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surface rupturing earthquakes for the past 200 years. 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 1300 years.

Active tectonics; Philippine fault; Tectonic geomorphology; Paleoseismology; Historical earthquake; 1879 Surigao earthquake


  • Jeffrey S. Perez, , Philippine Institute of Volcanology and Seismology, Department of Science and Technology, Quezon City 1101, Philippines
  • Hiroyuki TsutsumiDepartment of Geophysics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan

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