Preliminary horizontal co-seismic displacements caused by the 2023 Mw 7.8 and Mw 7.5 Türkiye earthquakes estimated using high-rate GPS observations.

Using high-rate (1 Hz) global positioning system (GPS) data, coseismic displacement estimates are obtained for the 2023 Mw 7.8 Pazarcik and Elbistan Mw 7.5 Türkiye earthquakes. The estimated largest displacements caused by the Mw 7.8 event are observed at station ante with an eastward component displacement of 31cm and at station mly1 with a southward component displacement of 39cm. The displacements caused by the Mw 7.8 Pazarcik event show left-lateral displacements along the nodal plane, which is consistent with the focal mechanism. The largest displacements caused by the Mw 7.5 event are a westward component displacement of 450 cm and a northward component displacement of 97cm at the station ekz1 which is only 6 km from the epicenter of the event. Based on high-rate GPS time series, the surface wave propagation of the Mw 7.8 Elbistan earthquake is preliminarily estimated at an overall speed of approximately 2.9 km/s, with a slightly higher speed of 3.1 km/s along the northeast direction and 3.0 km/s along the east direction. High-rate GPS measurements show a prominent advantage of temporal resolution for earthquake sequences with short intervals, and preliminary displacement estimates could be made with only a few hours of observations. The displacement estimation provides constraints for the inversion of the rupture process and seismic source mechanisms. [ABSTRACT FROM AUTHOR]