Crustal Velocity Structure of Turkey from Ambient Noise Tomography

Date

2009-12-14

Author

Warren, Linda M.
Beck, Susan L.
Biryol, C. Berk
Zandt, George
Özacar, Atilla Arda
Yang, Yingjie

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

258
views

0
downloads

In eastern Turkey, the ongoing convergence of the Arabian and African plates with Eurasia has resulted in the westward extrusion of the Anatolian plate. To better understand the current state and the tectonic history of this region, we image crust and uppermost mantle structure with ambient noise tomography. Our study area extends from longitudes of 32°-44°E. We use continuous data from two temporary seismic deployments, our 2006-2008 North Anatolian Fault Seismic Experiment and the 1999-2001 Eastern Turkey Seismic Experiment, as well as from additional seismic stations in the region. We compute daily cross-correlations of noise records between all station pairs and stack them over the entire time period for which they are available, as well as in seasonal subsets, to obtain interstation empirical Green's functions. After selecting interstation cross-correlations with high signal-to-noise ratios and measuring interstation phase velocities, we compute phase velocity maps at periods ranging from 8-40 s. At all periods, the phase velocity maps are similar for winter and summer subsets of the data, indicating that seasonal variations in noise sources do not bias our results. Across the study area, we invert the phase velocity estimates for shear velocity as a function of depth. The shear velocity model, which extends to 50 km depth, highlights tectonic features apparent at the surface: the Eastern Anatolian Volcanic Province is a prominent low-velocity anomaly whereas the Kirsehir Block has relatively fast velocities. In addition, in the southeastern part of our study area, we image a high velocity region below 20 km depth which may be the northern tip of the underthrusting Arabian plate. There are velocity jumps across the Central and East Anatolian Fault Zones. The North Anatolian Fault Zone appears as a fast anomaly in the upper crust.

URI

http://abstractsearch.agu.org/meetings/2009/FM/sections/T/sessions/T51C/abstracts/T51C-1538.html
https://hdl.handle.net/11511/94690

Conference Name

American Geophysical Union (AGU) 2009 Fall Meeting

Collections

Department of Geological Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Crustal velocity structure of Central and Eastern Turkey from ambient noise tomography Warren, Linda M.; Beck, Susan L.; Biryol, C. Berk; Zandt, George; Özacar, Atilla Arda; Yang, Yingjie (Oxford University Press (OUP), 2013-09-01) In eastern Turkey, the ongoing convergence of the Arabian and African plates with Eurasia has resulted in the westward extrusion of the Anatolian Plate. To better understand the current state and the tectonic history of this region, we image crust and uppermost mantle structure with ambient noise tomography. Our study area extends from longitudes of 32 degrees to 44 degrees E. We use continuous data from two temporary seismic deployments, our 2006-2008 North Anatolian Fault Passive Seismic Experiment and th...
Ambient Noise Tomography Around the Central North Anatolian Fault Turkey Warren, Linda M.; Beck, Susan L.; Biryol, C. Berk; Zandt, George; Özacar, Atilla Arda; Yang, Yingjie (2008-12-15) In eastern Turkey, the ongoing convergence of the Arabian and African plates with Eurasia has resulted in the westward extrusion of the Anatolian plate. The North Anatolian Fault (NAF), which forms the northern margin of the Anatolian plate, appears to be a nascent continental transform plate boundary. To study the evolution of such a plate boundary, both at the surface and at depth, we deployed a network of 39 broadband seismometers around the central portion of the NAF from July 2006 through April 2008. W...
Geological and Geochemical Evolution of the Quaternary Suphan Stratovolcano, Eastern Anatolia, Turkey: Evidence for the Lithosphere-Asthenosphere Interaction in Post-Collisional Volcanism Özdemir, Yavuz; Güleç, Nilgün Türkan (Oxford University Press (OUP), 2014-01-01) The Suphan stratovolcano is one of the major Quaternary eruption centers of post-collisional volcanism in eastern Anatolia, located in the zone of convergence between the Arabian and the Anatolian plates. We document the geological and geochemical evolution of Suphan in terms of volcanostratigraphy, geochronology (Ar-40-Ar-39), isotope composition (Sr, Nd, Pb) and bulk-rock geochemistry. Our new Ar-40-Ar-39 data, along with previously published K/Ar ages, indicate an age of 0 center dot 76-0 center dot 06 M...
GEOCHEMISTRY AND TECTONIC SIGNIFICANCE OF AUGEN GNEISSES FROM THE SOUTHERN MENDERES MASSIF (WEST TURKEY) Bozkurt, Erdin; PARK, RG (1995-05-01) The protoliths of mylonitized augen gneisses exposed in the southern sector of the Menderes Massif (West Turkey) are calc-alkaline, peraluminous, S-type, late- to post-tectonic tourmaline- and garnet-bearing, two-mica leucogranites. They cut and post-date the fabrics of the 'main Menderes metamorphism' which took place between the early Eocene and early Oligocene and intrude metamorphic basement rocks comprising the so-called 'Palaeozoic schist envelope' of the massif. They are themselves cut by an extensiv...
Crust and upper mantle dynamics of Turkey inferred from passive seismology: implications of segmented slab geometry Berk, Biryol; Susan, Beck; George, Zandt; Kaymakcı, Nuretdin (2010-10-08) Turkey lies within the Alpine–Himalayan orogenic belt and is shaped by continent-continent collision in the east, slab rollback and back arc extension in the west and westward extrusion of Anatolian plate in between. In this study, passive seismic data are used to analyze the crust and upper mantle structure of the region to test different tectonic models proposed for Turkey and its surrounding. In Eastern Turkey, continent-continent collision resulted in a topographic high, the East Anatolian Plateau which...

Citation Formats

L. M. Warren, S. L. Beck, C. B. Biryol, G. Zandt, A. A. Özacar, and Y. Yang, “Crustal Velocity Structure of Turkey from Ambient Noise Tomography,” San-Francisco, Kostarika, 2009, vol. 90, Accessed: 00, 2021. [Online]. Available: http://abstractsearch.agu.org/meetings/2009/FM/sections/T/sessions/T51C/abstracts/T51C-1538.html.