Earthquake Swarm ( UPSC Prelims)

News Context

 ● Sequences of numerous earthquakes happening over a brief period without a distinct main shock.  
  ● Recent Occurrence: Iceland, triggered by a lava eruption.  
  ● Swarms may persist for weeks and generate several thousand earthquakes.  
      ○ Noted in volcanic environments, hydrothermal systems, and other active geothermal areas.