If you check the West Valley Fault map, you'll see that homes and office buildings were built (1) on top off; (2) around the; and (3) near the fault itself in at least ⅔ of the 100-km fault line.
In addition and as an example, from where I live—Makati-Pasay boundary—we're only 6-km away from the nearest part of it. It isn't a safe area not only because we're only 6-km away, but also because we are always subjected to liquefaction, so are the City of Manila and the Western part of Parañaque and Las Piñas cities. (The government provided an earthquake hazard map 5–7 years ago, you can check it.)
Let's face it, practically nowhere in the National Capital Region / Metro Manila is safe when, not if, the West Valley Fault moves.
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