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Seismic tomography of the North Anatolian Fault: New insights into structural heterogeneity along a continental strike‐slip fault
Author(s) -
Papaleo Elvira,
Cornwell David G.,
Rawlinson Nicholas
Publication year - 2017
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2017gl072726
Subject(s) - north anatolian fault , geology , seismology , lithosphere , crust , shear zone , continental crust , mantle (geology) , strike slip tectonics , seismic tomography , fault (geology) , structural geology , geophysics , tectonics
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.