Relating to regions, structures, or geological features that do not experience earthquakes or are not affected by seismic waves.
From Greek 'a-' (without) + 'seisma' (earthquake). This became the standard scientific term for describing earthquake-free zones or slip that occurs without detectable seismic waves.
Scientists recently discovered that some faults slip 'aseismically'—just quietly gliding without causing earthquakes—which was a huge deal because they thought all major faults had to produce big quakes!
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