Site-Specific Analysis of Delhi Region for Scenario Earthquakes

Abstract eng:
The importance of site-specific analysis for Delhi region has been explored in this paper. Seismologists have estimated the probability of occurrence of great earthquake of moment magnitude 8.5 from the large unbroken segment called central seismic gap of Himalayan region in the next 100 years is 0.59. Delhi capital city of India is situated roughly 200 to 300 km from central seismic gap. In this paper, rock outcropping motions have been generated for a reference site at Delhi Ridge observatory, for the scenario earthquakes of moment magnitude Mw = 7.5, Mw =8.0 and Mw = 8.5 from central seismic gap. Equivalent linear one dimensional wave propagation analyses have been carried out for three actual sites at Delhi for which borelog details are available upto the bedrock. The site-specific spectra and the corresponding building response have been estimated and the importance of site-specific analysis for Delhi region has been brought out.

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