A geophone consists of a (i) coupler, a spike which couples the geophone to the earth, (ii) a copper wire coil that is suspended (using tiny mechanical springs) around a central conductor and that can move up and down the central conductor, (iii) an electrical lead out of the geophone to transmit data and (iv) a protective case.
(A geophone; consists; of a (i) coupler) (a spike; couples; the geophone; to the earth) (ii) a copper wire coil; is suspended; )
A geophone a spike ii) a copper wire coil
consists couples is suspended
of a (i) coupler
the geophone to the earth