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Probabilistic Seismic Hazard Analysis model for the Philippines

Created 17/10/2025

Updated 17/10/2025

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The Philippine archipalego is tectonically complex and seismically hazardous, yet few seismic hazard assessments have provided national coverage. This paper presents an updated probabilistic seismic hazard analysis for the nation. Active shallow crustal seismicity is modeled by faults and gridded point sources accounting for spatially variable occurrence rates. Subduction interfaces are modelled with faults of complex geometry. Intraslab seismicity is modeled by ruptures filling the slab volume. Source geometries and earthquake rates are derived from seismicity catalogs, geophysical datasets, and historic-to-paleoseismic constraints on fault slip rates. The ground motion characterization includes models designed for global use, with partial constraint by residual analysis. Shallow crustal faulting near metropolitan Manila, Davao, and Cebu dominates shaking hazard. In a few places, peak ground acceleration with 10% probability of exceedance in 50 years on rock reaches 1.0 g. The results of this study may assist in calculating the design base shear in the National Structural Code of the Philippines.

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Field Value
Title Probabilistic Seismic Hazard Analysis model for the Philippines
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/42cd6fcd-b5fd-4059-bc73-a1f6f852f7ae
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 04/06/2019
Geospatial Coverage
Map data © OpenStreetMap contributors
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      ],
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    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Probabilistic Seismic Hazard Analysis model for the Philippines". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/probabilistic-seismic-hazard-analysis-model-for-the-philippines