TAILIEUCHUNG - Probabilistic seismic hazard assessment for Hanoi city

In this study, the methodology of probabilistic seismic hazard assessment proposed by cornell and Esteva in 1968 was applied for Hanoi city, using an earthquake catalog updated until 2018 and a comprehensive seismotectonic model of the territory of Vietnam and adjacent sea areas. | Vietnam Journal of Earth Sciences 41 4 321-338 Doi 0866-7187 41 4 14235 VAST Vietnam Academy of Science and Technology Vietnam Journal of Earth Sciences http jse Probabilistic seismic hazard assessment for Hanoi city Pham The Truyen 1 2 Nguyen Hong Phuong1 2 3 1 Institute of Geophysics VAST Hanoi Vietnam 2 Graduate University of Science and Technology VAST Hanoi Vietnam 3IRD Sorbonne Unỉversỉtés UPMC Univ Paris 06 Unite Mixte Internationale de Modélisation Mathématique et Informatiques des Systèmes Complexes UMMISCO 32 venue Henri Varagnat 93143 Bondy Cedex France Received 2 May 2019 Received in revised form 9 August 2019 Accepted 1 September 2019 ABSTRACT In this study the methodology of probabilistic seismic hazard assessment proposed by Cornell and Esteva in 1968 was applied for Hanoi city using an earthquake catalog updated until 2018 and a comprehensive seismotectonic model of the territory of Vietnam and adjacent sea areas. Statistical methods were applied for declustering the earthquake catalog then the maximum likelihood method was used to estimate the parameters of the Gutenberg-Richter Law and the maximum magnitude for each seismic source zone. Two GMPEs proposed by Campbell Bozorgnia 2008 and Akkar et al. 2014 were selected for use in hazard analysis. Results of PSHA for Hanoi city are presented in the form of probabilistic seismic hazard maps depicting peak horizontal ground acceleration PGA as well as 5-hertz sec period and 1-hertz sec. period spectral accelerations SA with 5-percent damping on a uniform firm rock site condition with 10 5 2 and 0 5 probability of exceedance in 50 years corresponding to return times of 475 975 2 475 and 9 975 years respectively. The results of PSHA show that for the whole territory of Hanoi city for all four return periods the predicted PGA values correspond to the intensity of VII to IX degrees according to the MSK-64 scale. As for the SA maps for all four return periods the .

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