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Paleoseismological record of the Hazar Lake along the East Anatolian Fault (Turkey)
Date
2015-08-02
Author
Hubert-ferrari, Aurelia
Lamair, Laura
Hage, Sophie
Avşar, Ulaş
El Ouahabi, Meriam
Çağatay, Namık
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The East Anatolian Fault (EAF) is a major left-lateral strike-slip fault accommodating with the conjugate North Anatolian Fault the westward extrusion of the Anatolian Plate away from the Arabia-Eurasia collision zone. The East Anatolian Fault ruptured over most of its length during the 19th century in a series of magnitude ~7 earthquakes. During the 20th century this fault was less active with only two events of magnitude greater than 6. This absence of large earthquakes has resulted in relatively little attention being paid to the East Anatolian Fault compared to the North Anatolian Fault, which has ruptured during the last century in several earthquakes of Ms~7. To constrain the seismic history of the East Anatolian Fault in its central part, we focus on the Hazar Lake, occupying a 20 km long pull-apart basin. Short cores and long sedimentary cores were collected at different sites to retrieve a paleoseismological record. The sedimentary records were analyzed combining X-ray imagery, magnetic susceptibility, grain-size, loss-on-ignition and XRF measurements. The cores were correlated based on variations in magnetic susceptibility and Ca-content attributed to significant lake level changes. In addition small correlative coarse-grained sedimentary events regularly spaced are identified in all cores. These thin turbidites are inferred to be earthquake triggered based on (1) their occurrence at different sites that must be reached by different turbiditic flows; (2) their large-scale global impact on the lake sediments even at sites where no turbiditic deposit occurred. Each event can be composed of several coarsegrained sub-events of different magnitude with a time lapse in between greater than a week. The latter is reveals by the presence of bioturbation in particular by chironomids in individual thin sand layers. The different sub-events may be the expression of a complete earthquake sequence (i.e main-shock, foreshocks and aftershocks) or of an earthquake sequence of large M>6.5 earthquake along the East-Anatolian Fault. The age of the events is inferred combining radiocarbon and radionuclide (137 Cs and 210Pb) dating. The first four events would correspond to historical earthquakes occurring in 1874-75, in 1779-1789, 1513-1514, 1285. The event recurrence time is about 300 years.
URI
https://hdl.handle.net/11511/76196
Conference Name
XIXth International Union for Quaternary Research (INQUA) Congress, (27 July - 02 August 2015)
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Department of Geological Engineering, Conference / Seminar
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A 3000 yr paleoseismological history of the central East Anatolian Fault (Turkey) based on sedimentary record of Hazar Lake
Lamaır, Laura; Hubert-ferrari, Aurelia; Hage, Sophie; Avşar, Ulaş; Schmidt, Sabine; Çağatay, Namık (null; 2017-10-12)
The East Anatolian Fault (EAF) is a major left-lateral strike-slip fault accommodating with the conjugate North Anatolian Fault the westward extrusion of the Anatolian Plate away from the Arabia-Eurasia collision zone. During the 20th century, the EAF activity was mostly quiestcent with only two events of magnitude greater than 6 recorded (1905 Malatya and the 1971 Bingol earthquakes). Historical seismicity suggests that the EAF is capable of generating earthquakes of magnitude greater than 7. In order to r...
Understanding of the diversity of earthquake turbiditic flows in a single lake: the case of the Lake Hazar on the East Anatolian Faul
Lamair, Laura; Hage, Sophie; Hubert-ferrari, Aurelia; Avşar, Ulaş; Garcia Moreno, David; Boulvain, Frederic; Çağatay, Namık (null; 2014-08-18)
The East Anatolian Fault (EAF) is a major left-lateral strike-slip fault accommodating with the conjugate North Anatolian Fault the westward extrusion of the Anatolian Plate away from the Arabia-Eurasia collision zone. The East Anatolian Fault ruptured over most of its length during the 19th century in a series of magnitude ~7 earthquakes. During the 20th century this fault was less active with only two events of magnitude greater than 6. This absence of large earthquakes has resulted in relatively little a...
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A. Hubert-ferrari, L. Lamair, S. Hage, U. Avşar, M. El Ouahabi, and N. Çağatay, “Paleoseismological record of the Hazar Lake along the East Anatolian Fault (Turkey),” presented at the XIXth International Union for Quaternary Research (INQUA) Congress, (27 July - 02 August 2015), 2015, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/76196.