caa a22 4500 463172213 CHVBK 20180406164816.0 cr unu---uuuuu 170326e20071001xx s 000 0 eng 10.1007/s10950-007-9062-2 doi (NATIONALLICENCE)springer-10.1007/s10950-007-9062-2 Seismic velocity and Poisson's ratio tomography of the crust beneath southwest Anatolia: an insight into the occurrence of large earthquakes [Elektronische Daten] [Mohamed Salah, Sakir Sahin, Cem Destici] The western part of Anatolia is one of the most seismically and tectonically active continental regions in the world, and much of it has been undergoing NS-directed extensional deformation since the Early Miocene. In this study, we determine 3-D tomographic images of the crust under the southwestern part of the North Anatolian Fault Zone by inverting a large number of arrival time data of P and S waves. From the obtained P- and S-wave velocity models, we estimated the Poisson's ratio structures for a more reliable interpretation of the obtained anomalies. Our tomographic results confirmed the major tectonic features detected by previous studies and revealed new structural heterogeneities related to the active seismotectonics of the studied area. High P-wave velocity anomalies are recognized near the surface, while at deeper crustal layers, low P-wave velocities are widely distributed. The crustal S-wave velocity and Poisson's ratio exhibit more structural heterogeneities compared to the P-wave velocity structure. Microearthquake activity is intense along highly heterogeneous zones in the southwestern part, which is characterized by low to high P-wave velocity, low S-wave velocity, and high Poisson's ratio anomalies. Large earthquakes are also concentrated in zones dominated by low velocities and low to high Poisson's ratios. Results of the checkerboard and synthetic tests indicate that the imaged anomalies are reliable features down to a depth of 25km. Moreover, they are consistent with many geological and geophysical results obtained by other researchers along the southwestern part of the North Anatolian Fault Zone. Springer Science+Business Media B.V., 2007 Crustal structure nationallicence Seismic tomography nationallicence Seismic wave velocity nationallicence Poisson's ratio nationallicence Southwest Anatolia nationallicence Salah Mohamed Geophysical Department, Faculty of Engineering and Architecture, Suleyman Demirel University, 32260, Cunur, Isparta, Turkey aut Sahin Sakir Geophysical Department, Faculty of Engineering and Architecture, Suleyman Demirel University, 32260, Cunur, Isparta, Turkey aut Destici Cem Geophysical Department, Faculty of Engineering and Architecture, Suleyman Demirel University, 32260, Cunur, Isparta, Turkey aut Journal of Seismology Springer Netherlands 11/4(2007-10-01), 415-432 1383-4649 11:4<415 2007 11 10950 https://doi.org/10.1007/s10950-007-9062-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10950-007-9062-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Salah Mohamed Geophysical Department, Faculty of Engineering and Architecture, Suleyman Demirel University, 32260, Cunur, Isparta, Turkey aut NATIONALLICENCE 700 1- Sahin Sakir Geophysical Department, Faculty of Engineering and Architecture, Suleyman Demirel University, 32260, Cunur, Isparta, Turkey aut NATIONALLICENCE 700 1- Destici Cem Geophysical Department, Faculty of Engineering and Architecture, Suleyman Demirel University, 32260, Cunur, Isparta, Turkey aut NATIONALLICENCE 773 0- Journal of Seismology Springer Netherlands 11/4(2007-10-01), 415-432 1383-4649 11:4<415 2007 11 10950 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 458074578 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer