Vipin, KS and Sitharam, TG (2013) Delineation of seismic source zones based on seismicity parameters and probabilistic evaluation of seismic hazard using logic tree approach. In: Journal of Earth System Science, 122 (3). pp. 661-676.
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Abstract
The delineation of seismic source zones plays an important role in the evaluation of seismic hazard. In most of the studies the seismic source delineation is done based on geological features. In the present study, an attempt has been made to delineate seismic source zones in the study area (south India) based on the seismicity parameters. Seismicity parameters and the maximum probable earthquake for these source zones were evaluated and were used in the hazard evaluation. The probabilistic evaluation of seismic hazard for south India was carried out using a logic tree approach. Two different types of seismic sources, linear and areal, were considered in the present study to model the seismic sources in the region more precisely. In order to properly account for the attenuation characteristics of the region, three different attenuation relations were used with different weightage factors. Seismic hazard evaluation was done for the probability of exceedance (PE) of 10% and 2% in 50 years. The spatial variation of rock level peak horizontal acceleration (PHA) and spectral acceleration (Sa) values corresponding to return periods of 475 and 2500 years for the entire study area are presented in this work. The peak ground acceleration (PGA) values at ground surface level were estimated based on different NEHRP site classes by considering local site effects.
| Item Type: | Journal Article |
|---|---|
| Publication: | Journal of Earth System Science |
| Publisher: | Indian Academy of Sciences |
| Additional Information: | Copyright of this article belongs to Indian Academy of Sciences. |
| Keywords: | Source Zone; PSHA; Logic Tree; Site Response; PHA; PGA; Sa; Local Site Effects |
| Department/Centre: | Division of Mechanical Sciences > Civil Engineering |
| Date Deposited: | 21 Aug 2013 06:15 |
| Last Modified: | 21 Aug 2013 06:15 |
| URI: | http://eprints.iisc.ac.in/id/eprint/46984 |
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