Well, it doesn’t sound like bees or locusts....
I had no clue what the title was referring to, not being familiar with USGS terminology.
Perhaps the mods could do something with the title so that people will know it’s about volcanoes?
“I had no clue what the title was referring to, not being familiar with USGS terminology.”
An earthquake swarm is a series of quakes occurring in the same approximate place in the Earth’s crust.