Figure 2. A) Map showing the locations of the east and west Marikina Valley faults, which strike through the metropolitan Manila area (Metro Manila, light shading) of central Luzon. The Maislap trench site is on a northeast-trending splay of the west Marikina Valley fault in the northern part of the Marikina Valley. B) Map of the trench site, showing fault traces and trench and stream exposures.