Ambient noise H/V spectral ratio in site effects estimation in Fateh jang area,Pakistan |
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| Authors: | S M Talha Qadri Bushra Nawaz S H Sajjad Riaz Ahmad Sheikh |
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| Institution: | 1.Department of Earth Sciences, University of Sargodha, Sargodha, Pakistan2.College of Earth and Environmental Sciences, University of the Punjab, Lahore, Pakistan |
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| Abstract: | Local geology or local site effect is a crucial component while conducting seismic risk assessment studies. Investigations made by utilization of ambient noise are an effective tool for local site estimation. The present study is conducted to perform site response analysis at 13 different sites within urban settlements of Fateh jang area (Pakistan). The aim of this study was achieved by utilizing Nakamura method or H/V spectral ratio method. Some important local site parameters, e.g., the fundamental frequencies f0 of soft sediments, amplitudes A0 of corresponding H/V spectral ratios, and alluvium thicknesses over 13 sites within the study area, were measured and analyzed. The results show that the study area reflects low fundamental frequency f0. The fundamental frequencies of the sediments are highly variable and lie in a range of 0.6-13.0 Hz. Similarly, amplification factors at these sites are in the range of 2.0-4.0. |
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| Keywords: | Local site effect Ambient noise H/V spectral ratios Fundamental frequency Amplification factor Alluvium thickness |
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