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 ∼55 km, a generally normal Moho in Central Anatolia of ∼37-47 km and a thinned Moho in western Anatolia and Cyprus of ∼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.

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S to P conversions were employed to derive a coherent discontinuity structure beneath Indonesia. Analysis of data recorded by three regional arrays from nine deep earthquakes not only confirmed the results of previous studies on the existence of the mid‐mantle discontinuity beneath the Java arc but also revealed its presence north to Kalimantan Island. S to P waves converted at the discontinuity were observed on the stacked diagrams with a negative slowness relative to the P wave and a conversion depth ranging from ∼1080 km in the west to ∼930 km in the east.

[1] Clear S to P converted waves at the 660-km discontinuity (S 660 P) are observed at stacked seismograms of deep earthquakes occurring in northeast China and Japan Sea recorded by broadband seismic arrays in North America and Europe. Differential travel times between the S 660 P and P waves are used to constrain depth variations of the 660 beneath northeast China. A rapid change in the depth of the 660 is observed within a narrow longitudinal range of 130.8°E-131.4°E, where the lower boundary of the subducting slab encounters the 660. Towards the west, the 660 deepens steadily as it approaches the coldest core of the slab. The maximum depression occurs at the west end of the studied region with an amplitude of $20 km. To the east, the 660 appears to be flat, showing no obvious effect of the subducting slab. These observations are consistent with a scenario for a retrograde moving Pacific slab lying over the upper and lower mantle boundary progressively from west to east. Citation: Li, J., Q.-F. Chen, E. Vanacore, and F. Niu (2008), Topography of the 660-km discontinuity beneath northeast China: Implications for a retrograde motion of the subducting Pacific slab, Geophys. Res. Lett., 35, L01302,