According to Phivolcs, the “Big One” could kill thousands of people. The West Valley Fault, which traverses portions of Quezon.

The 100-kilometer fault traverses parts of Bulacan through Quezon City, Marikina, Makati, Pasig, Taguig and Muntinlupa in Metro Manila; San Pedro, Biñan, Sta. Rosa, Cabuyao and Calamba in Laguna; and Carmona, General Mariano Alvarez and Silang in Cavite.
Roughly every 400 years, the West Valley Fault moves generating a huge tremor like the major earthquake happened 357 years ago, Solidum said. In August 20, 1658, a major earthquake with intensity 6 killed hundreds of people devastating the areas along the West Valley Fault from Sta. Cruz, Manila to the nearby provinces of South Luzon.
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