This is the first time the LPI based method was applied for evaluation of earthquake-induced liquefaction for Hanoi city. The most advantage of the method is that it can be easy to use, although the reliability of the results depends very much on number and distribution of the borehole data. Nevertheless, the combination of this method with other available methods can help effectively solving the problem of urban seismic risk assessment for the mega-cities in Vietnam. | Vietnam Journal of Earth Sciences, 40(1), 78-96, Doi: Vietnam Academy of Science and Technology Vietnam Journal of Earth Sciences (VAST) Assessment of earthquake-induced liquefaction hazard in urban areas of Hanoi city using LPI-based method Bui Thi Nhung1*, Nguyen Hong Phuong1, 2, 3, Pham The Truyen1, 2, Nguyen Ta Nam1 1 Institute of Geophysics, Vietnam Academy of Science and Technology Graduate University of Science and Technology, Vietnam Academy of Science and Technology 3 IRD, Sorbonne Universités, UPMC Univ Paris 06, Unité Mixte Internationale de Modélisation Mathématique et Informatiques des Systèmes Complexes (UMMISCO)32 Venue Henri Varagnat, 93143 Bondy Cedex, France 2 Received 8 August 2017; Received in revised form 9 December 2017; Accepted 11 December 2017 ABSTRACT Liquefaction Potential Index (LPI) is used as an assessing tool of liquefaction potential. In this study, the LPIbased method was applied to evaluate the earthquake-induced liquefaction potential for the urban area of Hanoi city. The data used includes 120 boreholes logs, containing necessary geomechanical information such as fine contents, specific gravity, dry density, porosity, N (SPT) values and the groundwater depth Z(w) of subsoil layers in every borehole. The “simplified procedure” proposed by Seed and Idriss was applied to evaluate the liquefaction of all subsoil layers in each borehole point. Then, the Liquefaction Potential Index was calculated for the whole soil column at all boreholes points using the method proposed by Iwasaki. Finally, the obtained LPI values were used to assess the liquefaction probability for an urban area of Hanoi city, using the empirical formula proposed by Papathanassiou and two earthquake scenarios originated on the Chay River fault with magnitudes of and , respectively. For entire study area, the first scenario earthquake (Mw=) is not capable of causing liquefaction .
