Most earthquakes cluster around tectonic boundaries, but broad global zones are only a starting point. Local hazard depends on specific faults, geology, distance, and building conditions.
A broad belt around the Pacific Ocean where subduction zones, trenches, volcanic arcs, and transform boundaries produce frequent earthquakes. It includes parts of the west coasts of the Americas, Alaska, Japan, the Philippines, Indonesia, Papua New Guinea, and New Zealand.
A complex collision zone extending from the Mediterranean through Turkey, Iran, the Himalayas, and into Southeast Asia. Earthquakes here are linked to the interaction of the African, Arabian, Indian, and Eurasian plates.
Long underwater mountain systems where plates move apart and new oceanic crust forms. These divergent boundaries produce many earthquakes, although most occur far from populated land.
Areas where continental crust is stretching and thinning, such as the East African Rift. Fault movement within rift systems can generate damaging shallow earthquakes.
| Setting | How earthquakes occur |
|---|---|
| Convergent | Plates move toward each other. Subduction and continental collision can produce powerful earthquakes, mountain building, and tsunamis. |
| Transform | Plates slide horizontally past one another. Stress accumulates along faults and can be released in shallow earthquakes. |
| Divergent | Plates move apart. Earthquakes commonly occur along spreading ridges and continental rifts. |
| Intraplate | Earthquakes can also occur within a plate when older zones of weakness are reactivated. Distance from a plate boundary does not mean zero seismic activity. |
QuakeScout’s local pages show the exact search radius, magnitude threshold, and time window used for recent USGS events. They are activity trackers—not engineering or insurance assessments.
Educational overview only. See data sources and methodology.