Rupture transfer into a sediment-filled strike-slip basin: pre-seismic InSAR and surface-deformation evidence from the Amik Basin, Türkiye
Tectonophysics, cilt.937, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 937
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.tecto.2026.231358
- Dergi Adı: Tectonophysics
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Artic & Antarctic Regions, Compendex, Geobase, INSPEC, Academic Search Ultimate (EBSCO), Engineering Source (EBSCO)
- Anahtar Kelimeler: Amik Basin, Distributed deformation, East Anatolian Fault Zone, Kahramanmaraş earthquake, PS-InSAR, Rupture transfer, Strike-slip basin
- Dokuz Eylül Üniversitesi Adresli: Evet
Özet
Strike-slip ruptures entering thick sediment-filled basins may lose a simple, localized surface expression as displacement is transferred into distributed deformation, inherited basin-margin structures, vertical subsidence, and shallow ground-failure processes. This study investigates this problem at the southern termination of the 6 February 2023 Kahramanmaraş rupture in the Amik Basin, Türkiye, by integrating pre-seismic Sentinel-1 PS-InSAR time series, two-component LOS decomposition, orthophoto-based crack morphometry, Sentinel-2 screened moisture anomalies, and post-earthquake field observations. The 2015–2023 PS-InSAR results reveal spatially localized pre-seismic LOS-velocity domains around the Antakya Fault Zone–Güzelburç sector and along the western Amik Basin margin, including the Hatay Airport sector. Two-component decomposition indicates that vertical subsidence is the dominant first-order component around the airport, whereas the east–west component is used only as an indicator of relative east–west velocity variation because north–south motion remains unresolved. Multi-temporal optical imagery shows that the Hatay Airport crack network coincides with surface discontinuities that were already present before the 2023 earthquake sequence. Crack morphometry further indicates that the Amik Basin traces have lower endpoint connectivity and a more irregular organization than the more continuous rupture sections farther north, consistent with distributed deformation rather than a single hard-linked surface rupture. Field observations of sand boils and lateral spreading, together with screened moisture anomalies, indicate a shallow ground-failure overprint but do not uniquely define the origin of individual cracks. The results are most consistent with a basin-modulated rupture-transfer model in which deeper rupture termination, weak alluvial–lacustrine basin fill, inherited basin-margin deformation, pre-existing subsidence, and coseismically triggered shallow failure jointly influenced the observed surface deformation.