Moho structure of the Anatolian Plate from receiver function analysis

Abstract

Here we present first-order results detailing the Anatolian crustal from receiver function analysis of data from approximately 300 stations within Turkey. Seismic data from the Kandilli Observatory array (KOERI; KO), the National Seismic Network of Turkey (AFAD-DAD; TU) and available IRIS data from the Northern Anatolian Fault experiment (YL) for the period between 2005 and 2010 is analysed. We calculate receiver functions in the frequency domain using water-level deconvolution. The results are analysed using a combination of H-K stacking and depth stacking to determine robust Moho conversion depths and V-P/V-S ratios across Anatolia. We detect a deep Moho in eastern Anatolia of up to similar to 55 km, a generally normal Moho in Central Anatolia of similar to 37-47 km and a thinned Moho in western Anatolia and Cyprus of similar to 30 km. The V-P/V-S, ratio across the Anatolian Plate is generally slightly elevated; regions of extremely high V-P/V-S ratio (>1.85) can be associated with recent volcanism in eastern and central Anatolia. High V-P/V-S ratio measurements (>1.85) in western Anatolia may be indicative of partial melt in the lower crust associated with regional extension.