Özet:

TUSAGA-Active (Turkish National Fixed GNSS Network-Active) system, with 158 fixed GNSS (Global Navigation Satellite System) stations placed in the Republic of Turkey and KKTC, has been presented for use for commercial and academic studies. On January 24, 2020 a severe earthquake occurred on the Eastern Anadolu Fay Zone (DAFZ) at 20:55 a.m. at Sivrice-Elazığ center, with instrument size MI=6.6 (Mw=6.5) . The earthquake has been felt in the East Anadolu, Southeast Anadolu, Central Anadolu and the Black Sea regions. It is necessary to investigate whether there is any movement in the TUSAGA-Active stations that continuously serve 24 hours in the area of the Sivrice-Elazığ earthquake that occurs in a highly seismically active area. In this scope, the sizes and directions of the movements of the ELAZ, ERGN, MALY and SIV1 TUSAGA-Active stations are determined. The 24 hour data of the days 7 days before and 7 days after the earthquake date was assessed by the Online Positioning User Service (OPUS) and the Australian Online GPS Processing Service (AUSPOS) on the Internet-based data processing services and received daily accurate coordinate data sets. The results of both assessment services are similar or close to each other. The evaluation resulted in the detection of deformations in the ELAZ, ERGN, MALY and SIV1 stations.

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