Philippine Standard Time

The PHIVOLCS Open-File Report contains results of various research and development projects. The list shows the downloadable open-file reports:


1.Interseismic Deformation and Horizontal Displacements Associated with the February 15, 2003 Masbate Earthquake

Teresito Bacolcol, Agnes Aguilar, Robinson Jorgio, and Ronald de la Cruz


2. Interseismic Velocities and GPS Motions Associated with 6 July 2017 M6.5 Philippine Fault (Leyte Segment) Earthquake

Teresito Bacolcol, Genesis Sapla, Alfie Pelicano, Artemio Luis Jr., Robinson Jorgio, Bryan Marfito, Marion Paras, Zachary Ragadio, Alberto Baloto and Oriel Absin


3. Volcanic Hazards Community Preparedness: Barangay Pula, Kanlaon Volcano, Philippines

Ma. Mylene Martinez-Villegas, Lucille Rose C. Del Monte, Ruben C. Lamela, Benjamin P. Tanatan, Nelson A. Mondia and Joel R. Arellano


4. Eyewitness Accounts Related to the Tsunami Associated with the October 15, 2013 (Mw7.2) North Bohol Fault Earthquake
Maria Leonila P. Bautista, Johnlery P. Deximo, Bartolome C. Bautista, Nolan Evangelista, Angelito G. Lanuza, Janila B. Deocampo, Ishmael C. Narag and Renato U. Solidum, Jr.


5. Mapping of the Surface Rupture of the North Bohol Fault Bohol Island, Philippines

Bacolcol, Teresito C.1, Cahulogan, Mabelline T. 1 , Punongbayan, Baby Jane B. 1, Papiona, Kathleen L. 1, Perez, Jeffrey S.1, Abigania, Ma. Isabel T. 1, , Pogay, Cathy D. 1, Buhay, Daniel Jose L. 1, Rivera, Danikko John V. 1, Lim, Robjunileaaa B. 1, Bariso, Ericson B. 1, Decierdo, Princess D. 1, Villamil, Charmaine V. 1, Hernandez, Vilma C. 1, Evangelista, Nolan C. 1, Torrevillas, Lennie 1, Solidum, Renato Jr. U. 1, Inoue, Hiroshi 2 and Nakata, Takashi3

6. Hazards Assessment Related to Liquefaction, Tsunami, Flood, Earthquake- and Rain-induced Landslides, and Lahar of Cities in the Philippines

Philippine Institute of Volcanology and Seismology (PHIVOLCS)


7. Interseismic Surficial Velocities and GPS Motions Associated with the October 2019 Cotabato Earthquake Series

Teresito Bacolcol, Alfie Pelicano, Genesis Sapla, Zachary Albert Ragadio, Mary Lizeth Anero, Cassandra Joy Cabigan, and Alberto Baloto


8. Report on the Results of Information, Education and Communication (IEC) Conducted in Carmen, North Cotabato and Vicinity and Results of Preliminary Surveys on the Effects of the 01 June 2013 Magnitude 5.7 Carmen, North Cotabato Earthquake

Jeffrey S. Perez, Mabelline T. Cahulogan, Desiderio P. Cabanlit, Hermes A. Daquipa, Rainier G. Amilbahar and Princess Dianne Kris S. Decierdo


9. Nationwide Hazards Assessment Related to Ground Rupture, Liquefaction, Tsunami, Earthquake-induced Landslide, Rain-induced Landslide, Flood, and Proximity to Active Volcanoes in the Philippines

Cahulogan, M.T., Tabuzo, J.H.B., Aquino, Y.P.M., Mercado, N.J. L., Buhay, DJL, Balboa, JHN


10. Understanding the December 2023 Earthquakes in Eastern Mindanao, Philippines: What Happened and Why It Matters
Deo Carlo E. Llamas, Jeffrey S. Perez, Crystel Jade Legaspi, Jonard Jhon S. Acid and John Patrick S. Naing


11. Report of Investigation for the 01 February 2023 Mw6.0 Davao De Oro Earthquake
Jeffrey S. Perez, Crystel Jade M. Legaspi, Roland Joseph B. de Leon, Ryan Christian C. Constantino, Marc Marion Y. Quimson, and Jan Robey D.C. Salazar


12. 1995-1999 Temperature vs. Depth Measurement of the 1991 Pinatubo Pyroclastic Flow Deposits: An Evaluation of the Pinatubo Thermal Surveys Project

Ma. Antonia V. Bornas and Ma. Mylene L. Martinez-Villegas
Ma. Antonia V. Bornas, Arturo S. Daag, Eduardo P. Laguerta, and D.G. Garcia
14. Report of Investigation: Lahar and Flood Hazards Mapping and Assessment after Super Typhoon Reming and Typhoon Seniang

Perla J. Delos Reyes, Ma. Antonia V. Bornas, Ma. Carmencita B. Arpa, Arturo S. Daag, Raymond Patrick R. Maximo, Ma. Hannah T. Mirabueno, Jeffrey S. Perez, Arnel T. Aquino, Eduardo P. Laguerta, and Renato U. Solidum Jr.


15. Report of Investigation and Assessment of Current Lahar Hazards Conditions around Bulusan Volcano, Sorsogon Province

Ma. Antonia V. Bornas, Perla J. Delos Reyes, Raymond Patrick R. Maximo, and Bella S. Tubianosa


16. Conditions for Natural Breaching of the Maraunot Conditions for Natural Breaching of the Maraunot Notch and Catastrophic Drainage of Pinatubo Crater
Ma. Antonia V. Bornas, Ma. Lynn Paladio-Melosantos, and Julianita S. Rañola