A small earthquake or tremor that occurs following a major one
Most earthquake clusters consist of small tremors that cause 
little to no ... of 18 major earthquakes (magnitude 7.07.9) and one great 
earthquake... [DOC] [TLE] Earthquakes and faults - Putting Down Roots in Earthquake Country [PAR] In any earthquake cluster, the largest one is called the mainshock; anything ... 
Also, just as smaller earthquakes can continue to occur a year or more after a... [DOC] [TLE] Earthquakes & Tsunamis: Causes & Information - Live Science [PAR] Apr 20, 2015 ... Earthquakes occur every day, but most people don't notice the small ones.