Formal or literary term for a state of intense, often collective, excitement or frenzy. Used in contexts like social phenomena, historical events, or psychological states.
狂気 means 'madness' or 'insanity' as a mental state, whereas 狂騒 refers to outward, often collective, excited behavior.
Etymology
Compound of 狂 (kyō, 'madness, wild') and 騒 (sō, 'noise, clamor'). The alternate form 狂躁 uses 躁 (sō, 'mania, agitation'), emphasizing the manic aspect. The word is a Sino-Japanese compound (kango).