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- W2306567866 abstract "The Bouguer anomaly of Kutch shows several gravity highs and lows, primarily attributed to fault-controlled basement uplifts and depressions. Gravity modelling suggests larger thickness of sediments t owards the south and a general uplift of basement t owards the north, descending stepwise towards the south indicating post -rift vertical tectonics. This might be respo nsible for the basement uplifts controlled by thrust faults with about 2–3 km upthrow. However, their listric nature dipping towards the south in depth su ggests that horizontal forces due to plate movemen t may have also contributed to their evolution. Circular gravity highs observed over islands (uplifts) in the northern part of Kutch along Island Belt Fault and their modelling suggest high-density rocks at the basement, which may represent volcanic plugs or su bsurface mafic rocks. The isostatic regional derived from the Bouguer anomaly map provides two centres of mass deficiencies in this region located under the SE part of the Kutch Mainland Uplift (KMU) and the Wagad uplift separated by a NW–SE trend coinciding with the strike slip fault, west of the Wagad uplift. Crustal thickness model based on isostatic regional varies from 35 km along the coast to 44 km under the SE part of KMU and Wagad uplift, which is controlled by faults and suggests isostatic ove rcompensation. The Bhuj earthquake of 26 January 2001 and its aftershocks are concentrated in the zone of interse ction of the thrust faults: Kutch Mainland fault, south and north Wagad fault and NW–SE and NE–SW structural trends, which are delineated based on gravity anomalies. The isostatic overcompensation causes differential uplift and erosion, resulting in vertical stress. This along with the horizontal stress resulting from the movement of the Indian plate might be r esponsible for large magnitude and relatively frequent earthquakes in this region. KUTCH represents the northernmost part of the Atlantic type, western passive margin of India and lies close to the western convergent boundary of the Indian plate with the Eurasian plate 1 . The NE–SW moveme nt of the Indian" @default.
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- W2306567866 date "2002-01-01" @default.
- W2306567866 modified "2023-09-27" @default.
- W2306567866 title "Some geodynamic aspects of Kutch basin and seismicity: An insight from gravity studies" @default.
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