Marikina Valley Fault System

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This article is about the fault geographically located at the Philippines. For the series of faults located at northeastern Nevada, see Independence Valley fault system.
An illustration of the Philippine Fault System in Northern Central Philippines. Included in the illustration was the Valley Fault System which runs through the western Metropolitan Manila.

The Valley Fault System and formerly as the Marikina Valley Fault System is a group of dextral strike-slip[1] fault which extends from San Mateo, Rizal to Taguig City on the south; running through the cities of Makati, Marikina, Parañaque, Pasig and Taguig.[2]

Threat to Manila[edit]

The fault possesses a threat of a large scale earthquake with a magnitude of 7 or higher[3][4] within the Manila Metropolitan Area with death toll predicted to be as high as 35,000[3][4] and some 120,000 or higher[3] injured[4] and more than three million needed to be evacuated.[5]

Fault segments[edit]

The fault contains two segments, known as West Valley Fault and East Valley Fault both located in the city of Marikina.

West segment[edit]

The west segment, known as the Western Marikina Fault was one of the two fault segments of the Valley Fault System which runs through the cities of Marikina, Pasig and Muntinlupa[5] and moves in a dominantly dextral strike-slip motion.[1] The West Fault is capable of producing large scale earthquakes on its active phases with a magnitude of 7 or higher.[5]

East segment[edit]

The eastern segment, known as Eastern Marikina Fault moves in an oblique dextral motion.[1]


  1. ^ a b c Rimando, Rolly; L.K. Knuepfer, Peter (2004). "Neotectonics of the Marikina Valley fault system (MVFS) and tectonic framework of structures in northern and central Luzon, Philippines". Tectonophysics 415 (1-4). Elsevier. pp. 17–38. 
  2. ^ "marikina valley fault line". Retrieved January 16, 2010. Are we ready for the Big One? 
  3. ^ a b c Ubac, Michael (20 June 2009). "UN to Metro Manila: Ready for Big One?". Manila, Philippines: Inquirer. Retrieved 2010-01-30. Is Metro Manila prepared for the Big One? 
  4. ^ a b c "Big earthquake in Marikina Valley fault line?". Retrieved 2010-01-30. The United Nations is advising the Philippines to be ready for an upcoming big earthquake. A quake with a magnitude of 7 or higher on the Richter scale is sure to hit Metro Manila, they say, but the bigger question is when exactly this will happen. 
  5. ^ a b c "‘Big One’ Is Possible But Metro Is Unprepared". Quezon City, Philippines: Bulatlat. 14 August 2004. Retrieved 2010-02-03. If a major earthquake were to hit Metro Manila today, the devastation would be so big even disaster response authorities cannot simply cope with it. And it even looks like disaster preparedness occupies a low priority among officials down to the municipal level. 

External links[edit]