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|Authors: ||Pucci, S.*|
De Martini, P. M.*
|Title: ||Slip rate of the Düzce segment of the North Anatolian Fault Zone from offset geomorphic markers|
|Issue Date: ||7-Aug-2006|
|Keywords: ||tectonic geomorphology,|
1999 Düzce earthquake
|Abstract: ||We provide new estimates on the Quaternary slip rate of the active transform margin of North Anatolia.
We investigated the area struck by 12 November 1999, Mw 7.1 earthquake, that ruptured the Düzce fault segment. In order to analyze the spectacular tectonically driven cumulative landforms and the drainage pattern settings, we carried out a 1:25 000-scale geological and geomorphological map along the fault trace. We reconstruct and describe, as offset geomorphic markers, right-hand stream deflections and remnant of an old alluvial fan modeled by fluvial terraces. The streams are deflected for a total of about 100 m and the onset of the offset was radiocarbon dated about 7000 yr BP. The two documented and correlated Late Pleistocene, terrace risers are offset of about 300 and 890 m, respectively. These terrace risers were dated by means of Optically Stimulated Luminescence (OSL) method about 21 000 yr BP and 60 000 yr BP. These ages and offsets translate to a constant rate of deformation of the Düzce Fault, at different time scales, of 14.0 ± 1.8 mm/yr and disproves a time-variable model at least for the last 60 000 yr.
Considering the GPS-measured strain accumulation due to the plate motion along this part of the North Anatolian Fault Zone, the Düzce Fault importantly participates to the North Anatolian margin deformation, suggesting a present-day partitioning of displacement rates with the Mudurnu fault to the south and assuming a relevant role in the seismic hazard of the area.|
|Appears in Collections:||Manuscripts|
04.06.01. Earthquake faults: properties and evolution
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