[1] : The Collaborative International Dictionary of English v.0.48

earthquave \earth"quave`\, n.
   an earthquake.
   1913 webster

[2] : The Collaborative International Dictionary of English v.0.48

earthquake \earth"quake`\, n.
   a shaking, trembling, or concussion of the earth, due to
   subterranean causes, often accompanied by a rumbling noise.
   the wave of shock sometimes traverses half a hemisphere,
   destroying cities and many thousand lives; -- called also
   earthdin, earthquave, and earthshock.
   1913 webster

   earthquake alarm, a bell signal constructed to operate on
      the theory that a few seconds before the occurrence of an
      earthquake the magnet temporarily loses its power.
      1913 webster
see also:
earthdin earthquave earthshock earthquake alarm 

Earthquave >> E Words
Earthquave, definition of term: Earthquave
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