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    Coseismic deformations from the Kahramanmaras earthquake sequence in Erzurum and seismic parameter analysis
    (Geomatik Journal, 2025) Solak, Halil Ibrahim; Gezgin, Cemil; Kılınç, Ahmet Sami; Tiryakioğlu, İbrahim; Baybura, Tamer; Aladoğan, Kayhan; Çakanşimşek, Ece Bengünaz
    In this study, a 17-station GNSS network established under project 22.FENBIL.30 was utilized to calculate the coseismic displacements in and around Erzurum, located along the Northeast Anatolian Fault Zone, following the 2023 Kahramanmarasearthquakes (Mw 7.7 Pazarc & imath;k and Mw 7.6 Ekinozu). The coordinates derived from GNSS measurements conducted in 2022 and 2023 were transformed to the earthquake epoch using interseismic and postseismic velocities from regional CORS-TR stations and TNFGN points. The results indicate that coseismic displacements due to the Kahramanmaras earthquakes in the vicinity of Erzurum range from 2.5 mm to 30 mm, with movement directed toward the southwest. These findings align with the rupture characteristics of the destructive left lateral strike-slip faults responsible for the earthquakes, as well as with the epicentral locations, focal mechanism solutions, and largescale studies in the literature. Additionally, to assess the current seismic hazard in Erzurum and its surroundings, the a and b parameters were calculated using the KRDAE earthquake catalog covering the period from 1900 to 2024. The study area was divided into three subregions, revealing varying levels of seismic activity and stress accumulation across different fault segments. The a parameter indicates high seismic activity in the northwestern part of Erzurum (a = 5.29) and moderate activity in the other regions. The b parameter suggests that small earthquakes occur more frequently west of Erzurum (b = 0.90), while larger earthquakes are more likely in the eastern section (b = 0.69), and a more balanced seismic hazard profile is observed in the southern part (b = 0.76). The results are consistent with the seismic activity of the region, demonstrating that the heterogeneous tectonic structures present a significant potential for large earthquakes. These findings provide a crucial foundation for future seismic hazard assessments in the region.
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    Tectonic activity inferred from velocity field of GNSS measurements in Southwest of Turkey
    (Springer, 2013) Gülal, Engi?n; Tiryakio?lu, İbrahim; Erdo?an, Saffet; Aykut, Nedi?m Onur; Baybura, Tamer; Akpınar, Burak; Telli, Ali Kazim; Erdoğan, Hediye
    Turkey occupies a critical segment in the Alpine-Himalayan orogenic belt that is characterized by many active fault lines. Numerous earthquakes of varying magnitudes have occurred on these fault lines over the years. A significant portion of these earthquakes have been recorded along the Fethiye Burdur Fault Zone (FBFZ). Unfortunately, the latest earthquakes that happened on the FBFZ led to a large loss of human life and extensive economic losses. Southwest Anatolia, including the FBFZ, is monitored by 44 Global Navigation Satellite System (GNSS) stations, comprised of 16 permanent and 28 campaign stations. Measurements have been conducted by combining observations from 2003 to 2006 (Erdogan et al. in J. Earthq. Eng. 12(2):109-118, 2008) with new observations from 2009 and 2010. The combined processes have yielded an updated velocity field of the region. In addition, the effects of the post 2007 earthquakes on the GNSS stations were also investigated. The strain analysis based on the observations made between 2003 and 2010 display high consistency with the earthquakes that occurred in the region. Also, it was observed that the strain analysis is in accordance with the North-South opening created as a result of the African plate being submerged under the Anatolian plate in the southern of the island of Crete.