6 Şubat 2023 Sofalaca-Şehitkamil Gaziantep (Mw:7.7) ve Ekinözü Kahramanmaraş (Mw:7.6) Depremlerinin GNSS Gözlemlerine Bağlı Öncül Sonuçları

Bu çalışmada 6 Şubat 2023 tarihinde sırasıyla yerel saat ile 04:17 ve 13:24’te artarda meydana gelen Sofalaca-Şehitkamil Gaziantep (Mw:7.7) ve Ekinözü Kahramanmaraş (Mw:7.6) depremlerinin öncül jeodezik sonuçları verilmiştir. Öncül jeodezik sonuçları elde etmek için deprem odak merkezleri etrafındaki ve etkili olduğu alandaki TUSAGA-Aktif istasyonlarına ait GNSS alıcılarından 30 sn (0,033 Hz) ve 1 sn’lik (1 Hz) GNSS gözlemleri kullanılmıştır. Deprem kaynaklı kosismik yer değiştirmeleri belirlemek için bağıl statik çözümler GAMIT/GLOBK yazılım takımında 30 sn’lik RINEX verileri kullanılarak yapılmıştır. Statik çözümlerde değerlendirmeye alınan istasyonlarda Sofalaca-Şehitkamil Gaziantep depreminde doğu bileşende atımın 1.1-23.4 cm, kuzey bileşende 1.1-30.9 cm aralığında değiştiği görülmüştür. Ekinözü Kahramanmaraş depreminde ise atım miktarı doğu bileşende 1.2-440.4 cm, kuzey bileşende 1.4-69.6 cm aralığında değişmiştir. Kinematik çözümler ise PPP yöntemiyle CSRS-PPP ve PRIDE PPP-AR yazılımları ile 1 sn’lik RINEX verileri kullanılarak elde edilmiştir. Her iki yazılımda seçilen istasyonlardaki deprem anı yer değiştirmeler (deplasman) ve ardışık epok farkları (hız) hesaplanmıştır. Seçilen tüm istasyonlarda hızlar Sofalaca-Şehitkamil Gaziantep depreminde doğu bileşen için 3-12.5 cm/sn, kuzey bileşen için 3.8 - 37.7 cm/sn aralığında; Ekinözü Kahramanmaraş depreminde ise doğu bileşende 3.7-20.5 cm/sn, kuzey bileşende 4.1-20.1 cm/sn tespit edilmiştir. Öncül sonuçların elde edilmesinden sonra bölgenin daha yakından takibi ve yeni noktalarda atımların tespiti için yeni bir GNSS ağı kurulmuştur. Kurulan yeni ağda TÜBİTAK 1002-C Doğal Afetler Odaklı Saha Çalışması Acil Destek Programı çağrısı kapsamında arazi çalışmalarına başlanmıştır.

Anahtar Kelimeler:

GNSS, PPP-AR, GAMIT/GLOBK, Kosismik deplasman, Sofalaca Gaziantep depremi, Ekinözü Gaziantep depremi

Preliminary Results of the Sofalaca-Şehitkamil Gaziantep (Mw:7.7) and Ekinözü Kahramanmaraş (Mw:7.6) Earthquakes Based on GNSS Observations on February 6, 2023

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.

Keywords:

GNSS, PPP-AR, GAMIT/GLOBK, Coseismic displacement, Sofalaca Gaziantep earthquake, Ekinözü Kahramanmaraş earthquake,

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