The June 6 2000 Orta Çankırı Turkey Earthquake Sourced from a New Antithetic Sinistral Strike slip Structure of the North Anatolian Fault System the Dodurga Fault Zone

Date

2001-08-01

Author

Koçyiğit, Ali
Rojay, Fuat Bora
Cihan, Mustafa
Özacar, Atilla Arda

Metadata

Show full item record

Item Usage Stats

165
views

0
downloads

he İsmetpaşa-Kargı section of the North Anatolian Fault System (NAFS) consists of six subfault zones, namely the Eskipazar, the Ulusu, the Tosya, the Çerkeş-Kurşunlu, the Devrez and the newly detected Dodurga fault zone (DFZ). Together these fault zones form a well-developed dextral strike-slip-faulting pattern, in which the DFZ is an antithetic secondary strike-slip component, indicated by focal-mechanism solutions of moderate and large earthquakes that have occurred in the İsmetpaşa-Kargı section of the NAFS. The DFZ is a ~36-km-long, ~N-S-trending strike-slip structure located in the area between Saçak village in the north and Kösrelik village in the south. Pre-Upper Pliocene rocks are cut and tectonically offset for a distance of about 6 km. Upstream tributaries of the Devrez River are deviated in the shape of an \"S\" and are offset sinistrally up to 2.5 km. These values explain a 2.3 mm/yr rate of slip on the DFZ. In addition, several Plio-Quaternary pull-apart basins occur within the DFZ. An intermediate-magnitude (Mw= 6.0), shallow-focus earthquake, the Orta earthquake, struck on Tuesday, June 6, 2000, at 5:42 (local time) in the Orta area, and resulted in two deaths and severe damage to a total of 4842 structures, almost all of rural-style construction. Most of severe damage was confined to a narrow area along the Dodurga fault; that is, the master strand of the DFZ. Isoseismal lines display an ellipsoidal pattern with a long axis that parallels the Dodurga fault. Both fore- and after-shocks of the June 6, 2000 Orta earthquake form a highly concentrated, N-S-trending distribution pattern that parallels the DFZ. Focal-mechanism solutions of the main shock carried out by various seismographic stations, except for DER-DDR station, indicate sinistral strike-slip faulting with a normal-slip component. Consequently, taken together these field observations and seismological data indicate that the Dodurga fault is an antithetic sinistral strike-slip structure included in the NAFS, and that the June 6, 2000 Orta earthquake resulted from its activation.

Subject Keywords

North Anatolian Fault System, Antithetic Fault, Sinistral Strike-slip Fault, Orta Earthquake

URI

https://dergipark.org.tr/tr/pub/tbtkearth/issue/12029/143809
https://hdl.handle.net/11511/79840

Journal

Turkish Journal of Earth Sciences

Collections

Department of Geological Engineering, Article

Suggestions

OpenMETU
Core

The Palu-Uluova Strike-Slip Basin in the East Anatolian Fault System, Turkey: Its Transition from the Palaeotectonic to Neotectonic Stage Colak, Serap; AKSOY, ERCAN; Kocyigit, Ali; İNCEÖZ, MURAT (2012-07-01) The East Anatolian fault system (EAFS) is the 80-km-wide, 700-km-long, NE-trending sinistral strike-slip fault system forming a seismically very active intracontinental transfom fault boundary. It is located between Karhova County in the northeast and Karatas-Samandag counties in the southwest, and forms the southeastern boundary of the Anatolian platelet. The Palu-Uluova basin is one of several strike-slip basins located along the EAFS. It is surrounded by several push-ups such as the Karaomerdagi, Mastard...
Kinematics of Surgu Fault Zone (Malatya, Turkey): A remote sensing study Koc, Ayten; Kaymakcı, Nuretdin (2013-04-01) The Surgu Fault Zone (SFZ) is located in SE Anatolia extending from Goksun in the west to Celikhan in the east, where it bifurcates from the East Anatolian Fault Zone. A detailed analysis along the fault using satellite images, digital elevation models (DEMs) and aerial photographs revealed that the SFZ displays characteristic deformation patterns common to dextral strike-slip faults, including pressure ridges, displaced linear valleys, and deflected stream courses. In addition to this, fault slip data coll...
Displacements and Kinematics of the February 1, 1944 Gerede Earthquake (North Anatolian Fault System, Turkey): Geodetic and Geological Constraints Ayhan, Mehmet Emin; Kocyigit, Ali (2010-01-01) The North Anatolian Fault System (NAFS) is an approximately 2-110-km-wide, 1600-km-long right-lateral intra-continental transform fault boundary between the Anatolian platelet and the Eurasian plate. The Gerede fault zone is one of the major active structures in the western section of the NAFS. It is a 1-9-km-wide, 325-km-long and ENE-trending dextral strike-slip fault zone, with a total accumulated offset since its initiation (Late Pliocene) of about 43 km. This offset indicates an average geological slip ...
Post-paleogene deformation in northernmost tip of Tuzgolu fault zone (Pasadag, South of Ankara), Turkey Çeliker, G. Dilara; Rojay, Fuat Bora; Department of Geological Engineering (2009) The research area is located to the northern tip of Tuzgolu fault zone in the junction of neotectonic structures, namely, Eskişehir-Cihanbeyli, Sungurlu-Kırıkkale and Tuzgölü fault zones (Central Anatolia). The study is carried out in Paleocene sequences of Paşadağ group on the structural analysis of bed, gash vein, fault and fault plane slippage data. The method of study based on i) the rose and stereo analysis of the planar structure (beds, gash veins and faults) on ROCKWORKS 2009 software and ii) on faul...
An Active Composite Pull-apart Basin Within the Central Part of the North Anatolian Fault System: the Merzifon-Suluova Basin, Turkey Rojay, Fuat Bora (2012-07-01) The North Anatolian Fault System (NAPS) that separates the Eurasian plate in the north from the Anatolian microplate in the south is an intracontinental transform plate boundary. Its course makes a northward convex arch-shaped pattern by flexure in its central part between Ladik in the east and Kargi in the west. A number of strike-slip basins of dissimilar type and age occur within the NAFS. One of the spatially large basins is the E-W-trending Merzifon-Suluoya basin (MS basin), about 53 km long and 22 km ...

Citation Formats

A. Koçyiğit, F. B. Rojay, M. Cihan, and A. A. Özacar, “The June 6 2000 Orta Çankırı Turkey Earthquake Sourced from a New Antithetic Sinistral Strike slip Structure of the North Anatolian Fault System the Dodurga Fault Zone,” Turkish Journal of Earth Sciences, pp. 69–82, 2001, Accessed: 00, 2021. [Online]. Available: https://dergipark.org.tr/tr/pub/tbtkearth/issue/12029/143809.