- 1Montpellier University, OREME-CNRS, OSU OREME, Montpellier, France (philippe.vernant@umontpellier.fr)
- 2Geodesy Department, Kandilli Observatory and Earthquake Research Institute (KOERI), Boğaziçi University, İstanbul, Türkiye
- 3Department of Geophysical Engineering, Istanbul University-Cerrahpasa, İstanbul, Türkiye
- 4Geophysics Department, Kandilli Observatory and Earthquake Research Institute (KOERI), Boğaziçi University, İstanbul, Türkiye
- 5Department of Geomatic Engineering, Yildiz Technical University, İstanbul, Türkiye
- 6Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
- 7Department of Geological Engineering, Istanbul Technical University, İstanbul, Türkiye
- 8Institute of Earth and Marine Sciences, Gebze Technical University, Gebze, Kocaeli, Türkiye
- 9The Earth Sciences Research Group, Vice Presidency of Climate Change and Sustainability (VPCCS), Marmara Research Center (MRC), Scientific and Technological Research Council of Türkiye (TÜBİTAK), Gebze, Kocaeli, Türkiye
- 10German Research Centre for Geosciences GFZ, Helmholtz Centre, Potsdam, Germany
- 11Geodesy Department, General Directorate of Mapping, Ankara, Türkiye
Elastic dislocation models have been successfully used to model co-seismic displacements in numerous studies. Expected far-field displacements (>500 km) are low and most of the time beyond uncertainty level of the global navigation satellite system (GNSS) measurements. In the case of the moment magnitude 7.8 and 7.6 Kahramanmaraş earthquakes on 6 February 2023, the Türkiye’s extensive and continuous GNSS network allowed us to show that large earthquakes can induce far-field crustal deformations (>700 kilometers), exceeding current predictions from elastic dislocation models. This and the asymmetry of the co-seismic displacements with respect to the East Anatolian fault provides crucial insights about the deformation of Earth’s crust at various scales and the interactions among tectonic plates. It also carries profound implications for seismic hazard assessments and necessitates a new perspective on crustal deformation and earthquake mechanics.
How to cite: Vernant, P., Ergintav, S., Tan, O., Karabulut, H., Özarpacı, S., Floyd, M., Konca, A. Ö., Çakır, Z., Acarel, D., Çakmak, R., Vasyura-Bathke, H., Dogan, U., Kurt, A. I., Özdemir, A., Ayruk, E. T., Turgut, M., Özel, Ö., and Farımaz, I.: GNSS measurements reveal unexpected far-field deformation of the 2023 Kahramanmaraş earthquakes, Türkiye , EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-6153, https://doi.org/10.5194/egusphere-egu25-6153, 2025.
