Articles by Akın KÜRÇER

The Yenice-Gönen Fault (YGF) is located in the central part of the Biga Peninsula between Gönen and Yenice and is a right-lateral strike-slip active fault with general trending N65°E. On 18 March 1953 there was an earthquake on the YGF that died 263 people (Ms=7.2) and a 70 km surface rupture developed during this earthquake. In this study measurements of slip distribution were performed on the surface rupture of the Yenice-Gönen Earthquake (YGE) and the annual slip rate on the YGF was calculated. Right-lateral displacements of between 1.70±0.1 and 3.20±0.2 metres were measured on the surface rupture of the YGE. The maximum displacements were in an area close to the central part of the YGF (between Çakır and Karaköy village) and these values decreased relatively in NE and SW directions, documenting that was the bilaterally surface rupture propogation during the YGE. In the last 300.000 years, a total offset of 800±50 metres was measured on Gönen River and annual slip rate of 2.65±0.15 mm was calculated along the YGF. Current GPS studies show right-lateral strike-slip faults in the South Marmara region have slip rates of 6-8 mm/year. This slip rate is assessed as being partitioned between the YGF, Sarıköy Fault and Çan-Biga Fault zones which represent extensions of the North Anatolian Fault system within the South Marmara region. Paleoseismology studies determined that in the last 6200 years 6 earthquakes resulting in surface ruptures have occurred on the YGF, including the 1953 earthquake. According to the 14C and OSL dating results, the variable and irregular earthquake recurrence interval of YGF is ranging from 505 to 1793 years. In this study average earthquake recurrence interval of YGF was determined as 1180 years. https://doi.org/10.19111/bulletinofmre.500553

The Tuz Gölü Fault Zone (TGFZ) is one of the most important active intra-continental fault zones in central Anatolia. The TGFZ with nearly 200 km in length and 2-25 km in width is a NW trending, active normal fault zone with minor right-lateral strike-slip component. It extends between the north of Lake Tuz at NW and at Kemerhisar (Ni¤de) SE. This zone is a transition zone that separates the Central Anatolian Neotectonic Region into two-sub neotectonic regions, namely Kayseri-Sivas and Konya-Eskiflehir neotectonic regions. In this study, Neotectonicperiod characteristics, seismicity, geometry and segmentation of TGFZ are investigated. TGFZ is composed of a total of eleven parallel or sub-parallel geometric fault segments with length ranging from 9 to 30 km. In calculations based on empirical equations proposed for normal faults, TGFZ segments are found to generate earthquakes with maximum magnitudes of M=6.11-6.80 and during these earthquakes vertical displacements will be 0.34-1.41 m at maximum with average of 0.25-0.68 m. Fault kinematic analysis studies conducted on TGFZ showed that a NE-SW trending extensional tectonic regime is effective in the region. According to structural observations, stratigraphic relations and age data, neotectonic period for TGFZ started early Pliocene. TGFZ is a structure of NE-SW trending extensional tectonic regime that was activated by the early Pliocene. This structure borders the recent Tuz Gölü Plio-Quaternary basin to the east. By the early Pliocene, total normal slip is found 200-268 m. Based on geologic age and slip amount, average annual slip-rate on TGFZ is 0.046 mm.