The Big One will be a great earthquake. An earthquake is the shaking of the ground cause by seismic waves. Almost all earthquakes occur when pent up stress in rocks along large, active faults (like the SAF) is suddenly released as the rock breaks.he Big One will be a great earthquake. An earthquake is the shaking of the ground cause by seismic waves. Almost all earthquakes occur when pent up stress in rocks along large, active faults (like the SAF) is suddenly released as the rock breaks.
  Magnetism is the force generated by any moving charged particle or charged particles. A magnetic field is the result of the motion of a charged particle or charged particles, and this field is generated in no other way. Any time a charged particle moves, it creates a magnetic field around its path of travel.
Magnetosphere: Ganymede is unique among moons in the Solar Systems in that it alone has a magnetosphere. The value of the moonâs permanent magnetic moment is estimated to be 1.3 x 10Â¹Â³ TÂ·mÂ³, which is three times larger than the magnetic moment of Mercury.