A 3800 yr paleoseismic record (Lake Hazar sediments, eastern Turkey): Implications for the East Anatolian Fault seismic cycle

Date

2020-05-15

Author

Hubert-Ferrari, Aurelia
Lamair, Laura
Hage, Sophie
Schmidt, Sabine
Cagatay, M. Namik
Avşar, Ulaş

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The East Anatolian Fault (EAF) in Turkey is a major active left-lateral strike-slip fault that was seismically active during the 19th century but mostly quiet during the 20th century. Geodetic data suggests that the fault is creeping along its central part. Here we focus on its seismic history as recorded in the sediments of Lake Hazar in the central part of the EAF. Sediment cores were studied using X-ray imagery, magnetic susceptibility, grain-size, loss-on-ignition and X-ray fluorescence measurements. Recurring thin, coarse-grained sediment units identified as turbidites in all cores were deposited synchronously at two deep study sites. The turbidite ages are inferred combining radiocarbon and radionuclide (Cs-137 and Pb-210) dating in an Oxcal model. A mean recurrence interval of similar to 190 yrs is obtained over 3800 yrs. Ages of the recent turbidites correspond to historical earthquakes reported to have occurred along the EAF Zone or to paleoruptures documented in trenches just northeast of Lake Hazar. The turbidites are inferred to be earthquake-triggered. Our record demonstrates that Lake Hazar has been repeatedly subjected to significant seismic shaking over the past 3800 yrs. The seismic sources are variable: similar to 65% of all turbidites are associated with an EAF source. The seismic cycle of central EAF is thus only partly impacted by creep.

Subject Keywords

Earth and Planetary Sciences (miscellaneous), Space and Planetary Science, Geochemistry and Petrology, Geophysics

URI

https://hdl.handle.net/11511/38502

Journal

EARTH AND PLANETARY SCIENCE LETTERS

DOI

https://doi.org/10.1016/j.epsl.2020.116152

Collections

Department of Geological Engineering, Article

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Citation Formats

A. Hubert-Ferrari, L. Lamair, S. Hage, S. Schmidt, M. N. Cagatay, and U. Avşar, “A 3800 yr paleoseismic record (Lake Hazar sediments, eastern Turkey): Implications for the East Anatolian Fault seismic cycle,” EARTH AND PLANETARY SCIENCE LETTERS, pp. 0–0, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38502.