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Establishing Seismic Site Class for 4 Recording Stations in Uttarakhand Based on Generalized Inversion and 1-D Equivalent Linear Site-Specific Response Analysis
In order to understand the current seismicity in different parts of seismicity active regions of India, more than 300 state-of-the-art strong motion recording stations are installed. The ground motion records from these recording stations are available in PESMOS Web site. Currently, PESMOS database is a significant source of ground motion records in India. A serious drawback of PESMOS database is that the recording stations are classified based on the physical description of local geology following Seismotectonic Atlas of India and not based on in situ field tests. Earlier studies have highlighted ambiguity in the site class (SC) assigned by PESMOS for these recording stations. Accurate assessment of SC of recording stations is essential in order to fully utilize the PESMOS database for regional seismic hazard studies. Several research efforts have been directed toward the use of generalized inversion (GINV) technique as a tool to estimate the local site condition. There is general agreement among the scientific community with regard to the peak frequency (fpeak) obtained from the GINV method to identify the soil fundamental frequency. In this study, SC (based on NEHRP classification scheme) of 4 recording stations, located in the region of Uttarakhand, India, which are part of PESMOS database, is established using GINV method. In addition, the obtained SCs are compared based on outcomes from 1-D equivalent linear site specific response analysis. The value of fpeak obtained from above-mentioned methods shows 1:1 matching.
Establishing Seismic Site Class for 4 Recording Stations in Uttarakhand Based on Generalized Inversion and 1-D Equivalent Linear Site-Specific Response Analysis
In order to understand the current seismicity in different parts of seismicity active regions of India, more than 300 state-of-the-art strong motion recording stations are installed. The ground motion records from these recording stations are available in PESMOS Web site. Currently, PESMOS database is a significant source of ground motion records in India. A serious drawback of PESMOS database is that the recording stations are classified based on the physical description of local geology following Seismotectonic Atlas of India and not based on in situ field tests. Earlier studies have highlighted ambiguity in the site class (SC) assigned by PESMOS for these recording stations. Accurate assessment of SC of recording stations is essential in order to fully utilize the PESMOS database for regional seismic hazard studies. Several research efforts have been directed toward the use of generalized inversion (GINV) technique as a tool to estimate the local site condition. There is general agreement among the scientific community with regard to the peak frequency (fpeak) obtained from the GINV method to identify the soil fundamental frequency. In this study, SC (based on NEHRP classification scheme) of 4 recording stations, located in the region of Uttarakhand, India, which are part of PESMOS database, is established using GINV method. In addition, the obtained SCs are compared based on outcomes from 1-D equivalent linear site specific response analysis. The value of fpeak obtained from above-mentioned methods shows 1:1 matching.
Establishing Seismic Site Class for 4 Recording Stations in Uttarakhand Based on Generalized Inversion and 1-D Equivalent Linear Site-Specific Response Analysis
Lecture Notes in Civil Engineering
Patel, Satyajit (editor) / Solanki, C. H. (editor) / Reddy, Krishna R. (editor) / Shukla, Sanjay Kumar (editor) / Harinarayan, N. H. (author) / Mondal, Joy Kumar (author) / Kumar, Abhishek (author)
2021-05-06
12 pages
Article/Chapter (Book)
Electronic Resource
English