to the west of the Hawasina window exhibit relatively azimuthally invariant SWS parameters suggesting a single anisotropic layer. On the other hand, most of the stations located in the central and eastern regions display variations versus back‐azimuth, indicating the potential presence of depth‐dependent anisotropy. The General NW‐SE trend of the Fast Polarization Directions (FPDs) of the one‐layer anisotropy in the west and FPDs of the upper layers in the east is concordant with the strike of the structures resulting from the collision between the continental and oceanic plates. A clear contrast in SWS parameters is observed in the Semail Gap Fault Zone (SGFZ), suggesting that the SGFZ can be a lithospheric‐scale structure that hampers the intrusion of mafic magma from the southeast. Furthermore, the FPDs of the lower layer in the east exhibit an NE‐SW trend, which may be indicative of the large‐scale mantle flow resulting from the present‐day plate motion.

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