Geodetic modeling reveals complex differential block rotation and slow fault slip rates across the Weihe Basin, indicating partitioned crustal deformation between major tectonic blocks.
SUMMARY This study investigates the complex tectonic interactions and crustal deformation within the Weihe Basin and its surrounding regions, encompassing the northeastern Tibetan Plateau, Ordos Craton, and Qinling Orogenic Belt. By conducting a detailed analysis of Global Navigation Satellite System (GNSS) data and employing a refined tectonic model, we explore relative motion patterns and fault activities in the area. Our findings highlight nuanced movement patterns, with a clockwise rotation observed in the western and central parts of basin, contrasting with an anticlockwise rotation in the eastern part. Secondary block motion decreases from west to east, with the western region showing southeastwards motion and the eastern region exhibiting subtle eastwards deflection. Fault activities within the Weihe Basin generally feature low slip rates, often below 1 mm a−1. Intriguingly, faults in the northern basin predominantly exhibit dextral and extensional movement, while those in the southern region display sinistral and compressive movement. The Weihe fault is identified as a critical boundary between the Ordos block and the Qinling Orogenic Belt. This study offers valuable insights into the tectonic complexities of the Weihe Basin, enhancing our understanding of its kinematic behaviour.
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