Figure 2
(A) Regional map with major faults and shadow zone between MSR and DCFZ on SRTM-90 m DEM (https://earthexplorer.usgs.gov/). Fading red: coupling on MHT with solid red being closer to 114. Transparent blue circles are earthquake epicentres below 6, and solid yellow circles with 6–7 magnitude (https://earthquake.usgs.gov). Solid white rectangles: trench sites at Damak7, Panijhora5, Chalsa3 and Piping19, solid yellow rectangle: trench site of the present study at Chenga village. Abbreviations- DCFZ- Dhubri-Chungthang Fault Zone, HFT/MFT- Himalayan Frontal Thrust/Main Frontal Thrust, ITSZ- Indo-Tsangpo Suture Zone, LF- Lohargarh Forest, MBT-Main Boundary Thrust and MCT- Main Central Thrust. (B) The geology of DSH foothills and geomorphic features plotted on SRTM-30m DEM in the foothills are plotted along with the extrapolated HFT in the piedmont zone west of the Gish Fault29,30. (C) Topographic and geomorphic map of the Chalsa scarp on ALOS PALSAR DEM (12.5 m res) https://search.asf.alaska.edu/#/, indicating the location of the main fault trace that truncates the Neora River terrace and the location of trench investigations carried out by Kumar et al.3 and Mishra et al.5 across a smaller, younger fault scarp that splays towards south. The figures were created using Adobe Illustrator software, vCS-5, https://www.adobe.com/in/products/illustrator.
