The city of Valenzuela in the Philippines has provided several preparedness plans and contingency measures in anticipation of the 7.2-magnitude earthquake, dubbed as the "Big One". In studying the movements along the country's Valley Fault System, the said plans and measures were not accomplished. The consideration of the soil's potential to liquefy was not included-which is significant in providing hazard maps for the city. The researchers assessed the soil in Valenzuela using soil investigation reports done from 2008 to 2017. The geotechnical properties were utilized to calculate liquefaction potential using Idriss and Boulanger's Semi-empirical Method for Factor of Safety against Liquefaction and the formula from Iwasaki, et al. for Liquefaction Potential Index. Liquefaction potential maps were produced corresponding to moment magnitudes 6, 7, and 8. Based on the results, 67.65% of the city has the potential and probability to liquefy at magnitudes 6 and 7, while 70.59% for magnitude 8. On the same hand, about 32.35% of the city is the least susceptible to liquefaction during earthquake magnitudes 6 and 7, while 29.41% for magnitude 8. It is therefore concluded that the majority of the soils in Valenzuela is highly susceptible to liquefaction.
