Seismic tomography of the North Anatolian Fault: New insights into structural heterogeneity along a continental strike-slip fault

Papaleo, E. and Cornwell, D. G. and Rawlinson, N. (2017) Seismic tomography of the North Anatolian Fault: New insights into structural heterogeneity along a continental strike-slip fault. Geophysical Research Letters, 44 (5). ISSN 0094-8276, ESSN: 1944-8007 DOI 10.1002/2017GL072726

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Abstract

Knowledge of the structure of continental strike-slip faults within the lithosphere is essential to understand where the deformation occurs and how strain localizes with depth. With the aim to improve the constraints on the lower crust and upper mantle structure of a major continental strike-slip fault, we present a high-resolution teleseismic tomography of the North Anatolian Fault Zone (NAFZ) in Turkey. Our results highlight the presence of a relatively high velocity body between the two branches of the fault and significant along-strike variations in the NAFZ velocity structure over distances of ∼20 km. We interpret these findings as evidence of laterally variable strain focussing caused by preexisting heterogeneity. Low velocities observed in the crust and upper mantle beneath the NAFZ support the presence of a narrow shear zone widening in the upper mantle, where we constrain its width to be ∼50 km.

Item Type: Article
Uncontrolled Keywords: NILAREP; IA72;
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
08 - Green Open Access
Journal or Publication Title: Geophysical Research Letters
Volume: 44
Identification Number: 10.1002/2017GL072726
Depositing User: Sarah Humbert
Date Deposited: 06 Apr 2017 17:22
Last Modified: 28 Apr 2017 16:37
URI: http://eprints.esc.cam.ac.uk/id/eprint/3865

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