Seismic Behavior and Tectonics of Philippine Fault Systems
Summary
The Philippines lies at the convergence of the Sunda and Philippine Sea plates, hosting one of the world’s longest strike-slip systems. The Philippine Fault System comprises multiple left-lateral strands that accommodate oblique plate motion through a combination of seismic rupture and aseismic slip. Along its length, segments vary in coupling: locked patches build elastic strain over decades, while creeping sections release energy gradually without large earthquakes. Interaction between fault strands via Coulomb stress transfer can trigger sequential ruptures and complex conjugate faulting. Geodetic observations, particularly GNSS and InSAR, together with field mapping and seismic analysis, have delineated slip rates from a few millimetres to several centimetres per year and revealed blind ruptures at mid-crustal depths. These insights inform seismic hazard models for a nation prone to damaging earthquakes, landslides and tsunamis, and contribute to global understanding of tectonic processes in oblique convergent margins.
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Seismic Behavior and Tectonics of Philippine Fault Systems publication trend
The graph below shows the total number of articles in seismic behavior and tectonics of philippine fault systems across all publications each year (not limited to Nature Index journals).
Technical terms
Aseismic creep: Slow, continuous slip along a fault surface that occurs without significant seismic waves.
Interferometric Synthetic Aperture Radar (InSAR): Satellite radar technique that measures ground deformation by comparing phase differences between successive images.
Coulomb stress: Change in stress on a fault plane caused by nearby seismic events, affecting the likelihood of failure.
Locked patch: A section of a fault that remains stuck and accumulates elastic strain until it fails in a seismic event.
Strike-slip fault: A fault where dominant movement is horizontal and parallel to the fault trace.
References
- Rupture process of the 2019 Mw 6.8 Davao Del Sur earthquake, Philippines from geodetic and seismic data. Geomatics Natural Hazards and Risk (2024).
- Creep rates of the Philippine fault on Leyte Island based on offset cultural features. Geoscience Letters (2024).
- Surface creep rate distribution along the Philippine fault, Leyte Island, and possible repeating of Mw ~ 6.5 earthquakes on an isolated locked patch. Earth, Planets and Space (2019).
- Impacts and causative fault of the 2022 magnitude (Mw) 7.0 Northwestern Luzon earthquake, Philippines. Frontiers in Earth Science (2023).
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