TY - JOUR
T1 - The relationship between the tectonic setting of the lake Iznik Basin and the Middle Stand of the North Anatolian Fault
AU - Öztürk, Kurultay
AU - Yaltirak, Cenk
AU - Alpar, Bedri
PY - 2009
Y1 - 2009
N2 - The EIznik Basin is an active depression created by a series of faults developed in relation to the Middle Strand of the North Anatolian Fault (NAFMS). The most important of these faults is the oblique Sölöz fault, which runs parallel to the NAFMS. It is interpreted as a releasing bend, and plays a crucial role in the evolution of the 75-m-deep ellipsoid-shaped depression in the southern part of the lake. The faults that limit the coastal alluvial plain on land, some of which developed during the early evolution of the NAFMS, are equally important in the development of the İznik Basin, and correspond to P-shear or secondary synthetic shear faults. These faults are cut by the main fault zone and are right-laterally displaced by approximately 7-8 km. Considering an annual slip rate of 2 mm on the fault, such a displacement is only possible in a time span of 3.5 to 4 million years. An earthquake periodicity of -2000-2500 years is estimated on the basis of recent GPS data, and a limited number of historical earthquakes. Linear terraces observed on the northern and western parts of the Lake İznik, which have been affected by tectonic activity, show occasional rises of the lake level. The seismic data show that the lake level was approximately 40 m below its present level during the last glacial period.
AB - The EIznik Basin is an active depression created by a series of faults developed in relation to the Middle Strand of the North Anatolian Fault (NAFMS). The most important of these faults is the oblique Sölöz fault, which runs parallel to the NAFMS. It is interpreted as a releasing bend, and plays a crucial role in the evolution of the 75-m-deep ellipsoid-shaped depression in the southern part of the lake. The faults that limit the coastal alluvial plain on land, some of which developed during the early evolution of the NAFMS, are equally important in the development of the İznik Basin, and correspond to P-shear or secondary synthetic shear faults. These faults are cut by the main fault zone and are right-laterally displaced by approximately 7-8 km. Considering an annual slip rate of 2 mm on the fault, such a displacement is only possible in a time span of 3.5 to 4 million years. An earthquake periodicity of -2000-2500 years is estimated on the basis of recent GPS data, and a limited number of historical earthquakes. Linear terraces observed on the northern and western parts of the Lake İznik, which have been affected by tectonic activity, show occasional rises of the lake level. The seismic data show that the lake level was approximately 40 m below its present level during the last glacial period.
KW - High-resolution seismic data
KW - Lake Iznik
KW - North Anatolian Fault
KW - Releasing bend
KW - Tectonics
UR - http://www.scopus.com/inward/record.url?scp=66949173787&partnerID=8YFLogxK
U2 - 10.3906/yer-0803-4
DO - 10.3906/yer-0803-4
M3 - Article
AN - SCOPUS:66949173787
SN - 1300-0985
VL - 18
SP - 209
EP - 224
JO - Turkish Journal of Earth Sciences
JF - Turkish Journal of Earth Sciences
IS - 2
ER -