Reconstruction of active surface deformation in the Rishi Ganga basin, Central Himalaya using PSInSAR: A feedback towards understanding the 7th February 2021 Flash Flood

Kothyari, Girish Ch; Joshi, N. V.; Taloor, Ajay Kumar; Malik, Kapil; Dumka, Rakesh K.; Sati, S. P.; Sundriyal, Yaspal

doi:10.1016/j.asr.2021.07.002

Cited by 39 publications

(14 citation statements)

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“…Finally, the line‐of‐sight displacement has been estimated after fine‐tuned temporal coherence. The measured line‐of‐sight displacement of each image shows changes in the interferometric phases (Kothyari et al, 2021; Malik et al, 2021). Additionally, the SAR products are also processed by ASF DAAC HyP3 2022 using the hyp3_gamma plugin version 5.1.4 running GAMMA release 20,210,701 online version.…”

Section: Methodsmentioning

confidence: 99%

“…The ground deformation (uplift/subsidence) in the active thrust/fault/fold belt is the most owing to the movement along active faults (Dumka et al, 2018; Kandregula et al, 2021; Kothyari et al, 2021; Lakhote et al, 2020). The active ground subsidence in rapidly growing urban regions is also associated with the over‐extraction of sub‐surface water (Malik et al, 2021; Perissin, 2015; Perissin et al, 2011; Perissin & Wang, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…The active ground subsidence in rapidly growing urban regions is also associated with the over‐extraction of sub‐surface water (Malik et al, 2021; Perissin, 2015; Perissin et al, 2011; Perissin & Wang, 2011). The ground deformation in the form of land uplift and subsidence is expressed by the presence of tensional cracks on the ground, frequent occurrence of landslides, folding/faulting of recent sediments, formation of sag or pressure ridges (Joshi et al, 2021; Kandregula et al, 2021; Kothyari et al, 2021). Globally such active features can be estimated from the interferometric synthetic aperture radar (InSAR) measurements (Abidin et al, 2016; Chen et al, 2018; Dumka et al, 2018; He et al, 2020; Lakhote et al, 2020; Malik et al, 2021) because of its larger coverage and meticulous mm level accuracy (Abidin et al, 2016; Chaussard et al, 2014; Galloway & Burbey, 2011; Wasowski & Bovenga, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Globally such active features can be estimated from the interferometric synthetic aperture radar (InSAR) measurements (Abidin et al, 2016; Chen et al, 2018; Dumka et al, 2018; He et al, 2020; Lakhote et al, 2020; Malik et al, 2021) because of its larger coverage and meticulous mm level accuracy (Abidin et al, 2016; Chaussard et al, 2014; Galloway & Burbey, 2011; Wasowski & Bovenga, 2014). In the present study, we used Sentinel‐1A data products whose strip or bandwidth is around 250 km, with a high spatial resolution and larger coverage, shorter period of observation points and capable, of sleuthing negligible ground fluctuations in different tectonically and climatically active regions (Chen et al, 2018; Di Traglia et al, 2018; Dumka et al, 2018; He et al, 2020; Kothyari et al, 2021; Malik et al, 2021; Wu et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Almora group, 10. Ramgarh group) Kandregula et al, 2021;Kothyari et al, 2021). Globally such active features can be estimated from the interferometric synthetic aperture radar (InSAR) measurements (Abidin et al, 2016;Chen et al, 2018;Dumka et al, 2018;He et al, 2020;Lakhote et al, 2020;Malik et al, 2021) because of its larger coverage and meticulous mm level accuracy (Abidin et al, 2016;Chaussard et al, 2014;Galloway & Burbey, 2011;Wasowski & Bovenga, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Active tectonics in the Main Boundary Thrust zone, Garhwal Himalaya, as evident from palaeoseismic signatures, morphotectonic features and PSI base ground deformation

2022

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In the Garhwal Himalaya, the steeply inclined Main Boundary Thrust (MBT) is characterized by landforms that indicate towards tectonic activity in the recent past. Linear active fault trace, sub‐recent fault scarps, strath terrace, uplifted terraces, deflected drainage, and triangular facet cones are some of the morphotectonic evidences of recent tectonic activity along the MBT. The MBT is defined by active fault trace in the form of linear depression and shows a prominent slope break across it. Thrusting of the Lesser Himalayan bedrocks over the colluvial deposits and back tilting of the colluvial deposits are also observed in the MBT zone. The formation of the sag pond and the deposition of the Quaternary lacustrine sediments followed by the deformation of the lacustrine deposits indicate phases of tectonic activities along the MBT. The later phase of deformation is represented by the folded lacustrine and colluvial deposits, where the amplitude of the fold measures about 3 m‐high and the deformed section measures about 23 m in length. The ongoing deformation patterns of the MBT zone have also been monitored with the help of Synthetic Aperture Radar‐based time series analysis. We used Sentinel‐1C dataset in ascending direction with polarization of the VV+ VH acquired between December 2, 2017 to September 7, 2021 to identify phase changes caused by ongoing active deformation. The Persistent Scatterer Interferometry (PSI) result based on Sentinel‐1A suggests that the Dehradun–Mussoorie and adjoining region has undergone an average deformation of 5.5 to −11 mm/year and the ground displacement of 1.5 to −3.8 cm. The time series analysis reveals that the Mussoorie hills in the MBT zone have higher rate of deformation.

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Section: Methodsmentioning

confidence: 99%