EGU General Assembly 2021 Abstract EGU 21 11139
EGU General Assembly 2021 Abstract: EGU 21 -11139 | ECS Crustal structure across Himalayan Frontal Thrust (HFT) using high-resolution geophysical datasets Shashank Narayan Verma, Dibakar Ghosal, Vikas, Sudhanshu Pandey, Pratyush Anand, and Harshad Srivastava Indian Institute of Technology Kanpur, 208016, Uttar Pradesh
Study Area q Siwalik group of rocks mainly sandstone, conglomerate, and alluvial deposits . P 1 q Seismic Thumper (energy source) q Geophones 96 (5 Hz) q GI: 20 m q SI: 20 m q Near offset: 100 m q Profile Length: 5. 2 km q End on survey q SRTM DEM (30 m resolution) q RTK for elevation variation
Methodology Reflection Seismic Refraction Seismic q Stacking of three shots for better q Picking of the first arrival travel-time (refracted SNR phases) q Ground Roll removal (LFAF), and q frequency filtering shortest q Static correction Avendonk et al. , 2004) q Sorting in CDP domain q Velocity Analysis q NMO correction q Stacking with NMO velocity Inversion of the picked travel-times using path technique (Moser 1991; Van
Results Stacked section Along PGR Line 1(reflection seismic) 1 D velocity profile at point P 1(refraction seismic) q Northward dipping reflector ~ 3 - 3. 5 s demarcating the extent of overlying sediment deposit q We observe dislocation in the beds at might be the effect of HFT q 1 D velocity indicates top weathered layer of velocity 1. 2 - 1. 8 km/s overlying the bed rock
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