| 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. |
| Genre: | Article |
| ProdID: | 70022829 |
| Citation Author: | Nelson, A. R.; Personius, S. F.; Rimando, R. E.; Punongbayan, R. S.; Tungol, N.; Mirabueno, H.; Rasdas, A. |
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| Citation End Page: | 85 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Bulletin of the Seismological Society of America |
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| Citation Number Of Pages: | 13 |
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| Citation Search Results Text: | Multiple large earthquakes in the past 1500 years on a fault in metropolitan Manila, the Philippines; 2000; Article; Journal; Bulletin of the Seismological Society of America; Nelson, A. R.; Personius, S. F.; Rimando, R. E.; Punongbayan, R. S.; Tungol, N.; Mirabueno, H.; Rasdas, A. |
| Citation Start Page: | 73 |
| Citation Volume: | 90 |
| Citation Year: | 2000 |
| Type: | citation/reference |
| Text: | Multiple large earthquakes in the past 1500 years on a fault in metropolitan Manila, the Philippines; 2000; Article; Journal; Bulletin of the Seismological Society of America; Nelson, A. R.; Personius, S. F.; Rimando, R. E.; Punongbayan, R. S.; Tungol, N.; Mirabueno, H.; Rasdas, A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 2000 00:00 -0600 |
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