earthquake research paper pdf philippines

Earthquake activities in the Philippines Islands and the adjacent areas

• Published: 29 September 2016
• Volume 20 , pages 877–889, ( 2016 )

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• Santi Pailoplee 1 &
• Natchana Boonchaluay 1  

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This study focused on the seismic activities in the Philippines Islands and the adjacent areas where the inter- and intra-plate seismic sources are prevalent. To access this, the frequency-magnitude distribution model was employed with the completeness seismicity data. Then, the possible maximum magnitude, return period and probability of earthquake occurrence, including the prospective areas of upcoming earthquakes, were evaluated. The results indicated that eastern Taiwan is among the most seismic-prone areas. The most probable largest magnitude of earthquakes was estimated to be up to 8.0 M w in a time period of 50 years, giving return periods of <1, 2–4, 5–20 and 20–40 years for earthquakes with a M w of 5.0, 6.0, 7.0 and 8.0, respectively. Meanwhile, in the areas of Davao and eastern Manado, where the group of Halmahera, Philippines and Sangihe Double Subduction Zones are delineated (HSZ, PSZ and SSZ, respectively), maximum earthquakes of 6.8–7.1 M w are possible in a 5–10 year period. For the northern Minahassa and eastern Sulu Trenches (MST and SLT), which were defined as medium hazard areas, the return periods were calculated at ~100–200 years for an earthquake magnitude of 7.0–8.0 M w . According to the limits of the recorded earthquake events, the Palawan, Sulu Archipelago and Sulu Trenches (PWT, SAT and SLT, respectively) are classified as aseismic source zones. For earthquake forecasting, six locations along the Manila Trench (MLT), HSZ, PSZ and SAT are proposed as the areas that have a high probability of generating a major earthquake in the near future. Geographically, the most prospective areas are located near major cities, such as Taipei, Manila, Davao and Manado. Thus, there is a compelling need to develop effective mitigation strategies for both tsunami and earthquake hazards.

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Morphology of Earth Surface and Advanced Geohazards in Southeast Asia Research Unit (MESA RU), Department of Geology, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand

Santi Pailoplee & Natchana Boonchaluay

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Pailoplee, S., Boonchaluay, N. Earthquake activities in the Philippines Islands and the adjacent areas. Geosci J 20 , 877–889 (2016). https://doi.org/10.1007/s12303-016-0017-x

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Received : 01 December 2014

Accepted : 09 March 2016

Published : 29 September 2016

Issue Date : December 2016

DOI : https://doi.org/10.1007/s12303-016-0017-x

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EXPLORING HISTORICAL EARTHQUAKES IN THE PHILIPPINES: A GEOSTATISTICAL AND SPACE TIME APPROACH

The Philippines is one of the most geologically active country in Asia. The country averages 3.2 earthquakes per day and are mostly oceanic in origin. Even though there have been evolutions and advancement in earth observation and highly sensitive seismic stations, these still fall short for us to get a reliable information that would let scientist and engineers predict when, where and how strong an earthquakes might happen. Research from seismologist concludes that the effort of predicting earthquake occurrences is an almost impossible job but as more and more historical data are being observed, return periods or the average time that recurrence of such an even can be estimated but can never be exact. Because of that, efforts and measures were put on how to mitigate and adapt to such an event rather than wasting time and effort predicting an occurrence of an earthquake. This research demonstrates the use of geostatistical and space time pattern approach through exploratory data analysis of historical records. Based on the findings, geostatistics can be used as an approach to generate a surface that will predict likelihood of occurrence of such an event on areas with no occurrences yet. Space time pattern mining on the other hand addresses and qualifies the type of hot spot a particular region has in terms of space (spatial) and time (temporal) variations of clustering and conceptualization of spatial relationships.

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Perceptions of Disaster Resilience and Preparedness in the Philippines

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The Philippines is one of the world’s most disaster-prone countries. Located along the boundary of major tectonic plates and at the center of a typhoon belt, its islands are regularly impacted by floods, typhoons, landslides, earthquakes, volcanoes, and droughts. The Philippines also ranks among the top three countries in the world for population exposure and vulnerability to hazards. The Philippine government has developed strong coping mechanisms over their long history of experience with disasters. Yet, significant gaps remain in disaster management capacities across different regions of the Philippines and surprisingly little data are available referencing local levels of disaster resilience and preparedness.

This research aims to address the gap in knowledge on both local disaster resilience and preparedness by providing a comprehensive overview of household measures of resilience and levels of disaster preparedness. This is the first nationwide household survey on measures of disaster resilience and disaster preparedness carried out in the Philippines. It comes at a time of critical importance as efforts are being made to ensure disaster management is based on evidence, especially at the local level and amid national discussions on centralizing disaster resilience efforts under a single national agency.

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Earthquake impact reduction study for metropolitan manila, republic of the philippines.

Contains the information of overall study and its results; that is the background information of this study, earthquake damage scenario, and master plan and action plans for safer Metropolitan Manila.

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