Kinematic analysis, seismicity and remote sensing analysis of Uluabat fault

In this study, the kinematic evolution, seismicity and behavior style of Uluabat Fault are studied to be enlightened. This fault is the main active fault segment in south of Marmara Sea on southern branch of the North Anatolian Fault. It extends through the south of the Uluabat Lake with the WSW-ENE trending between Hasanağa (Bursa) and Mustafakemalpaşa (Bursa) as an active and right lateral strike-slip fault starting from Miocene. The inversion of slip vectors measured on fault planes indicates that transtansional stress regime is dominant and having a consistent N40W-trending ? Hmax ( ? 1) and N45E-trending ? Hmin ( ? 3) axes. Also, Rm value is the 0.43. The focal mechanism solution and inversion of the some earthquakes presented a NW-trending ? Hmax ( ? 1) and NE-trending ? Hmin ( ? 3) axes strike-slip stress regime. This result is concordant with fault kinematic analysis. Also we observed reverse and local normal faults in this active transtansional regime. The regional NW-SE directed compressional stress regime has been determined with the lineament analysis on the Palsar image by remote sensing studies. In trench studies, around the Fadıllı Village, two fault systems have been observed. These are the mainly strike-slip and local reverse fault. A negative flower structure has been determined in strike-slip deformation in trench walls. Uluabat Fault has a potential seismic gap both important historical record and instrumental periods. Transtansional tectonic regime of the Uluabat Fault resulted from (1) coeval influence of the forces due to the subduction processes along the Cyprus and Hellenic arc in the south, (2) continental collision Anatolia/Arabian plate in the east, (3) anti-clockwise rotation and (4) westward escape and/or extrusion of the Anatolian Block.