Marikina Valley Fault System
The Marikina Valley Fault System, also known as the Valley Fault System (VFS), is a dominantly dextral strike-slip[1] fault system in Luzon, Philippines. It extends from Dingalan, Aurora in the north and runs through the provinces of Nueva Ecija, Bulacan and Rizal, and the Metro Manila cities of Quezon, Marikina, Pasig, Makati, Parañaque, Taguig and Muntinlupa, and the provinces of Laguna and Cavite that ends in Tagaytay.[1]
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Threat to Manila
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The fault possesses a threat of a large scale earthquake with a magnitude of 7 or higher [2] 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
The fault contains two major segments, known as West Valley Fault (WVF) and East Valley Fault (EVF).
West segment
The west segment, known as the West Valley Fault (WVF) is one of the two major 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
The eastern segment, known as East Valley Fault (EVF) moves in an oblique dextral motion.[1]
References
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<references />, or <references group="..." />External links
- Valley Fault System (VFS): Marikana Quadrangle – Philippine Institute of Volcanology and Seismology
- High resolution West Valley Fault maps launched - Rappler
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