Ispir, Duygu ArikanMakineci, Hasan Bilgehan2026-04-102026-04-1020262072-4292https://hdl.handle.net/20.500.13091/13144https://doi.org/10.3390/rs18060858Highlights What are the main findings? Significant LOS displacement is mainly around the Lapseki approach, while the main bridge spans are structurally stable. Annual displacement trends correlate with seasonal environmental factors, showing distinct yearly variations. What are the implications of the main findings? Annual deformation remains within predicted engineering limits, confirming that the bridge's structural health is performing as expected under operational loads. Satellite interferometry is validated as a robust tool for monitoring megastructures, providing high-precision stability assessments without the need for costly in situ measurements.Highlights What are the main findings? Significant LOS displacement is mainly around the Lapseki approach, while the main bridge spans are structurally stable. Annual displacement trends correlate with seasonal environmental factors, showing distinct yearly variations. What are the implications of the main findings? Annual deformation remains within predicted engineering limits, confirming that the bridge's structural health is performing as expected under operational loads. Satellite interferometry is validated as a robust tool for monitoring megastructures, providing high-precision stability assessments without the need for costly in situ measurements.Abstract This study applied SBAS-InSAR to a dense Sentinel-1 Single Look Complex (SLC) archive (146 scenes) to monitor the 1915Çanakkale Bridge between 2022 and 2024 (data up to 7 January 2025 were available and considered in the time-series reconstruction). The analysis produced LOS mean velocity maps and pointwise displacement time series, revealing localized displacement concentrated near the Lapseki approach. Extreme LOS values reached approximately -101 mm (min) and +77 mm (max) across the domain, while maximum cumulative LOS displacement near the Asian anchorage approached -90 mm. These satellite observations suggest that ground-related processes may contribute to the detected observed movement; however, LOS-only measurements and limited in situ validations preclude a definitive separation between structural and geotechnical drivers. We therefore recommend targeted GNSS/levelling campaigns, ascending (ASC)-descending (DSC) InSAR fusion, and formal uncertainty reporting to better constrain the deformation sources and magnitude. The study concluded that the SBAS-InSAR method is effective for long-term, contactless monitoring of bridges and similar mega structures. It was also determined that this method can be used to identify critical areas requiring ongoing monitoring.eninfo:eu-repo/semantics/openAccessLOS DisplacementSBASStructure Health MonitoringInterferometryArticle10.3390/rs18060858