First-level liquefaction hazard mapping of Laoag City, Northern Philippines

Beroya, M.A.A and Aydin, A. (2007) First-level liquefaction hazard mapping of Laoag City, Northern Philippines. Natural Hazards, 43 (3). pp. 415-430.

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During the 1990 Luzon earthquake (Ms 7.8), the central part of Luzon Island, Philippines suffered much from liquefaction-related processes. Examination of inventories shows that the affected areas lie on certain geological environments that are characteristically vulnerable to liquefaction. Based on this local experience and the findings of earlier workers correlating geological setting with liquefaction susceptibility, a first-level map of liquefaction hazard for Laoag City, Northern Philippines, was produced. Distinct micro-geomorphological units were identified within the mainly fluvio-deltaic setting of the study area. The liquefaction susceptibility of each unit was then ranked as high, moderate, low or non-liquefiable, taking also the geomorphological evolution of the area into account. The geomorphological model of the fluvio-deltaic basin was tested against the results of the georesistivity survey carried out in this study. Moreover, compatibility of the liquefaction susceptibility map with historical liquefaction records supported the validity of the proposed ranking. The study showed that microzonation based on geomorphological criteria is indeed very useful in less-developed countries like the Philippines, where funds for a more rigorous determination of liquefaction potential are limited and not always available.

Item Type: Article
Additional Information: The authors wish to thank Alvin Fernando, Jerry Salvador, and Art Daag for the assistance in image interpretation, and Abraham Gatdula and Jojo de Guzman for the georesistivity survey. This study is part of the joint project of the University of Hong Kong, Mines and Geosciences Bureau (MGB), and the Philippine Institute of Volcanology and Seismology (PHIVOLCS) titled ‘‘Liquefaction Potential Assessment of Laoag City, Northern Philippines. ’’ The study was funded by Dr. Stephen Hui Trust Fund of The University of Hong Kong.
Uncontrolled Keywords: Liquefaction - Hazard mapping - Susceptibility ranking - Microzonation - Geomorphological criteria - Laoag City - Philippines
Subjects: Atmosperic Science > Climatology
Depositing User: Mr Siva Shankar
Date Deposited: 22 Feb 2012 09:33
Last Modified: 22 Feb 2012 09:33
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