Probabilistic seismic hazard analysis for Bangalore |
| |
Authors: | P Anbazhagan J S Vinod T G Sitharam |
| |
Institution: | (1) Department of Civil Engineering, Indian Institute of Science, Bangalore, 560012, India |
| |
Abstract: | This article presents the results of probabilistic seismic hazard analysis (PSHA) for Bangalore, South India. Analyses have
been carried out considering the seismotectonic parameters of the region covering a radius of 350 km keeping Bangalore as
the center. Seismic hazard parameter ‘b’ has been evaluated considering the available earthquake data using (1) Gutenberg–Richter (G–R) relationship and (2) Kijko
and Sellevoll (1989, 1992) method utilizing extreme and complete catalogs. The ‘b’ parameter was estimated to be 0.62 to 0.98 from G–R relation and 0.87 ± 0.03 from Kijko and Sellevoll method. The results
obtained are a little higher than the ‘b’ values published earlier for southern India. Further, probabilistic seismic hazard analysis for Bangalore region has been
carried out considering six seismogenic sources. From the analysis, mean annual rate of exceedance and cumulative probability
hazard curve for peak ground acceleration (PGA) and spectral acceleration (Sa) have been generated. The quantified hazard
values in terms of the rock level peak ground acceleration (PGA) are mapped for 10% probability of exceedance in 50 years
on a grid size of 0.5 km × 0.5 km. In addition, Uniform Hazard Response Spectrum (UHRS) at rock level is also developed for
the 5% damping corresponding to 10% probability of exceedance in 50 years. The peak ground acceleration (PGA) value of 0.121 g
obtained from the present investigation is slightly lower (but comparable) than the PGA values obtained from the deterministic
seismic hazard analysis (DSHA) for the same area. However, the PGA value obtained in the current investigation is higher than
PGA values reported in the global seismic hazard assessment program (GSHAP) maps of Bhatia et al. (1999) for the shield area. |
| |
Keywords: | Seismicity ‘ b’ value Probability Seismic hazard analysis Spectral acceleration and return period |
本文献已被 SpringerLink 等数据库收录! |
|