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Pré-Publication, Document De Travail Année : 2023

Kinematics of the Kahramanmaraş triple junction: evidence of shear partitioning

Résumé

We present an up-to-date velocity field around the north of the eastern Mediterranean, southern Turkey, Cyprus, Levant, and East Anatolian faults therein and discuss its tectonic implications. We perform a block model inversion to calculate rigid block motion, slip rates on the dislocation sources along block boundaries. Our best fitting model locates the Sinai-Anatolia Euler pole at 32.04±1.8° N, 38.21±2.4° E with a 0.596±0.084 clockwise rotation rate. Convergence rate on the Cyprus arc is $\sim$3-6 mm/yr, progressively decreasing from west to east. Kyrenia range has a left lateral slip behavior with a 3-4 mm/yr rate. We thus show that there is shear partitioning between the Cyprus subduction and Kyrenia fault zone. The northeast prolongation of the Kyrenia fault east of the Adana basin accommodates extensional and strike-slip motion, which is consistent with focal mechanisms. Further East, the relative strike-slip motion between Arabia and Anatolia is partitioned between the East Anatolian Fault (slip rates 5-6 mm/yr) and the \c{C}ardak and Malatya faults (slip rates 1.7-1.8 mm/yr), and also causes distributed deformation between these two fault systems. The Levant fault has a 3.2-4.0 mm/yr left-lateral slip rate, decreasing northward. A continuum kinematic model shows a compressional to transpressional strain accumulation across the Cyprus arc that is also compatible with its progressive change of orientation. The largest values for the second invariant of strain rate tensor define a region from Hatay to Malatya corresponding to a 50-60 km wide East Anatolian shear zone. The whole area north of the Kahramanmara{{\c{s}}} triple junction appear to be under E-W extension. Strain rates appear relatively small in the Taurus and vary from extensional to compressional along the mountain range.
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Dates et versions

hal-04053058 , version 1 (31-03-2023)
hal-04053058 , version 2 (13-10-2023)

Identifiants

  • HAL Id : hal-04053058 , version 1

Citer

Volkan Özbey, A. M. Celâl Şengör, Pierre Henry, M. Sinan Özeren, Elliot C. Klein, et al.. Kinematics of the Kahramanmaraş triple junction: evidence of shear partitioning. 2023. ⟨hal-04053058v1⟩
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