The prolonged motion generated a series of waves that traveled across the Pacific Ocean, demonstrating the global reach of such a massive geological event. Instead, the fault unzipped in a series of pulses over a span of roughly 10 minutes.
Measuring the Longest Earthquake Rupture Time Scientists Recorded
Originating off the coast of southern Chile, the rupture propagated northward along the boundary where the Nazca Plate dives beneath the South American Plate. The longest earthquake on record, the 1960 Valdivia earthquake in Chile, released energy over a duration of approximately 10 minutes, challenging the common perception of seismic events as sudden, instantaneous occurrences.
This extended duration is evident in the rolling, long-period waves captured on seismographs, which continued to pulse long after the initial shock front had passed. This protracted rupture fundamentally reshaped the scientific understanding of how tectonic plates interact at the deepest levels of the subduction zone.
Measuring the Record-Breaking Rupture Time of the Longest Earthquake
Analyzing the Rupture Timeline Seismological data from stations around the world revealed that the earthquake did not occur as a single sharp snap. 6 One of the most powerful ever recorded Duration of Rupture ~10 minutes The primary metric for "longest earthquake" Maximum Mercalli Intensity XI (Extreme) Caused widespread devastation Tsunami Height 25 meters (82 ft) Affected coasts across the Pacific Geological Factors Contributing to the Length The extraordinary duration is attributed to the specific geometry and friction of the fault zone.
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