Tectonic geomorphology and paleoseismology of the Surigao segment of the Philippine fault in northeastern Mindanao Island, Philippines PDF Print
Saturday, 11 February 2017 21:25

The Philippine fault is a major strike-slip fault that traverses the entire Philippine archipelago for > 1250 km and has generated at least 10 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


Link to the full paper:

PHIVOLCS Conducts REDAS Training for Baguio City PDF Print
Wednesday, 08 February 2017 00:00

PHIVOLCS conducted a six-day training entitled "Mainstreaming of Disaster Risk Reduction into the Local Development Planning Process, Contingency Planning, and Emergency Preparedness through the Provision and Use of the REDAS Software" for Baguio City last December 5 - 10, 2016. The training was held at Prime Hotel, Baguio City. The goal of the training was to provide and familiarize the participants with the capability of the REDAS Software, especially the modules which are designed to be used for risk assessment.

There was a total of 38 participants during the training. Thirty (30) of them came from the city offices of Baguio City, 1 from Saint Louis University, 2 from the University of Baguio, 2 from University of the Cordilleras, 2 from BENECO and 1 from NEDA - CAR. The participants were provided with REDAS version 2.9b. A total of 39 REDAS software license keys was issued during the said event.

The first day of the training covered the introduction of PHIVOLCS, installation and orientation on the basic features of REDAS Software and basic map reading. The succeeding days of the training covered lectures ranging from Building Risk Database, Earthquake Risk Assessment, the use of SQLite as a Relational and Spatial Database System, and Seismic Hazard Assessment. The new modules for Severe Wind Risk (SWIFT) and Flood Risk (FLOAT) were also incorporated in the training. In addition, software such as Exposure Database Module (EDM), SQLite and Quantum GIS, and the EDM and MyTracks in Android devices were also installed during the training. The participants were taught how to use the EDM in Android Devices for conducting building survey. Different earthquake risk assessment methodologies and computations were also taught in the training, as well as identifying building earthquake damage levels for conducting earthquake risk assessment.

Speakers and facilitators during the training were Maria Leonila P. Bautista, Angelito G. Lanuza, Rhommel N. Grutas, Robjunelieaaa Lim, Emmanuelle Mitiam, Mary Ann T. Montion, Anne Lorraine T. Delos Santos, Ruffy R. Villanueva, Dave Andrei V. Rivera, Greggue Ann Lyza T. Castro, Hilario Esperanza (PAGASA), Clint Drexel M. Ongue, and Joana C. Umbaña.

Monday, 06 February 2017 10:02
Fissures along the highway just north of Jimalalud Bridge.

The Philippine Institute of Volcanology and Seismology – Department of Science and Technology (PHIVOLCS-DOST) commemorates the 2012 Negros Oriental Earthquake on its 5th year.

A magnitude 6.9 earthquake shook the islands of Negros, Cebu, and nearby islands of Western Visayas region at 11:49 A.M. on February 6, 2012. The earthquake was generated by a thrust fault movement with the epicenter located in Tayasan, Negros Oriental. An Intensity VIII (very destructive) was felt in Tayasan, Vallehermoso, Jimalalud, La Libertad, and Guihulngan, Negros Oriental.

The estimated total cost of damage to infrastructure was Php 383,059,000.00.00. A total of 51 dead and 112 injured while 62 were missing from the landslide in Solongon, La Libertad and Planas, Guihulngan (NDRRMC SitRep No. 22, 20 Feb 2012).


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