Reference : A 3800 yr paleoseismic record (Lake Hazar sediments, eastern Turkey): Implications fo...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
A 3800 yr paleoseismic record (Lake Hazar sediments, eastern Turkey): Implications for the East Anatolian Fault seismic cycle
Hubert, Aurelia mailto [Université de Liège - ULiège > Département de géographie > Géomorphologie et Géologie du Quaternaire >]
Lamair, Laura mailto [Université de Liège - ULiège > > SPHERES >]
Hage, Sophie [> >]
Schmidt, Sabine [> >]
Cagatay, Namik [> >]
Avsar, Ulas [> >]
Earth and Planetary Science Letters
Yes (verified by ORBi)
[en] East Anatolian Fault ; Paleoseismology ; Creep
[en] 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 years 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 years. 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.
EU - European Union
“Understanding the irregularity of seismic cycles: A case study in Turkey” (MEXT- CT-2005-025617: Seismic Cycles)

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