1. Department of Earth Sciences, University of Oregon , Eugene, OR 97403 , USA
2. Institute of Earth Sciences, University of Iceland , 102 Reykjavik , Iceland
3. National Observatory of Athens, Institute of Geodynamics , Lofos Nymfon, Thission, 11810 Athens , Greece
4. Department of Geophysical Engineering, The Faculty of Mines, Istanbul Technical University , Maslak 34467, Sarıyer, Istanbul , Türkiye
5. Department of Earth and Space Sciences, University of Washington , Seattle, WA 98195 , USA
6. School of Earth and Space Sciences, University of Science and Technology of China , Hefei, Anhui 230026 , P.R. China
7. Institute for Geophysics, University of Texas at Austin , Austin, TX 78758 , USA
8. Department of Geophysical Engineering, Kocaeli University , 41001 Izmit, Kocaeli , Türkiye
9. Icelandic Meteorological Office , 105 Reykjavík , Iceland