Philippine Fault Article: Tsutsumi, H. and Perez, J.S., Large-scale active fault map of the Philippine fault based on aerial photograph interpretation
Friday, 07 July 2017 00:43


The Philippine fault is a ~1250-km-long, left-lateral strike-slip fault extending NNW parallel to the Philippine archipelago. This fault has been very active in the past 200 years with several destructive earthquakes accompanied by surface rupture. However, there was no large-scale map of the Philippine fault, which is essential for mitigating seismic hazard from future earthquakes. We mapped the surface trace of the Philippine fault on 1:50000-scale topographic maps based mainly on interpretation of ~1:30000-scale aerial photographs. We then compiled these fault trace data on a Geographic Information System to produce the first digital active fault map of the Philippine fault. These 1:50000-scale active fault maps are available from the website of Philippine Institute of Volcanology and Seismology (PHIVOLCS). These maps reveal that there are notable along-strike variations in fault trace geometry and magnitudes of historical seismicity of the Philippine fault. The Philippine fault in central Luzon and Mindanao Islands are well segmented and produced large (M≥7) earthquakes. In contrast, the fault in Masbate and Leyte Islands are more continuous and produced only moderate earthquakes in the past 400 years. There are geomorphic and geodetic evidence of aseismic creeping on the Philippine fault in northern and central Leyte. These observations suggest that the Philippine fault may be comparable to the San Andreas fault in that both of the faults are composed of locked, transition and creeping segments as previously suggested.

Full paper: 

Tsutsumi, H. and Perez, J.S., 2013. Large-scaleactive fault map of the Philippine fault based on aerial photograph and interpretation. Active Fault Research, 39, 29-37.

Geologist Jeffrey Perez lauded as an Outstanding Young Scientist
Thursday, 06 July 2017 15:36

Jeffrey Perez, Supervising Science Research Specialist of the Department of Science and Technology-Philippine Institute of Volcanology and Seismology (DOST-PHIVOLCS), is hailed as one of the Outstanding Young Scientists by the National Academy of Science and Technology (NAST) for his contributions in the field of geology.

NAST, the highest recognition and advisory body to the government and science community on matters related to science and technology, has recognized Perez for his research findings that provided better understanding of the fault distribution, segmentation, earthquake generation potential, and history of surface-rupturing earthquakes along the different segments of the Philippine fault in eastern Mindanao. He led the active faults and paleoseismic studies along the Philippine fault, and was also part of the team that mapped and conducted paleoseismic studies along the Valley Fault System that traverses Greater Metro Manila Area and other active faults in the Philippines.

Their work has updated the active faults map of the Philippines, which is extensively used in seismic hazard assessment by different stakeholders for land-use and disaster risk reduction mitigation plans. He also effectively communicates geohazard information and disaster risk reduction researches to various stakeholders through engaging lectures and seminars for communities to be pro-active in earthquake and tsunami preparedness.

In addition, Perez received various awards such as the 2015 DOST International Publication Award, 2016, 2015 and 2011 PHIVOLCS Research Publication Award and 2007 PHIVOLCS Model Employee (Technical) Award.

The Outstanding Young Scientist Award will be presented to Jeffrey Perez on July 11, 2017 at World Trade Center, Pasay City and on July 13, 2017 during the National Academy of Science and Technology (NAST) - Annual Scientific Meeting on at Manila Hotel.

Thursday, 29 June 2017 18:41

At the sound of the alarm, employees of the Department of Science and Technology - Philippine Institute of Volcanology and Seismology (DOST-PHIVOLCS) performed the Duck, Cover, and Hold technique and evacuated the building as they participate in the 2nd quarter Nationwide Simultaneous Earthquake Drill (NSED).

NSED is a quarterly activity organized by the Office of Civil Defense (OCD) that seeks to heighten public awareness and to educate the public on the importance of preparedness against earthquake hazards.

The 2nd quarter NSED ceremonial venue was held in Davao City at Bolton Street along University of Mindanao on June 29, 2017, Thursday at 2:00 PM. DOST Usec. Renato Solidum, Department of National Defense (DND) Usec. Ricardo Jalad, and Davao City Administrator Zulieka Lopez led the ceremonial pressing of the button to indicate the start of the earthquake drill. The drill in Davao City simulated a Magnitude 7.0 earthquake generated by the Central Davao Fault Zone (CDFZ) with the Intensity of PHIVOLCS Earthquake Intensity Scale (PEIS) VIII [Very Destructive]. Barangay residents, students, and owners of business establishments participated in the community-based drill. Different scenarios were performed to showcase response during a strong destructive earthquake.

As the agency mandated to monitor and study earthquakes, DOST-PHIVOLCS pushes for the continued promotion of earthquake awareness and preparedness since it introduced the conduct of earthquake drills in schools way back 2002.

Philippines is a seismically active country with approximately 90 destructive earthquakes and 40 tsunamis recorded in the past 400 years. Strong earthquakes may result to earthquake hazards such as ground shaking, ground rupture, liquefaction, tsunamis, and earthquake-induced landslide. Awareness and preparedness will increase our chances against natural hazards and disasters.

Tuesday, 30 May 2017 12:54

Mati City, Davao Oriental, Philippines, 30 May 2017

The Philippine Institute of Volcanology and Seismology – Department of Science and Technology (PHIVOLCS-DOST) is conducting a series of 1-day seminar-workshops on Earthquake Awareness and Preparedness for Local Government Units (LGUs) and Barangay Officials of Davao Oriental. The seminar-workshop will be held on May 30, 31, and June 1, 2017 at Honey’s Hotel and Restaurant, Mati City.

The province of Davao Oriental was identified as an earthquake and tsunami prone area. It is transected and bounded by active earthquake generators such as the Philippine Fault and the Philippine Trench. The tsunami threat posed to the eastern Philippine archipelago includes both local and distant tsunamis. Large-magnitude earthquakes that also generated a tsunami have occurred in the region.

The one-day seminar-workshop aims to strengthen the province’s awareness about earthquake and tsunami, as well as to help them prepare in case such natural hazards occur in the region. LGUs and Barangay Officials’ role in correct information dissemination will be discussed in the seminar-workshop.

PHIVOLCS, thru the Provincial Government of Davao Oriental, invited participants from the municipalities of Boston, Cateel, Baganga, and Caraga to attend on May 30. Officials from the municipalities of Manay, Tarragona, BanayBanay, and Lupon and municipalities of San Isidro, Governor Generoso, and Mati City are expected to attend the seminar on May 31 and June 1, 2017, respectively.

In addition, PHIVOLCS will conduct a press conference, PHIVOLCS Infosentro, to give update regarding the recent earthquakes at Honey’s Restaurant on May 31, 2017, and on June 1, Usec. Renato Solidum will be the guest speaker in “Kapihan sa Apo View” at Apo View Hotel, Davao City.

Last year, PHIVOLCS conducted a “Teachers’ Training on Communicating Earthquake and Tsunami Hazards” for elementary teachers from the Division of Mati and District of Manay, Division of Davao Oriental last October 12 and 13, 2016 at Honey’s Hotel and Restaurant, Mati City, Davao Oriental.


[Download Press Release Here]



For information about the event, please contact:

Dr. Renato U. Solidum, Jr.

Undersecretary for Disaster Risk Reduction and Climate Change, DOST

and Officer-in-Charge, PHIVOLCS

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