This protracted rupture fundamentally reshaped the scientific understanding of how tectonic plates interact at the deepest levels of the subduction zone. The Nazca Plate is not a uniform slab; it has irregularities and asperities that catch and release as it subducts.
How the Longest Earthquake Unfolded Over Approximately 10 Minutes
While shaking might last for seconds or minutes, the rupture process itself can unfold over a much longer period. Instead, the fault unzipped in a series of pulses over a span of roughly 10 minutes.
While the focus was relatively shallow at around 25 kilometers, the interaction between the two plates occurred across a very wide area, stretching over 1,000 kilometers of coastline. Analyzing the Rupture Timeline Seismological data from stations around the world revealed that the earthquake did not occur as a single sharp snap.
How the Longest Earthquake Unfolded Over Approximately 10 Minutes
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.
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More perspective on How long was the longest earthquake can make the topic easier to follow by connecting earlier points with a few simple takeaways.
