The first 14C-based paleoseismic study of an active fault in the Philippines shows that a right-lateral fault on the northeast edge of metropolitan Manila poses a greater seismic hazard than previously thought. Faulted hillslope colluvium, stream-channel alluvium, and debris-flow deposits exposed in trenches across the northern part of the west Marikina Valley fault record two or three surface-faulting events. Three eroded, clay-rich soil B horizons suggest thousands of years between surface faulting events, whereas 14C ages on detrital charcoal constrain the entire stratigraphic sequence to the past 1300-1700 years. We rely on the 14C ages to infer faulting recurrence of hundreds rather than thousands of years. Minimal soil development and modern 14C ages from colluvium overlying a faulted debris-flow deposit in a nearby stream exposure point to a historic age for a probable third or fourth (most recent) faulting event.
CITATION STYLE
Nelson, A. R., Personius, S. F., Rimando, R. E., Punongbayan, R. S., Tuñgol, N., Mirabueno, H., & Rasdas, A. (2000). Multiple large earthquakes in the past 1500 years on a fault in metropolitan Manila, the Philippines. Bulletin of the Seismological Society of America, 90(1), 73–85. https://doi.org/10.1785/0119990002
Mendeley helps you to discover research relevant for your work.