Story: Active faults
Earthquakes occur on fractures, or faults, within the Earth. Active faults have ruptured repeatedly, and may move again. The most spectacular is the Alpine Fault, where the Southern Alps are being uplifted. The city of Wellington was built, unknowingly, on another active fault. Geologists have now identified these lines of weakness, and there is greater awareness of the hazards of building where the earth may suddenly shift again.