noun
slow earthquake; slow slippage
Technical term in seismology for a type of fault slip that occurs slowly over days to years, without generating strong seismic waves.
ゆっくり滑りは、通常の地震計では捉えられないことが多い。
Slow earthquakes are often undetectable by ordinary seismometers.
In this region, slow slippage is observed once every few years.