This protracted rupture fundamentally reshaped the scientific understanding of how tectonic plates interact at the deepest levels of the subduction zone. The 1960 Valdivia Earthquake: A Case Study The 22 May 1960 earthquake, known as the Great Chilean Earthquake, holds the record for the longest duration of rupture.
Feel the Shaking: How the Longest Earthquake Minutes Redefined Disaster
The Nazca Plate is not a uniform slab; it has irregularities and asperities that catch and release as it subducts. 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.
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. Instead, the fault unzipped in a series of pulses over a span of roughly 10 minutes.
Feeling the Shaking Minutes: The Longest Earthquake's Lingering Impact
Buildings were subjected to relentless shaking, which fatigue materials far more effectively than a quick, sharp jolt. 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.
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