Abstract
Followed by the recent moderate January 3, 2017, Ambassa earthquake (Mw = 5.7) epicenter located at Dhalai district of Tripura, the state witnessed cases of ground failures due to liquefaction, landslides, and several cases of partial and complete damage of non-engineered/semi-engineered houses/buildings within the near vicinity of epicentral areas. Reconnaissanse study of failures prompted to carry out local site response analysis of important urban agglomeration in order to estimate the seismic hazard for a future event. Above all, Tripura is situated in the severely vulnerable zone (zone V) as per seismic zoning map of India. In this context, the present study is aimed to perform one-dimensional ground response analysis (1D GRA) of Agartala town, the capital place of Tripura where significant infrastructural growth is booming up presently due to its salient location in the global map. The geological condition of this area categorized as sedimented ‘Bengal basin’ with relatively younger alluvium/fluvial river deposits of Holocene age. Site classes D and E of the NEHRP classification are dominant in the area investigated. 1D nonlinear GRA is performed using DEEPSOIL on twenty representative boreholes data. Synthetic ground motion is generated considering past local earthquakes using Boore’s point source model (Boore 1983, 2003) and used in this study since reliable ground motion data from potentially damaging past earthquakes are scarce in this region.
Keywords
- Site response
- Earthquake
- Seismic analysis
- Ground motion
- Geotechnical investigation
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Das, R., Saha, R., Debnath, R. (2022). Assessment of Local Seismic Hazard of Agartala Based on Nonlinear Site Response Analysis. In: Satyanarayana Reddy, C.N.V., Muthukkumaran, K., Satyam, N., Vaidya, R. (eds) Ground Characterization and Foundations. Lecture Notes in Civil Engineering, vol 167. Springer, Singapore. https://doi.org/10.1007/978-981-16-3383-6_27
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