Özet:

In this study, the earthquakes which took place on 6 February 2023, respectively at local time 04:17 and 13:24 preliminary geodetic results are given that occurred of Sofalaca-Şehitkamil (Gaziantep) (Mw:7.7) and of Ekinözü (Kahramanmaraş) (Mw: 7.6). In order to obtain preliminary geodetic results the GNSS observations were used at 30 s (0.033 Hz) and 1 s (1 Hz) intervals from the GNSS receivers in the network of Continuously Operating Reference Stations, Turkey (CORS-TR). Relative static solutions to determine earthquake-induced coseismic displacements were performed using 30-second RINEX data in the GAMIT/GLOBK software. In the GNSS stations evaluated in the static solutions, it was observed that the coseismic displacement in the Sofalaca-Şehitkamil Gaziantep earthquake varied between 1.1 - 23.4 cm in the eastern component and 1.1 - 30.9 cm and northern component. In the Ekinözü Kahramanmaraş earthquake, the amount of coseismic displacement varied between 1.2 - 440.4 cm in the eastern component and 1.4-69.6 cm in the northern component. Kinematic solutions were obtained by PPP method using CSRS-PPP and PRIDE PPP-AR software and 1 second RINEX data. In both software, earthquake displacements and consecutive epoch differences (velocity) at selected stations were calculated.During the Sofalaca Şehitkamil-Gaziantep earthquake velocities for all selected stations were detected approximately between 3.0-12.5 cm/s for the eastern component and 3.8 - 37.7 cm/sn for the northern component; during the Ekinözü Kahramanmaraş earthquake were detected approximately between 3.7-20.5 cm/sn for the eastern component and 4.1-20.1 cm/sn for the northern component. After the preliminary results were obtained, a new GNSS network was established to observation the region more closely and to detect displacement at new GNSS points. In study area has started new GNSS observations within the scope of TÜBİTAK 1002-C Natural Disasters Focused Field Study Emergency Support Program call in the new network established.