Ambient noise H/V spectral ratio in site effects estimation in Fateh jang area, Pakistan

作     者：S.M.Talha Qadri Bushra Nawaz S.H.Sajjad Riaz Ahmad Sheikh 

作者机构：Department of Earth SciencesUniversity of Sargodha College of Earth and Environmental SciencesUniversity of the Punjab 

出 版 物：《Earthquake Science》 (地震学报（英文版）)

年 卷 期：2015年第28卷第1期

页      面：87-95页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

主　　题：Local site effectspectral ratios Fundamentalfactor Alluvium thickness Ambient noise H/Vfrequency Amplification 

摘      要：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 fre- quencies f0 of soft sediments, amplitudes A0 of corre- sponding 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 fo. 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.