Probabilistic seismic hazard analysis using the logic tree approach – Patna district (India)

• Main Authors: P. Anbazhagan, K. Bajaj, K. Matharu, S. S. R. Moustafa, N. S. N. Al-Arifi
• Format: Article
• Language: English
• Published: Copernicus Publications 2019-10-01
• Series: Natural Hazards and Earth System Sciences
• Online Access: https://www.nat-hazards-earth-syst-sci.net/19/2097/2019/nhess-19-2097-2019.pdf

<p>Peak ground acceleration (PGA) and study area (SA) distribution for the Patna district are presented considering both the classical and zoneless approaches through a logic tree framework to capture the epistemic uncertainty. Seismicity parameters are calculated by considering completed and mixed earthquake data. Maximum magnitude is calculated using three methods, namely the incremental method, Kijko method, and regional rupture characteristics approach. The best suitable ground motion prediction equations (GMPEs) are selected by carrying out an “efficacy test” using log likelihood. Uniform hazard response spectra have been compared with Indian standard BIS 1893. PGA varies from 0.38 to 0.30&thinsp;<span class="inline-formula"><i>g</i></span> from the southern to northern periphery considering 2&thinsp;% probability of exceedance in 50 years.</p>