Seismic microzonation of Hanoi, Vietnam using microtremor observations

Tuladhar, Rabin, Cuong, Nhu Nguyen Hong, and Yamazaki, Fumio (2004) Seismic microzonation of Hanoi, Vietnam using microtremor observations. In: Proceedings of 13th World Conference on Earthquake Engineering. 2539. pp. 1-8. From: 13th World Conference on Earthquake Engineering, 1-6 August 2004, Vancouver, BC, Canada.

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Abstract

It is imperative to carry out comprehensive seismic hazard assessment for big cities in order to reduce the potential damage from earthquakes. One of the fundamental steps in seismic hazard assessment is microzonation of cities, which provides a basis for site-specific hazard analysis. This study focuses on microzonation of Hanoi, the capital city of Vietnam, using microtremor observations. Microtremor observations were carried out at 63 sites in Hanoi. The predominant period of the ground at all the sites were determined from the horizontal to vertical (H/V) spectral ratios of microtremors and a microzonation map was developed for Hanoi on the basis of the variation of the predominant period of the ground. It was observed that in Hanoi, the northern part of the city has shorter predominant period (less than 0.4 s) and the predominant period of the ground increases towards south. The areas in the Hanoi metropolitan area, especially areas located along the Red River and around the West Lake have comparatively longer predominant period (0.6-1.0 s). The western districts of Hanoi also have longer predominant period (0.6-1.2 s) and it decreases towards the eastern direction. This study shows that there is a possibility of long-period ground motion in Hanoi, especially in Hanoi metropolitan area and western and southern districts of Hanoi. The long-period ground motion may have severe effects on high-rise buildings and other long-period structures.

Item ID: 16818
Item Type: Conference Item (Research - E1)
Keywords: seismic microzonation, earthquake, seismic hazard assessment, Hanoi, microtremor
Date Deposited: 10 Aug 2017 23:03
FoR Codes: 09 ENGINEERING > 0905 Civil Engineering > 090504 Earthquake Engineering @ 50%
09 ENGINEERING > 0905 Civil Engineering > 090506 Structural Engineering @ 50%
SEO Codes: 87 CONSTRUCTION > 8702 Construction Design > 870201 Civil Construction Design @ 100%
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