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

M. Beroya and A. Aydin ()

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2007, vol. 43, issue 3, 415-430

Abstract: During the 1990 Luzon earthquake (M s 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. Copyright Springer Science+Business Media B.V. 2007

Keywords: Liquefaction; Hazard mapping; Susceptibility ranking; Microzonation; Geomorphological criteria; Laoag City; Philippines (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1007/s11069-007-9138-x

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