DANA: Dense Array for Northern Anatolia

David G. Cornwell*1, Sebastian Rost2, David A. Thompson3, Greg Houseman2, George Taylor2,4, Elvira Papaleo1, Selda Altuncu Poyraz5, Metin Kahraman5, Ugur Teoman5, Niyazi Turkelli5, Levent Gulen6, Murat Utkucu6

1School of Geosciences, University of Aberdeen, Aberdeen, UK (d.cornwell@abdn.ac.uk), 2School of Earth and Environment, Institute of Geophysics and Tectonics, University of Leeds, Leeds, UK, 3School of Earth and Ocean Sciences, Cardiff University, Cardiff, UK, 4Institute of Seismology, School of Geosciences and Geography, University of Helsinki, Helsinki, Finland, 5Kandilli Observatory and Earthquake Research Institute, Bogazici Universitesi, Istanbul, Turkey, 6Department of Geophysical Engineering, Sakarya Universitesi, Sakarya, Turkey

We present the deployment details and results from the Dense Array for Northern Anatolia (DANA), designed to collect passive seismological data across the seismically-active North Anatolian Fault in northern Turkey to image fault structure in the lower crust and upper mantle. The North Anatolian Fault Zone (NAFZ) is a major continental strike-slip fault system, similar in size and scale to the San Andreas system, that extends ~1200 km across Turkey. In 2012, a new multidisciplinary project (Faultlab) was initiated to better understand deformation throughout the entire crust in the NAFZ, in particular the expected transition from narrow zones of brittle deformation in the upper crust to broad shear zones in the lower crust/upper mantle and how these features contribute to the earthquake loading cycle. The seismic component of the project, DANA, consisted of a 16-month 73-station network spanning the northern and southern branches of the NAFZ in the Sakarya region. The Dense Array for North Anatolia (DANA) is arranged as a 6 by 11 grid with a nominal station spacing of 7 km, with a further 7 stations located outside of the grid. With the excellent resolution afforded by the DANA network, we were able to locate local seismicity, map crustal discontinuities, constrain lithospheric properties and delineate the northern branch of the NAFZ from surface to upper mantle using receiver functions, transfer functions, ambient noise and teleseismic tomography, scattering tomography, scattering migration and ambient noise autocorrelation.

 

 

 

 

 

 

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