The main fault line in Greater Maila is the Marikina Valley Fault line which lies just northeast of Manila and traverses Marikina, Pasig going to Muntinlupa down to the south. You may find this link useful for it's small, but helpful maps:
earthquake.usgs.gov You can also see a map of the fault line here:
earthquake.usgs.gov You can also see a map of the fault line here: