In 1737, an earthquake in central Chile that went largely unreported caused a tsunami that subsequently evaded historical records. So how did we find out about it? By looking at disturbances in sand. Yeah, sand. The discovery then changes what we know about the frequency of earthquakes in this region.
Source:
Geological evidence of an unreported historical Chilean tsunami reveals more frequent inundation, by E.P. Hocking et al., published December 2021
https://www.nature.com/articles/s43247-021-00319-z
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