Investigation of the Effects of Tectonic Movements Occurring in Elazig and Surrounding Provinces on the Positions of TNPGN-Active Stations by Using Static Deformation Models

Abstract

Turkish National Permanent GNSS Network-Active ( TNPGN-Active) Project serves their users with a total of 158 permanent stations, including the Turkish Republic of Northern Cyprus and Turkey. The movements caused by earthquakes can be determined effectively with this GNSS network. It was thought that the earthquakes, occurred on the Eastern Anatolian Fault Zone (DAFZ) on April 04, 2019 (5.2 MW), December 27, 2019 (4.8 MW) and January 24, 2020 (6.5 MW), affected TNPGN-Active stations located in neighbouring provinces close to this fault zone. In this context, a local GNSS network (ADY1, ARPK, BING, DIYB, ELAZ, ERGN, MALY, SIV1 and TNCE) were created from existing TNPGN-Active points and the movements of the stations in the network are periodically examined. theta(2) Criteria and IWST (Iterative Weighted Similarity Transformation), which were geodetic static deformation models, were used to determine movement amounts and directions. As a result of the evaluation, it was determined that both methods gave similar results. The largest movement was determined at the ELAZ station between the periods of January 03, 2019 and January 25, 2020 in the horizontal direction about 5.5 cm (southwest) and in the vertical direction about 3 cm (up). It was also determined that other TNPGN-Active stations were affected by the earthquake of 6.5 MW in particular on January 24, 2020 and there were movements in these stations up to 1-2 cm in horizontal direction.