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Title: Effects on amplification of strong ground motion due to deep soils
Authors: Jakka, Ravi Sankar
Hussain M.
Sharma, Mukat Lal
Published in: Geomechanics and Engineering
Abstract: Many seismically vulnerable regions in India and worldwide are located on deep soil deposits which extend to several hundred meters of depth. It has been well recognized that the earthquake shaking is altered by geological conditions at the location of building. As seismic waves propagates through uppermost layers of soil and rock, these layers serve as filter and they can increase the duration and amplitude of earthquake motion within narrow frequency bands. The amplification of these waves is largely controlled by mechanical properties of these layers, which are function of their stiffness and damping. Stiffness and damping are further influenced by soil type and thickness. In the current study, an attempt has been made to study the seismic site response of deep soils. Three hypothetical homogeneous soil models (e.g., soft soil, medium soil and hard soil) lying on bedrock are considered. Depth of half space is varied from 30 m to 2,000 m in this study. Controlled synthetic motions are used as input base motion. One dimensional equivalent linear ground response analyses are carried out using a computer package DEEPSOIL. Conventional approach of analysing up to 30 m depth has been found to be inadequate for deep soil sites. PGA values are observed to be higher for deeper soil profiles as compared to shallow soil profiles indicating that deeper soil profiles are more prone to liquefaction and other related seismic hazards under earthquake ground shaking. The study recommends to deal the deeper soil sections more carefully for estimating the amplification factors for seismic hazard assessment at the surface. © 2015 Techno-Press, Ltd.
Citation: Geomechanics and Engineering (2015), 8(5): 663-674
Issue Date: 2015
Publisher: Techno Press
Keywords: Amplification
Deep soil
Ground response analysis
Synthetic controlled motion
ISSN: 2005307X
Author Scopus IDs: 26532830500
Author Affiliations: Jakka, R.S., Department of Earthquake Engineering, Indian Institute of Technology Roorkee247667, India
Hussain, M., Department of Civil Engineering, Aligarh Muslim University, Aligarh, 202002, India
Sharma, M.L., Department of Earthquake Engineering, Indian Institute of Technology Roorkee247667, India
Corresponding Author: Jakka, R.S.; Department of Earthquake Engineering, Indian Institute of Technology RoorkeeIndia
Appears in Collections:Journal Publications [EQ]

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