Source parameters for the Mw=6.6, 03 February 2002, Cay Earthquake (Turkey) and aftershocks from GPS, Southwestern Turkey

The 03 February 2002 Cay Earthquake (M-w similar to 6.7) occurred on the fault segment between Eber and AkAYehir Lakes followed by a large aftershock (M-w similar to 5.6) near the western end of the fault and two sequential aftershocks. We computed the coseismic surface displacements from static GPS measurements to determine the fault geometry parameters and uniform slip components. The coseismic displacements were obtained through combining the regional pre-earthquake and post-earthquake GPS data. Fault geometry and slips were acquired through the inversion of GPS data modeling the events as elastic dislocations in a half-space and assuming all four events took place on the same fault plane. Results suggest that one-segment fault of similar to 33 km length and dipping similar to 43A degrees northward suffices to model the dislocation, assuming uniform slip distribution with 0.51 m dip slip, 0.26 m left-lateral slip extending to a depth down to similar to 11.5 km which is consistent with seismological evidence. The results also verify the normal faulting in the eastern flank of Isparta Angle which has long been assumed as a thrusting structure. While the available data cannot identify the four individual events on the same day, an attempted distributed slip model differentiates dip slip and left-lateral slips near the hypocenter with maximum values of similar to 1 and 0.6 m, respectively.