Source Model of the 2023 Turkey Earthquake Sequence Imaged by Sentinel-1 and GPS Measurements: Implications for Heterogeneous Fault Behavior along the East Anatolian Fault Zone

On 6 February 2023, a devastating doublet of earthquakes with magnitudes Mw 7.8 and 7.6 successively struck southeastern Turkey near the border Syria. The earthquake sequence represents strongest in during past 80 years caused an extensive loss life property. In this study, we processed Sentinel-1 GPS data to derive complete surface displacement by sequence. displacements were adopted invert for fault geometry coseismic slip distribution on seismogenic faults results indicate that rupture was dominated left-lateral strike slips maximum ~10 m East Anatolian Fault Zone (EAFZ) Sürgü (SF). Significant ruptures are recognized based geodetic inversion, which is consistent analysis post-earthquake satellite images. cumulative released moment two reached 9.62 × 1020 Nm, corresponds event 7.95. Additionally, interseismic rates locking depths along central western segments EAFZ estimated using high-resolution long-term velocity field. reveal significant lateral variations EAFZ. Generally, zone showed good spatial consistency shock static coulomb failure stress (CFS) change due suggests subsequent certainly promoted shock. transfers from SF realized unclamping interface SF, significantly reduces effective normal plane. Large CFS increases Puturge segment EAFZ, not ruptured 2020 6.8 2023 earthquakes, highlight future risk segment.