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Multiple large earthquakes in the past 1500 years on a fault in metropolitan Manila, the Philippines

Bulletin of the Seismological Society of America

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Abstract

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.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Multiple large earthquakes in the past 1500 years on a fault in metropolitan Manila, the Philippines
Series title:
Bulletin of the Seismological Society of America
Volume
90
Issue:
1
Year Published:
2000
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Bulletin of the Seismological Society of America
First page:
73
Last page:
85