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

A 3800 yr paleoseismic record (Lake Hazar sediments, eastern Turkey): implications for the East Anatolian Fault seismic cycle
A 3800 yr paleoseismic record (Lake Hazar sediments, eastern Turkey): implications for the East Anatolian Fault seismic cycle
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 (137Cs and 210Pb) dating in an Oxcal model. A mean recurrence interval of ∼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: ∼65% of all turbidites are associated with an EAF source. The seismic cycle of central EAF is thus only partly impacted by creep.
East Anatolian Fault, creep, paleoseismology, seismic shaking, turbidites
0012-821X
1-14
Hubert-ferrari, Aurélia
0595a540-0972-4bf0-aaf5-532610addfb4
Lamair, Laura
1cbee1d2-1021-4dc1-97bf-d8e889ec4440
Hage, Sophie
a914d294-89b9-4686-94f3-e3d7b0c41d76
Schmidt, Sabine
45427e3c-d052-44dd-8231-285479207c1f
Çağatay, M. Namık
f8ff116f-d421-48b7-aa46-003df9f7410b
Avşar, Ulaş
4ffaa957-fef6-4bfd-b25e-f4d8071a5e04
Hubert-ferrari, Aurélia
0595a540-0972-4bf0-aaf5-532610addfb4
Lamair, Laura
1cbee1d2-1021-4dc1-97bf-d8e889ec4440
Hage, Sophie
a914d294-89b9-4686-94f3-e3d7b0c41d76
Schmidt, Sabine
45427e3c-d052-44dd-8231-285479207c1f
Çağatay, M. Namık
f8ff116f-d421-48b7-aa46-003df9f7410b
Avşar, Ulaş
4ffaa957-fef6-4bfd-b25e-f4d8071a5e04

Hubert-ferrari, Aurélia, Lamair, Laura, Hage, Sophie, Schmidt, Sabine, Çağatay, M. Namık and Avşar, Ulaş (2020) A 3800 yr paleoseismic record (Lake Hazar sediments, eastern Turkey): implications for the East Anatolian Fault seismic cycle. Earth and Planetary Science Letters, 538, 1-14, [116152]. (doi:10.1016/j.epsl.2020.116152).

Record type: Article

Abstract

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 (137Cs and 210Pb) dating in an Oxcal model. A mean recurrence interval of ∼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: ∼65% of all turbidites are associated with an EAF source. The seismic cycle of central EAF is thus only partly impacted by creep.

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More information

Accepted/In Press date: 11 February 2020
e-pub ahead of print date: 16 March 2020
Published date: 15 May 2020
Keywords: East Anatolian Fault, creep, paleoseismology, seismic shaking, turbidites

Identifiers

Local EPrints ID: 441887
URI: http://eprints.soton.ac.uk/id/eprint/441887
ISSN: 0012-821X
PURE UUID: d7942d64-6fa0-4c61-ac24-902345b77009

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Date deposited: 01 Jul 2020 16:31
Last modified: 25 Nov 2021 20:33

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Contributors

Author: Aurélia Hubert-ferrari
Author: Laura Lamair
Author: Sophie Hage
Author: Sabine Schmidt
Author: M. Namık Çağatay
Author: Ulaş Avşar

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