TY  - JOUR
A1  - Kaviani, Ayoub
A1  - Mahmoodabadi, Meysam
A1  - Rümpker, Georg
A1  - Pilia, Simone
A1  - Tatar, Mohammad
A1  - Nilfouroushan, Faramarz
A1  - Yamini-Fard, Farzam
A1  - Moradi, Ali
A1  - Ali, Mohammed Y.
T1  - Mantle-flow diversion beneath the Iranian plateau induced by Zagros' lithospheric keel
T2  - Scientific reports
N2  - Previous investigation of seismic anisotropy indicates the presence of a simple mantle flow regime beneath the Turkish-Anatolian Plateau and Arabian Plate. Numerical modeling suggests that this simple flow is a component of a large-scale global mantle flow associated with the African superplume, which plays a key role in the geodynamic framework of the Arabia-Eurasia continental collision zone. However, the extent and impact of the flow pattern farther east beneath the Iranian Plateau and Zagros remains unclear. While the relatively smoothly varying lithospheric thickness beneath the Anatolian Plateau and Arabian Plate allows progress of the simple mantle flow, the variable lithospheric thickness across the Iranian Plateau is expected to impose additional boundary conditions on the mantle flow field. In this study, for the first time, we use an unprecedented data set of seismic waveforms from a network of 245 seismic stations to examine the mantle flow pattern and lithospheric deformation over the entire region of the Iranian Plateau and Zagros by investigation of seismic anisotropy. We also examine the correlation between the pattern of seismic anisotropy, plate motion using GPS velocities and surface strain fields. Our study reveals a complex pattern of seismic anisotropy that implies a similarly complex mantle flow field. The pattern of seismic anisotropy suggests that the regional simple mantle flow beneath the Arabian Platform and eastern Turkey deflects as a circular flow around the thick Zagros lithosphere. This circular flow merges into a toroidal component beneath the NW Zagros that is likely an indicator of a lateral discontinuity in the lithosphere. Our examination also suggests that the main lithospheric deformation in the Zagros occurs as an axial shortening across the belt, whereas in the eastern Alborz and Kopeh-Dagh a belt-parallel horizontal lithospheric deformation plays a major role.
KW  - Physics
KW  - Solid Earth sciences
Y1  - 2021
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/71584
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-715848
SN  - 2045-2322
N1  - Open Access funding enabled and organized by Projekt DEAL.
N1  - The data from the permanent stations in Iran were provided by the Iranian Seismological Center (Institute of Geophysics, University of Tehran) and International Institute of Earthquake Engineering and Seismology (IIEES). Data from the eastern Turkey was included from Kandilli Observatory Digital Broadband Seismic Network (https://doi.org/10.7914/SN/KO, Kandilli Observatory and Earthquake Research Institute, Bosphorus Univ. (2001)). The data from temporary stations and global permanent stations and few global permanent stations was downloaded via the facilities of IRIS Data Services and specifically the IRIS Data Management Center. IRIS Data Services are funded through the Seismological Facilities for the Advancement of Geoscience and EarthScope (SAGE) Proposal of the National Science Foundation under cooperative agreement EAR1261681. This study was partially supported by the German Research Foundation (DFG) through research grants to AK and MM. The maps shown in Figs. 1, 2, 3, 4 were generated using the Generic Mapping Tools (GMT).
VL  - 11
IS  - art. 2848
SP  - 1
EP  - 12
PB  - Macmillan Publishers Limited, part of Springer Nature
CY  - [London]
ER  -