Morphometric Inversion of Paleo-Geodetic Markers Along the Kachchh Mainland Fault: Harmonizing Fault Kinematics and Seismic Potential in Kachchh, Western India

The 2001 Bhuj earthquake (Mw 7.6) underscored the seismic potential of the slow-deforming Kachchh region, a concern echoed by historical and archeological accounts of earthquakes despite its distance from plate boundaries. Our study investigates such tectonic signals in the Kachchh region by analyzing deformed geomorphic paleo-geodetic markers associated with the Jhura Anticline along the Northern Hill Range of Kachchh Upland and performing a full morphotectonic inversion of the underlying fault. Findings reveal a shallow detaching reverse fault dipping 51 degrees south and characterized by a slip rate of similar to 1.5 mm/yr, horizontal shortening rate of similar to 0.96 mm/yr, and uplift rate of 0.6 mm/yr during the last 30 ka. These findings not only refine the understanding of the Kachchh Mainland Fault's seismotectonic behavior but also suggest a complex fault system that challenges prevailing views on regional seismic sources. Our work emphasizes the need for revised seismic hazard assessment and contributes critical insights into the long-term deformation and seismogenic potential of the Kachchh region.