Geodetic characterization of active Katrol Hill Fault (KHF) of Central Mainland Kachchh, western India

SuriBabu, D.; Dumka, Rakesh K.; Paikray, Joydeep; Kothyari, Girish Ch; Thakkar, M. G.; Swamy, K. V.; Taloor, Ajay Kumar; Prajapati, Sandip

doi:10.1016/j.geog.2021.05.003

Cited by 11 publications

(5 citation statements)

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“…Furthermore, the variation in the deformation among the sites (ANJA, STPR, VAND) along KHF is due to the segmented behaviour of the fault and indicate that the eastern part of the KHF is tectonically more active. The geodetic and InSAR study highlighted the segmented behaviour of the KHF and the higher amount of deformation towards the eastern segment of the KHF (Dumka et al, 2020; Suribabu et al, 2022). Similarly, geological investigation based on GPR and geomorphology suggests segmented behaviour of the KHF (Maurya et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

“…The maximum motion of 2.4 ± 0.5 mm/year and 2.0 is observed by the sites ANJA and KUAR, respectively, with an average 1.0 ± 0.5 mm/year for the remaining sites (Figure 4a) (Table 1). The GPS sites; ANJA, Suribabu et al, 2022). Similarly, geological investigation based on GPR and geomorphology suggests segmented behaviour of the KHF (Maurya et al, 2016).…”

Section: Grace Observationsmentioning

confidence: 90%

“…Tectonically, the KRB constitute Island Belt Fault (IBF), Gedi Fault (GF), North Wagad Fault (NWF), South Wagad Fault (SWF), Kachchh Mainland Fault (KMF), Katrol Hill Fault (KHF), Vigodi Fault (VF), Gora Dungar Fault (GDF) in between the NKF to NPF and most of them are E-W trending (Biswas, 1987(Biswas, , 1993(Biswas, , 2005Kothyari et al, 2018) (Figure 1). The zone located in the vicinity of 2001 (M7.7) event reveals enhanced strain and seismicity in the KRB and indicates the active nature of faults in the central-eastern KRB (Dumka et al, 2019;Dumka & Rastogi, 2013;Kothyari et al, 2018;Suribabu et al, 2022). The E-W trending Island Belt Fault (IBF) towards the north is supposed to be responsible for the uplift of Bela, Khadir and Pachham Islands (Biswas, 1987(Biswas, , 2005(Biswas, , 2016Biswas & Deshpande, 1970;Dumka, Kotlia, Kothyari, et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…The detailed geological investigation by (Biswas, 1987(Biswas, , 2005(Biswas, , 2014Kothyari et al, 2019Kothyari et al, , 2022McCalpin & Thakkar, 2003;Pande et al, 2003) followed by few geophysical investigations (Mandal et al, 2004;Mohan et al, 2017;Pavan et al, 2017;Singh et al, 2017;Suribabu et al, 2022) concluded that these faults are vertical to near vertical in nature. The geological and geomorphic investigations suggest SWF as a near-vertical step-over fault of KMF (Biswas, 2005; F I G U R E 1 Study area map towards the western part of India, depicting fault systems of Kachchh region along with the location of major earthquakes (red star) triggered during last two centuries.…”

Section: Introductionmentioning

confidence: 99%

“…This part is the host of the recent M7.7 (2001) earthquake and thereafter a few moderate earthquakes. The detailed geological investigation by (Biswas, 1987, 2005, 2014; Kothyari et al, 2019, 2022; McCalpin & Thakkar, 2003; Pande et al, 2003) followed by few geophysical investigations (Mandal et al, 2004; Mohan et al, 2017; Pavan et al, 2017; Singh et al, 2017; Suribabu et al, 2022) concluded that these faults are vertical to near vertical in nature. The geological and geomorphic investigations suggest SWF as a near‐vertical step‐over fault of KMF (Biswas, 2005; Kothyari et al, 2017; Kothyari, Dumka, et al, 2016) and fault plane study of 2001 main event by (Negishi et al, 2002) established SWF as a causative fault (Kothyari et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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GPS and InSAR derived evidences of intra‐basin stress and strike‐slip tectonics in the vicinity of 2001 (M7.7) earthquake, Kachchh, western India

et al. 2022

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The current geodetic investigation is based on nearly a decade of continuous Global Positioning System (GPS) data towards the western part of the Indian Plate (2009–2019). This research focused on the Kachchh Rift Basin (KRB), the seismically most active intra‐plate region of the Indian Plate, which has seen three ≥ M 7.0 earthquakes in the last two centuries. The GPS stations on the northern and southern margins show SSW and NNE directed motion, indicating that the KRB is currently under the influence of regional compressive stress on both flanks and the same is reflected in the form of earthquake activity in the center portion. Furthermore, the existence of intra‐basin stress, in addition to regional stress, increases strain accumulation and results in the creation of a Principal Deformation Zone (PDZ) in the central part of the KRB. The average annual deformation in the middle of KRB remains 1.0 ± 0.5 mm/year, while sites near the South Wagad Fault (SWF) experience 1.2 mm/year of fault parallel motion. The dominant fault normal motion along the flanks with a maximum fault parallel motion in the middle intimates the existence of strike‐slip tectonics in the central Kachchh. The geometric relationship of strike‐slip faults in a compressive margin and strain accumulation in pre‐existing faults (PDZ) is responsible for current strike‐slip and thrust motion in the Kachchh, including the 2001 Bhuj earthquake (M 7.7). Our geodetic model is well‐corroborated with the geological observations of the wrench fault model of strike‐slip faults. PS‐InSAR results in the northern part of the region between Khadir and Bela Islands show ≤6.0 mm of annual LOS displacement. GPS results indicate ≈ 1.3 to 1.4 ± 0.5 mm/year of fault parallel motion along the transverse Ekal Amrapar Fault (EAF). The non‐significant variation in GRACE‐derived TWS values (from 2009 to 2018) rules out non‐tectonic deformation in the vicinity of EAF and thus points to tectonic activity as the cause of the derived deformation in the region.

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Section: Resultsmentioning

confidence: 99%

Section: Grace Observationsmentioning

confidence: 90%