Tinukoy ng Philippine Institute of Volcanology and Seismology (PHIVOLCS) ang pitompu't-limang (75) barangay sa loob at labas ng Metro Manila na dinadaanan ng East at West Valley fault systems. Pinapayuhan din ng PHIVOLCS ang mga naninirahan o nago-opisina sa mga barangay na ito na suriin kung gaano kalapit sa fault line ang kanilang mga establisyimento.
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