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    Active surface deformations detected by precise levelling surveys in the Afyon-Aksehir Graben, Western Anatolia, Turkey
    (UNIV ZAGREB , ANDRIJA MOHOROVICIC GEOPHYS INST, 2019) Triyakioglu, Ibrahim; Yigit, Cemal Ozer; Ozkaymak, Caglar; Baybura, Tamer; Yilmaz, Mustafa; Ugur, Mehmet Ali; Yalcin, Mustafa; Poyraz, Fatih; Sozbilir, Hasan; Gulal, Vahap Engin
    In the actively deforming region of western Anatolia, crustal deformation is accommodated by destructive earthquakes and a variety of aseismic events. In this study, we investigated the 2016-2017 aseismic sequence located in the Bolvadin Fault, one of the segments of the Aksehir-Simav Fault System of western Anatolia by analysing surface deformation derived from detailed geological mapping. Our findings suggest that surface deformation in the Bolvadin Fault is accommodated by aseismic episodes. During the field studies in the Bolvadin area, progressive surface deformations, such as surface faults and earth fissures with a length of 800 meters to 3 kilometres and strike of N15 degrees E to N70 degrees E were mapped on a 1/5000 scale. Furthermore. a levelling network was established to calculate the vertical displacements and deformation rate along the surface deformations. Precision level measurements were undertaken in 2016 and 2017. On the routes to the NW of the Bolvadin settlement, a vertical deformation rate of 30 mm/yr was detected in the period of 2016-2017, and a large deformation rate of 40 mm/yr was detected in the same period.
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    Current Tectonic Movements Monitoring in Aksehir-Sultandagi Fault Zone After the February 2002 (Mw: 6.2) Earthquake
    (SPRINGER INTERNATIONAL PUBLISHING AG, 2018) Tiryakioglu, Ibrahim; Baybura, Tamer; Ozkaymak, Caglar; Yilmaz, Mustafa; Ugur, Mehmet Ali; Yigit, Cemal Ozer; Dindar, Ahmet Anil; Poyraz, Fatih; Gulal, Engin; Sozbilir, Hasan; Uysal, Murat; Akpinar, Burak; Kallel, A; Ksibi, M; BenDhia, H; Khelifi, N
    …
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    GPS derived finite source mechanism of the 30 October 2020 Samos earthquake, Mw=6.9, in the Aegean extensional region
    (Tubitak Scientific & Technological Research Council Turkey, 2021) Aktug, Bahadir; Tiryakioglu, Ibrahim; Sozbilir, Hasan; Ozener, Haluk; Ozkaymak, Caglar; Yigit, Cemal Ozer; Solak, Halil Ibrahim
    A submarine area close to the Turkish and Greek border between the cities of Samos-Greece and Seferihisar-Turkey has been shaked on October 30, 2020 by a Mw= 6.9 earthquake. In this study, the finite source mechanism of the Samos earthquake was investigated using geodetic methods and the coseismic behavior of the earthquake was modeled. The observed coseismic displacements at 62 sites were inverted for the fault geometry and the slips. The mainshock did not generate an on-land surface rupture. However, the uniform slip modeling shows a finite source of 43.1 km long and 16 km wide rupture, which slips 1.42 m along a north dipping normal fault extending from the Aegean Sea floor to a depth down to similar to 13 km. While the uniform slip model is consistent with the seismological solutions and provides a sufficient fit to the far field coseismic offsets, a distributed slip model is necessary to account for the near field coseismic displacements.