OK, so there's a large number and when seismologists, that's people who study earthquakes, talk about a 'swarm of earthquakes,' they mean that there is a large number of them close together that appear in a short space of time and that's often a sign of volcanic activity.
所以數量很大,當地震學家,即研究地震的人,談論「地震群」時,他們的意思是,在很短的時間內出現大量緊密相連的地震,這通常是一次地震。火山活動的跡象。