convulsion

mullistus

kouristus

kuohunta, sekasorto

kouristukset puhekieltä An intense, paroxysmal, involuntary muscular contraction.
An uncontrolled fit, as of laughter; a paroxysm.
Violent turmoil.

Earthquakes and convulsions of nature shake Earth on a regular basis.

In a convulsion that has caught many in Brazil and beyond by surprise, waves of protesters denounced their leaders for dedicating so many resources to cultivating Brazil’s global image by building stadiums for international events, when basic services like education and health care remain woefully inadequate.