valley fault system
Earthquakes are quite common in the Philippines. They are mostly harmless but there is a a certain risk for stronger earthquakes, so you should be prepared. Here is the Megacitizens Safety Guide for Earthquakes, including links to the Valley Fault System Atlas.
The Office of Civil Defense will conduct a metro-wide earthquake drill on Thursday, July 30th after holding a nationwide earthquake exercise on July 23rd. The July 30th drill will be held from 10:30 am to 11:30 am.