Incorporating Persistent Scatterer Interferometry and Radon Anomaly to Understand the Anar Fault Mechanism and Observing New Evidence of Intensified Activity

Interferometric Synthetic Aperture Radar (InSAR) monitors surface change and displacement over a large area with millimeter-level precision meter-level resolution. Anar fault, length of ~200 km, is located in central Iran. Recent seismological studies on the fault indicated that it approaching end its seismic cycle. Although earthquake imminent, mechanism not well understood. Therefore, understanding discovering remains challenge. Here, we present an approach analysis utilizing combination InSAR data obtained from persistent scatterer interferometry (PSI) method 178 Sentinel-1 images (ascending descending) (2017–2020). We incorporated groundwater samples 40 wells, radon concentration anomaly mapping, Global Positioning System (GPS), 3D measurement acquired four years (2016–2020). investigated monitored deformation plate’s behavior last three (2017–2020) to explore new evidence signature displacement. The results show time series range has increasing rate all dimensions. observed line-of-sight (LOS) varied ?15 mm 5 per year. Our calculations E–W, N–S, vertical rates blocks are 2 ?2 mm, 6 ?6 ?4 year, respectively. An map shows complete alignment high ranges strike increased average 23.85 Bq/L 25.30 these years. predict rising due increase activity which resulted deformation. Finally, our findings oblique right-lateral strike-slip normal component mechanism. validated proposed by comparing GPS field PSI measurements. root mean square error (RMSE) estimated be 0.142 mm. Based supporting signature, conclude between 2017 2020.