[2] The West Valley Fault segment extends from Doña Remedios Trinidad to Calamba and is 129.47 kilometers (80.45 mi) long.

[1] The West Valley Fault is capable of producing large-scale earthquakes during its active phases with a magnitude of 7 or higher.

[3] The eastern segment, known as the East Valley Fault (EVF), moves in an oblique dextral motion.

[1] Based on kinematic block models that utilize GPS, actual fault geometry, and earthquake focal mechanisms, the western segment of the Marikina Valley fault system was resolved to be almost fully locked, meaning it is currently accumulating and loading elastic strain at a rate of 10 to 12 mm/yr.

[3] There are 99 private villages and subdivisions inside 80 barangays traversed directly by the fault,[8] and it endangers 6,331 buildings in a span of 2,964.10 square kilometers (1,144.45 sq mi), where the majority are houses with 19 schools included in the list.