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[1] We report on seismic and petrological data that provide new constraints on the geological evolution of the Amerasia Basin. A seismic reflection transect across the Makarov Basin, located between the Mendeleev and Lomonosov Ridges, shows a complete undisturbed sedimentary section of Mesozoic/Cenozoic age. In contrast to the Mendeleev Ridge, the margin of the Lomonosov Ridge is wide and shows horst and graben structures. We suggest that the Mendeleev Ridge is most likely volcanic in origin and support this finding with a 40 Ar/ 39 Ar isotopic age for a tholeiitic basalt sampled from the central Alpha/Mendeleev Ridge. Seismic reflection data for the Makarov Basin show no evidence of compressional features, consistent with the Lomonosov Ridge moving as a microplate in the Cenozoic. We propose that the Amerasia Basin moved as a single tectonic plate during the opening of the Eurasia Basin.

11The North Anatolian Fault Zone (NAFZ) in NW Turkey as one of the most active and best studied 12 strike-slip faults provides an unique opportunity to study earthquake related relaxation processes 13 through analyzing co-and postseismic deformation. We study the spatial and temporal 14 distribution of seismicity related to the two consecutive 1999 M>7 Izmit and Düzce earthquakes. 15A high-resolution aftershock catalogue including ~10,000 hypocenters extending along the 16 combined rupture zone and extending from prior to the Izmit event to after the Düzce event is

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