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

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2012-03-01

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

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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

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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...
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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.