Very slow vertical movement of the Earth's crust, occurring over years or centuries.
From Greek 'brady-' (slow) and 'seismos' (earthquake, tremor). The term describes tectonic movements so gradual that earthquakes are not involved.
Venice sinking into the Adriatic is bradyseism—it's dropping about 1-2 millimeters per year, so slow you can't see it happening, yet catastrophic over centuries.
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