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This paper presents the quantification of effects of local soi1 conditions in form of amplification factors for seismic microzonation of Delhi. The general procedure adopted in this investrgation for evaluating ground motion amplification is based on the use of the one-Dimensional equivalent-Linear model. A series of soil models have been developed that represent a simplified version of the geologic conditions that occur within the study area. The determination of depth and velocity values used for the half-Space boundary is based on the deep shear wave velocity profiles reported at different sites. Different maps such as resonance frequency, soil thickness, maximum ground motion amplification factors at resonance, average ground motion amplification factors in different frequency bands, etc are presented for variety of end-User communities, including structural and geotechnical engineers, building officials, emergency managers, land-Use planners, private businesses, and the general public. The maps reported in this study are preliminary in nature and need upgradation when an area is covered with much denser soil information.

Keywords

Ground Motion Amplification, Fundamental Frequency, Regional Seismic Hazards, Geotechnical-Site Effects, Microzonation, Delhi Area.

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