[Island Chris]

I emailed Professor Hulya Kurt at Istanbul Technical University; she felt it, and also sent the focal mechanism. Below is my email back to her and the others:

Interesting, is a normal-slip quake, in an area where there is longer term contraction. But, the nodal planes both strike NW-SE, and that is the orientation of normal faults in Marmara Sea; NE-SW are thrust faults (or at least components of normal and thrust).

Chris