Interest Seismic Notification 18 May 2015 | ||
Marikina valley fault system
The Marikina Valley Fault System, also known as the Valley Fault System (VFS), is a dominantly dextral strike-slip 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 Cavite and Laguna that ends in Canlubang.
Contents
- Marikina valley fault system
- Map of Valley Fault System Makati Metro Manila Philippines
- Fault segments
- Threat to Manila
- References
Map of Valley Fault System, Makati, Metro Manila, Philippines
Fault segments
The fault contains two major segments, known as West Valley Fault (WVF) and East Valley Fault (EVF).
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 of 100 kilometers when the fault moves. and moves in a dominantly dextral strike-slip motion. The West Fault is capable of producing large scale earthquakes on its active phases with a magnitude of 7 or higher.
The eastern segment, known as East Valley Fault (EVF) moves in an oblique dextral motion within 10 kilometers.
Threat to Manila
Based on kinematic block models that utilize GPS, actual fault geometry, and earthquake focal mechanisms, the West segment of the Marikina Fault was resolved to be almost fully locked, meaning it is currently accumulating and loading elastic strain, at the rate of 10 to 12 mm/yr. The fault possesses a threat of a large scale earthquake with an estimated magnitude between 6–7 and as high as 7.6 within the Manila Metropolitan Area with death toll predicted to be as high as 35,000 and some 120,000 or higher injured and more than three million needed to be evacuated.