Active faults studies in Delhi and national capital region (NCR): Inferences from satellite data and field investigations

In recent years, the National Capital Region (NCR) of Delhi has experienced several earthquakes ranging in magnitude from 1.0 to 6.7. According last 50 years earthquake data, majority NCR have occurred near Mahendragarh Dehradun Fault (MDF) and Sohna (SF). The region is bounded by a number subsurface Ridges, Faults, Lineaments, which are also influenced active plate boundary Indian Eurasian plates. Active fault mapping critical for precise identification marking traces area seismic hazard assessment. We used high resolution Cartosat-1 stereopair data obtained NRSC, Hyderabad, Anaglyph (A 3D representation surface) DEM prepared with ENVI software map faults. identified 12 sites based on satellite interpretation, primarily along MDF their extensions. presence tectono-geomorphic markers Fault, such as warped surfaces indicative scarps, stream offsets, gully erosion, sag ponds, suggests tectonic movement these faults, most likely geological past. believe right-lateral strike-slip compressional component western side an extensional eastern side. It acts segment between boundaries. right lateral Nuh-Jhirka (NJF), can be Fault’s southern extension Nuh Jhirka. limb Mega fold seen few movements that extended up bank Yamuna River, where river reflects base-level change tight meandering its upward straight pattern downward This known (DF). findings preliminary, further research would required create detailed Delhi-NCR conduct Seismic Hazard Assessment (SHA) region.