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Source parameters for the Mw = 6.6, 03 February 2002, Çay Earthquake (Turkey) and aftershocks from GPS, Southwestern Turkey

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Abstract

The 03 February 2002 Çay Earthquake (Mw ∼6.7) occurred on the fault segment between Eber and Akşehir Lakes followed by a large aftershock (Mw ∼5.6) near the western end of the fault and two sequential aftershocks. We computed the coseismic surface displacements from static GPS measurements to determine the fault geometry parameters and uniform slip components. The coseismic displacements were obtained through combining the regional pre-earthquake and post-earthquake GPS data. Fault geometry and slips were acquired through the inversion of GPS data modeling the events as elastic dislocations in a half-space and assuming all four events took place on the same fault plane. Results suggest that one-segment fault of ∼33 km length and dipping ∼43° northward suffices to model the dislocation, assuming uniform slip distribution with 0.51 m dip slip, 0.26 m left-lateral slip extending to a depth down to ∼11.5 km which is consistent with seismological evidence. The results also verify the normal faulting in the eastern flank of Isparta Angle which has long been assumed as a thrusting structure. While the available data cannot identify the four individual events on the same day, an attempted distributed slip model differentiates dip slip and left-lateral slips near the hypocenter with maximum values of ∼1 and 0.6 m, respectively.

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Authors and Affiliations

  1. Geodesy Department, General Command of Mapping, Ankara, Turkey

    Bahadır Aktuğ

  2. Department of Geophysical Engineering, Ankara University, Ankara, Turkey

    Bülent Kaypak

  3. Department of Geodesy and Photogrammetry, İstanbul Technical University, İstanbul, Turkey

    Rahmi Nurhan Çelik

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  1. Bahadır Aktuğ
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  2. Bülent Kaypak
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  3. Rahmi Nurhan Çelik
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Correspondence to Bahadır Aktuğ.

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The manuscript solely reflects the personal views of the authors and does not necessarily represent the views, positions, strategies, or opinions of the Turkish Armed Forces.

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Aktuğ, B., Kaypak, B. & Çelik, R.N. Source parameters for the Mw = 6.6, 03 February 2002, Çay Earthquake (Turkey) and aftershocks from GPS, Southwestern Turkey. J Seismol 14, 445–456 (2010). https://doi.org/10.1007/s10950-009-9174-y

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