The Mechanics, Metrics, and Multi-Hazard Impacts of Seismic Activity
On June 8, 2026, a massive magnitude 7.8 earthquake struck roughly 32 km offshore south of the region, linked to the highly active Cotabato Trench. | Photo Courtesy of PHIVOLCS An earthquake is the sudden, violent shaking of the Earth's surface caused by a rapid release of energy within the lithosphere. This phenomenon occurs when tectonic plates moving over the fluid mantle get locked together due to friction. As the plates continue their slow journey, stress builds up continuously until the underlying rock finally ruptures or slips along a geological fracture known as a fault line. This abrupt movement releases immense energy in the form of seismic waves, which radiate outward in all directions and cause the destructive ground vibrations felt on the surface. Globally, millions of earthquakes occur every year, although only a small fraction are intense enough to be noticed by humans or to cause widespread infrastructural damage. Approximately 80% to 81% of the world’s largest, mos...
