Slow earthquakes can be episodic ( relative of plate movement ) , and therefore somewhat predictable , a phenomenon termed " episodic tremor and slip " or " ETS " in the literature . ETS events can last for weeks as opposed to " normal earthquakes " occur in a matter of seconds . Several slow-earthquake events around the world appear to have triggered major , damaging seismic earthquakes in the shallower crust ( e.g. , 2001 Nisqually , 1995 Antofagasta ) . Conversely , major earthquakes trigger " post-seismic creep " in the deeper crust and mantle
1995 Antofagasta
1995 Antofagasta earthquake
Slow earthquake