The occurrence in a place of a large number of minor earthquakes in a relatively short space of time (typically days or weeks), with no one earthquake being identifiable as the main shock.
Origin
Early 20th century.
Definition of earthquake swarm in US English:
earthquake swarm
noun
Geology
The occurrence in a place of a large number of minor earthquakes in a relatively short space of time (typically days or weeks), with no one earthquake being identifiable as the main shock.