Tectonic geomorphology and paleoseismology of the Surigao segment of the Philippine fault in northeastern Mindanao Island, Philippines

The Philippine fault is a major strike-slip fault that traverses the entire Philippine archipelago for more than 1250km and has generated at least 10 surface rupturing earthquakes for the past 200years. To better understand its characteristics, we have conducted review of historical earthquakes, tec...

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Bibliographic Details
Published in:Tectonophysics 2017-03, Vol.699, p.244-257
Main Authors: Perez, Jeffrey S., Tsutsumi, Hiroyuki
Format: Article
Language:English
Subjects:
1879 Surigao earthquake
Active tectonics
Aerial photographs
Aerial photography
Archipelagoes
Earthquakes
Fault lines
Geomorphology
Historical earthquake
Paleogeology
Recurrence interval
Rupturing
Seismic activity
Seismology
Slip rate
Strike-slip fault
Tectonic geomorphology
Trenching
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Summary:The Philippine fault is a major strike-slip fault that traverses the entire Philippine archipelago for more than 1250km and has generated at least 10 surface rupturing earthquakes for the past 200years. To better understand its characteristics, we have conducted review of historical earthquakes, tectonic geomorphic mapping and paleoseismic trenching along the 100-km-long Surigao segment, the northernmost segment of the Philippine fault on Mindanao Island. We mapped the Surigao fault based on aerial photographs and identification of well-defined geomorphic features in the field. Combining this with historical accounts and paleoseismic trenching, we have identified and mapped the surface rupture of the 1879 Mw 7.4 Surigao earthquake. Paleoseismic trenching conducted at two sites also led us to identify evidence of at least four surface-rupturing earthquakes including the 1879 event during the past 1300years. •The first paleoseismic and active tectonic studys conducted along the Philipine fault in Mindanao Island.•Surface rupture of the 1879 Surigao earthquake based on historical accounts, aerial photos and tectonic geomorphic mapping.•The first detailed geomorphic mapping conducted along the Surigao segment of the Philippine fault.•Evidence for the four surface-rupturing earthquakes for the past 1300 years.•High slip rate and recurrence interval of this segment is comparable to other segments of the Philippine fault and other major faults of the world.
ISSN:0040-1951
1879-3266
DOI:10.1016/j.tecto.2017.02.001