noun, noun or participle which takes 'suru', intransitive verb
repeated occurrence; cluster of events
Used for events that happen in clusters or repeatedly, such as earthquakes, accidents, or crimes. Often appears in compounds like 群発地震 (earthquake swarm).
この地域では群発地震が続いている。
A swarm of earthquakes has been continuing in this region.
交通事故が群発し
Traffic accidents are occurring repeatedly.