Tectonic evolution of the Indio Hills segment of the San Andreas fault in southern California, southwestern USA

Abstract. Transpressional uplift domains of inverted Pliocene–Pleistocene basin fill along the San Andreas fault zone in Coachella Valley, southern California (USA), are characterized by linkage and segmentation deformation partitioning. The Indio Hills wedge-shaped block is located between two boundary strands, to northeast main southwest, which merge southeast. Uplift commenced about or later than 0.76 million years ago involved progressive fold faulting stages caused a change from distributed strain partly partitioned right-slip reverse/thrust displacement on bounding faults when approaching junction. Major structures study area include oblique, right-stepping, overturned en echelon macro-folds that tighten bend into parallelism with east become more open towards west, indicating an early close relationship late initiation fault. Sets strike-slip reverse step-over right- left-lateral cross conjugate kink bands affect entire uplifted area, locally offset macro-folds. Comparison Mecca Durmid uplifts farther southeast strike Valley reveals notable similarities, but also differences architectures, spatial temporal evolution, mechanisms. present work contributes better understand structure tectonic history major system transform plate boundary.