Kinematics of the Mw=7.2, 12 November 1999, Duzce, Turkey earthquake

The November 12, 1999 Duzce earthquake ruptured a similar to 40-km-long fau lt segment of the North Anatolian fault system immediately to the east of t he August 17, 1999 Izmit rupture. We use displacements of 32 sites derived from GPS measurements immediately before and after the Duzce earthquake to estimate the geometry and slip distribution of the coseismic rupture. The s imilar to 51 degrees northward dipping rupture plane, the rake of the slip vector (average 3.76 +/- 0.04 m right-lateral, 0.76 +/- 0.04 m normal slip) , and the slip distribution inferred from the GPS data are consistent with seismic observations and the distribution of surface offsets measured in th e field. The geodetically determined moment magnitude is M-w = 7.2. The Duz ce earthquake had the highest slip-to-rupture-length ratio of any historic earthquake along the North Anatolian fault. This is consistent with the Duz ce earthquake being a part of a composite rupture with the preceding Izmit event.