3-D crustal structure along the North Anatolian Fault Zone in north-central Anatolia revealed by local earthquake tomography

Download

index.pdf

Date

2012-03-01

Author

Yolsal Çevikbilen, Seda
Biryol, C. Berk
Beck, Susan
Zandt, George
Taymaz, Tuncay
Adiyaman, Hande E.
Özacar, Atilla Arda

Metadata

Show full item record

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

Item Usage Stats

132
views

98
downloads

3-D P-wave velocity structure and Vp/Vs variations in the crust along the North Anatolian Fault Zone (NAFZ) in north-central Anatolia were investigated by the inversion of local P- and S-wave traveltimes, to gain a better understanding of the seismological characteristics of the region. The 3-D local earthquake tomography inversions included 5444 P- and 3200 S-wave readings obtained from 168 well-located earthquakes between 2006 January and 2008 May. Dense ray coverage yields good resolution, particularly in the central part of the study area. The 3-D Vp and Vp/Vs tomographic images reveal clear correlations with both the surface geology and significant tectonic units in the region. We observed the lower limit of the seismogenic zone for north-central Anatolia at 15 km depth. Final earthquake locations display a distributed pattern throughout the study area, with most of the earthquakes occurring on the major splays of the NAFZ, rather than its master strand. We identify three major high-velocity blocks in the mid-crust separated by the Izmir-Ankara-Erzincan Suture and interpret these blocks to be continental basement fragments that were accreted onto the margin following the closure of Neo-Tethyan Ocean. These basement blocks may have in part influenced the rupture propagations of the historical 1939, 1942 and 1943 earthquakes. In addition, large variations in the Vp/Vs ratio in the mid-crust were observed and have been correlated with the varying fluid contents of the existing lithologies and related tectonic structures.

Subject Keywords

Seismicity and tectonics, Body waves, Seismic tomography, Continental tectonics, Strike-slip and transform, Crustal structure

URI

https://hdl.handle.net/11511/38088

Journal

GEOPHYSICAL JOURNAL INTERNATIONAL

DOI

https://doi.org/10.1111/j.1365-246x.2011.05313.x

Collections

Department of Geological Engineering, Article

Suggestions

OpenMETU
Core

3-D Crustal Structure along the North Anatolian Fault Zone in North Central Anatolia from local earthquake tomography Yolsal-Çevikbilen, Seda ; Biryol, C. Berk; Beck, Susan L.; Zandt, George; Taymaz, Tuncay ; Adiyaman, Hande E.; Özacar, Atilla Arda (2011-04-03) The North Anatolian Fault is a seismically active dextral strike-slip fault zone extending for about 1500 km from Karliova in eastern Turkey to the Gulf of Saros in the Aegean Sea. Three-dimensional P-wave velocity structure and Vp/Vs variation in the crust along the North Anatolian Fault Zone in north central Anatolia was investigated by the inversion of local P- and S-wave travel times in order to gain a better understanding of the seismological characteristics of the region. We used the damped least-squa...
Segmented African lithosphere beneath the Anatolian region inferred from teleseismic P-wave tomography Biryol, C. Berk; Beck, Susan L.; Zandt, George; Özacar, Atilla Arda (2011-03-01) P>Lithospheric deformation throughout Anatolia, a part of the Alpine-Himalayan orogenic belt, is controlled mainly by collision-related tectonic escape of the Anatolian Plate and subduction roll-back along the Aegean Subduction Zone. We study the deeper lithosphere and mantle structure of Anatolia using teleseismic, finite-frequency, P-wave traveltime tomography. We use data from several temporary and permanent seismic networks deployed in the region. Approximately 34 000 P-wave relative traveltime residual...
A new set of overprinting slip-data along Manisa Fault in Aegean Extensional Province, Western Anatolia Tekin, Taner; Sançar, Taylan; Rojay, Fuat Bora (2022-05-23) Interplay between the dynamic effects of the northward subduction of the African plate beneath the Aegean continental fragment and the North Anatolian dextral strike slip fault to the north caused a complex large-scale extensional crustal deformational domain, named Aegean extensional province.The Gediz-Alaşehir Graben (GAG), being in that large scale extensional terrain, is a NW-SE trending extensional basin developed to the north of K. Menderes Graben (KMG). NW-SE trending Manisa fault is one of the impor...
3-D basin geometry model to determine the site effects based on geophysical and geotechnical data: Case study at near-field and high seismicity area of Gölyaka, Düzce, Turkey. Yousefibavil, Karim; Koçkar, Mustafa Kerem; Akgün, Haluk (2018-04-13) The near-field and high seismicity of the area makes the determination of the bedrock geometry more complex and pioneers the studies of site response analysis in account for a seismic hazard assessment. Without a good model of basin structure, any powerful calculation method would lack a well-developed basin response. The study has been conducted in the Gölyaka basin that uniquely falls within the bifurcated near-field section of the North Anatolian Fault System. The surface rupture of the 1999 Earthquakes ...
Late Cretaceous extension and Palaeogene rotation-related contraction in Central Anatolia recorded in the Ayhan-Buyukkisla basin Advokaat, Eldert L.; van Hinsbergen, Douwe J. J.; Kaymakcı, Nuretdin; Vissers, Reinoud L. M.; Hendriks, Bart W. H. (2014-11-18) The configuration and evolution of subduction zones in the Eastern Mediterranean region in Cretaceous time accommodating Africa-Europe convergence remain poorly quantitatively reconstructed, owing to a lack of kinematic constraints. A recent palaeomagnetic study suggested that the triangular Central Anatolian Crystalline Complex (CACC) consists of three blocks that once formed an similar to N-S elongated continental body, underthrusted below ophiolites in Late Cretaceous time. After extensional exhumation a...

Citation Formats

S. Yolsal Çevikbilen et al., “3-D crustal structure along the North Anatolian Fault Zone in north-central Anatolia revealed by local earthquake tomography,” GEOPHYSICAL JOURNAL INTERNATIONAL, pp. 819–849, 2012, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38088.