Acquisition and Analysis of Surface Wave Data in the Indo Gangetic Basin

Anbazhagan, P and Bajaj, K and Moustafa, SSR and Al-Arifi, NSN (2019) Acquisition and Analysis of Surface Wave Data in the Indo Gangetic Basin. In: 2nd GeoMEast International Congress and Exhibition on Sustainable Civil Infrastructures, Egypt 2018 - The official international congress of the Soil-Structure Interaction Group in Egypt, SSIGE 2018, 24 - 28 November 2018, Cairo, pp. 60-72.

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Abstract

Seismic activity in the tectonically active Himalayan region can result in devastation in the contagious deep Indo-Gangetic Basin (IGB). It is filled by alluvial deposits and, therefore, prone to site amplification. IGB had experienced catastrophic earthquake damages due to the presence of thick soil depth of 0.05Â km to about 4Â km. However, very few studies have presented seismic site characterization of the IGB soil up to the shallow depth, and very limited attempts have been made to measure the dynamic properties of the deep soil column. Hence, in this study, shear velocity profile ( \mathbfV\mathbfs ) up to 400Â m depth is measured using combined active and passive multichannel analysis of surface wave (MASW) survey in 275 selected locations in IGB. Acquisition and processing of the seismic surface wave data to obtain the \mathbfV\mathbfs profiles at shallow and deep depths are discussed in this paper. Parametric study has been done to identify the variation in dispersion and \mathbfV\mathbfs profiles by recording time, different sampling interval, different polarity and gain. It has been seen that changing any parameter during data recording may result in variation in \mathbfV\mathbfs . Further, the surveyed sites are classified and characterized based on time-averaged \mathbfV\mathbfs in the upper 30Â m depth as per National Earthquake Hazards Reduction Program seismic site classification. \mathbfV\mathbfs30 values vary from 157 to 1152Â m/s in the entire stretch of IGB. This is the first time such extensive study was carried out in IGB for \mathbfV\mathbfs determination at deep and shallow depths.

Item Type:	Conference Paper
Publication:	Sustainable Civil Infrastructures
Publisher:	Springer Science and Business Media B.V.
Additional Information:	The copyright for this article belongs to Springer Science and Business Media B.V.
Keywords:	Geology; Shear flow; Soil structure interactions; Soils; Surface waves; Surveys, Alluvial deposits; Catastrophic earthquake; Earthquake hazard; Indo-Gangetic basin; Multi-channel analysis of surface waves; Seismic surface wave; Site amplification; Surface wave data, Earthquakes
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	29 Nov 2022 09:47
Last Modified:	29 Nov 2022 09:47
URI:	https://eprints.iisc.ac.in/id/eprint/78114

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