Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Valley Fault System and formerly as the Marikina Valley Fault System is a group of dextral strike-slip fault which extends from San Mateo, Rizal to Taguig City on the south; running through the cities of Makati, Marikina, Parañaque, Pasig and Taguig. The fault possesses a threat of a large scale earthquake with a magnitude of 7 or higher 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.