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• W4386198314 endingPage "24" @default.
• W4386198314 startingPage "1" @default.
• W4386198314 abstract "The Dadra-Nagar Haveli and the surrounding region, in western India, have been facing moderate seismicity since 1856. Two historic events (Magnitude Ms 5 in 1935 and Magnitude Ms 5.7 in 1856) were reported in the past in this region. Additionally, more than 200 earthquakes (1.0 ≤ M ≤ 5.7) were also reported between M 1 and 5.7 in this area. The epicentre of these earthquakes follows the trend of the faults mapped in the study area. Current study is aimed to map the tectonic features in the region and their associated tectonic-geomorphic features to infer the tectonic behaviour and their impact on seismic hazard in the western part of India. The RIAT of the watersheds of main rivers has been estimated through the analysis of geomorphic indices like stream length (SL) gradient, hypsometric integral (HI), basin shape (BS) and valley floor (VF) and three classes (class II high (1.3 ≤ RIAT < 1.5), class III—moderate (1.5 ≤ RIAT < 1.8), and class IV—low (1.8 ≤ RIAT)) have been found in the study area indicating it a seismically active region. The study area falls within the Panvel seismic zone and the recent seismicity has also been witnessed in the vicinity of N-S trending linear geological features. The presence of seismicity, faults with slickenside planes, shear zones with brittle nature, deformed dykes and extensional features suggests that the region has faced neotectonic activities and is even now active seismically. Through geological fieldwork, the evidence of past major seismic events (>5.5) is also found well preserved in the form of SSDS/seismites in quaternary sediments. The identified SSDS/seismites are mostly formed within the sandy silt, sandy gravel and clay beds; and include sills, dykes, suspended clast blocks, slump structures, and convolute bedding. The extent and dimension of these seismites indicate that the mechanism to trigger these and forces driven for the source of these features are shock waves of earthquake. The maximum moment magnitude of Mw 6.2 has been estimated based on the maximum displacement recorded along the normal active fault mapped in the study area, which trends N170°–N350°, with a sharp dip of 72° in the SW direction. The seismic hazard assessment of the area considering scenario earthquake of Mw 6.2 along this fault located east of Silvasa city has been estimated using the Stochastic Finite Fault Modelling simulation technique. A maximum peak ground acceleration (PGA) of the order of ~0.44 g has been assessed in the area with a maximum site amplification of 2.15." @default.
• W4386198314 created "2023-08-27" @default.
• W4386198314 creator A5019242629 @default.
• W4386198314 creator A5037708010 @default.
• W4386198314 creator A5077477923 @default.
• W4386198314 creator A5077943225 @default.
• W4386198314 date "2023-01-01" @default.
• W4386198314 modified "2023-09-25" @default.
• W4386198314 title "Signature of Active Tectonics and Its Implications Towards Seismic Hazard in Western Part of Stable Peninsular India" @default.
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