Probabilistic seismic hazard at the archaeological site of Gol Gumbaz in Vijayapura, south India

Abstract

Probabilistic seismic hazard analysis (PSHA) is carried out for the archaeological site of Vijayapura in south India in order to obtain hazard consistent seismic input ground-motions for seismic risk assessment and design of seismic protection measures for monuments, where warranted. For this purpose the standard Cornell-McGuire approach, based on seismogenic zones with uniformly distributed seismicity is employed. The main features of this study are the usage of an updated and unified seismic catalogue based on moment magnitude, new seismogenic source models and recent ground motion prediction equations (GMPEs) in logic tree framework. Seismic hazard at the site is evaluated for level and rock site condition with 10% and 2% probabilities of exceedance in 50 years, and the corresponding peak ground accelerations (PGAs) are 0.074 and 0.142 g, respectively. In addition, the uniform hazard spectra (UHS) of the site are compared to the Indian code-defined spectrum. Comparisons are also made with results from National Disaster Management Authority (NDMA 2010), in terms of PGA and pseudo spectral accelerations (PSAs) at T = 0.2, 0.5, 1.0 and 1.25 s for 475-and 2475-yr return periods. Results of the present study are in good agreement with the PGA calculated from isoseismal map of the Killari earthquake, M w = 6.4 (1993). Disaggregation of PSHA results for the PGA and spectral acceleration (S a) at 0.5 s, displays the controlling scenario earthquake for the study region as low to moderate magnitude with the source being at a short distance from the study site. Deterministic seismic hazard (DSHA) is also carried out by taking into account three scenario earthquakes. The UHS corresponding to 475-yr return period (RP) is used to define the target spectrum and accordingly, the spectrum-compatible natural accelerograms are selected from the suite of recorded accelerograms.

Seismic Hazard Analysis Using Fuzzy-Probabilistic Approach for Chennai City, South India

“…Hence, the present study focuses on carrying out the seismic hazard analysis by applying the proposed fuzzy -probabilistic approach by systematically compiling the earthquake data from 1800 to 2020 AD and accounting for the probabilistic and fuzzy uncertainties associated with the parameters of the seismic hazard. A few conventional hazard analyses carried out in India and southern PI (Nayak et al, 2015;Mridula et al, 2016;Ghosh & Chakraborty, 2017;Patil et al, 2018;Muzzaffar Khan & Kalyan Kumar, 2020;Sharma et al, 2020Sharma et al, & 2021 are also utilised in this study for compiling the earthquake catalogue and the hazard analysis procedure is improved with the addition of fuzzy uncertainty.…”