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| Titel |
Reconstructing the paleoseismic history of the Priene-Sazli Fault using 36Cl cosmogenic nuclide dating method, Western Anatolia, Turkey |
| VerfasserIn |
Nasim Mozafari Amiri, Ökmen Sümer, Dmitry Tikhomirov, Caglar Özkaymak, Susan Ivy-Ochs, Bora Uzel, Christof Vockenhuber, Hasan Sözbilir, Naki Akçar |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250089781
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| Publikation (Nr.) |
 EGU/EGU2014-3994.pdf |
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| Zusammenfassung |
| The 300-km wide West Anatolian Extensional Province is one of the regions of intense
seismic activity in the world within the Alpine-Himalayan belt. Deformation pattern in the
area is controlled by three major E-W trending graben systems of Gediz, Küçük Menderes
and Büyük Menderes which have been formed as a result of roughly N-S extensional tectonic
regime since the early Miocene. These graben systems show evidences of surface faulting
during the Pleistocene-Holocene and are geomorphologically characterized by well-exposed
limestone normal fault scarps with a relief of tens of meters and well-preserved
slickenlines.
Since limestones are resistant to weathering, the limestone scarps can efficiently record
several past earthquakes. Cosmogenic 36Cl is the only element to identify and date the
rupture events. Each rupture causes exposure of previously buried section of the scarp to the
surface. Accordingly, due to being well enough exposed to cosmic rays, accumulation of 36Cl
accelerates during period of quiescence. Thus, distribution of measured 36Cl concentrations
can be applied to investigate periods of seismic activity and inactivity and also to
calculate the vertical displacement along the fault plane in association with each
rupture.
In this study, we focus on the Priene-Sazli Fault, located on the most western part of Büyük
Menderes graben. Along the active fault zone, well exposed archaeological sites (e.g.
Priene) have been discovered, where destructive historical earthquakes have left
evidence of ancient damages in the historical period and during the 20th century.
The Priene-Sazli Fault caused the July 16, 1955 Söke-Balat earthquake (M=6.8)
with fault-plane solution indicating of normal southeast downthrow along with
subsidiary dextral motion. We collected 117 samples from four continuous strips on the
Priene-Sazli Fault to measure 36Cl concentrations. We used a new Matlab code to
identify the significant ruptures and their timing. Our preliminary results reveal the
evidence of enhanced seismic activities along the Priene-Sazli Fault during the early
Holocene. |
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