The Valley Fault System Atlas

PHIVOLCS and GMA News Online have downloadable copy of The Valley Fault System Atlas on scribd . The higher-resolution copy is available for free download from the PHIVOLCS website. There is also a set of downloadable PDF files at The National Disaster Risk Reduction and Management Council website. Continue Reading

Check your flood exposure using online flood hazard maps

I've recently discovered some flood hazard maps at, a project by members of the Volcano-Tectonics Laboratory of the National Institute of Geological Sciences. According to their website:
"These hazard maps are indicative inundation maps for large flood events and useful only for knowing where not to be during extremely heavy rainfall. For local governments, these flood hazard maps can be used for localized emergency response (i.e. evacuation and access routes, road closures, siting of key rescue facilities) and for urban planning."
Take a look at the citizen reports at
Image of flood hazard map by
View the Flood Reporting & Mapping tool.
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Do you live in one of Manila’s flood-prone areas?

The Metropolitan Manila Development Authority has identified the following flood-prone areas within Metro Manila:
  • Along H. Lopez Boulevard
  • Along R-10
  • Anda Circle
  • Taft Avenue corner Quirino Avenue
  • Along Abad Santos
  • Along G. Araneta Avenue
  • Mother Ignacia corner Bohol Avenue
  • Timog corner Scout Tobias
  • Along General Kalentong St.
  • P.Sanchez St. corner Fabella St.
  • Martinez St. corner F. Ortigas St.
  • Boni Avenue corner F. Ortigas St.
  • Edsa corner Connecticut
  • Chino Roces corner Edsa
  • Along Gil Puyat
  • Quirino Ave. Plaza
  • Airport Road and Naia Road
  • E. Rodriguez Jr. Avenenue corner Eagle Avenue
  • East Service road-Nichols Interchange
  • East Service road-DBM Avenue
  • Along C.P Garcia Avenue
  • Along Manuel L.Quezon Ave.
  • Along Commonwealth Ave
  • Along Tandang Sora and Ortigas Avenue in front of La Salle St.

I've started mapping the areas on Google Maps. The markings simply highlight the approximate points identified. They do not correspond to the actual area that's expected to flood as this information was not given.
View Manila flood areas in a larger map This is a collaborative project so if you'd like to get involved, please contact me and I'll add you as a collaborator. Continue Reading

Earthquake risk to Metro Manila

According to the 2004 Metro Manila Earthquake Impact Reduction Study, the West Valley Fault System is entering its active phases which may result in an earthquake of at least magnitude 7. Of the all the cities in Metro Manila, seven are highlighted as being most at risk of heavy damage and casualties in the event of a massive earthquake. These are:
  • Marikina
  • Quezon City
  • Pasig
  • Makati
  • Pateros
  • Taguig
  • Muntinlupa
Since governmental disaster management systems will be insufficient to cope with the disaster, it's important that each of us take steps now to reduce its impact. The maps below will help you assess how you could be affected should Manila be hit by a large earthquake. If you live or work in an area highlighted as having a higher risk, it would be wise to take extra precautions.

GMA News fault line map has produced an interactive map showing the Valley Fault System together with nearby landmarks. Hovering your mouse over the red fault line will highlight the landmarks within two kilometers of the fault.

MMIERS Risk assessment maps

The widely referenced Metro Manila Earthquake Impact Reduction Study (MMEIRS) maps out risk assessments for both human loss risk and damage to residential buildings. Map showing human loss risk Map showing residential building damage risk Images source: MMIERS presentation downloaded from

Active faults in the Philippines on Google Maps

Edited 22 Oct 2013: Google map added Zoom out and scroll to find your province. Zoom back in for your local area.
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