seismic vertical

1 definition found

seismic vertical - Collaborative International Dictionary of English v.0.48 :

  Seismic \Seis"mic\, Seismal \Seis"mal\, a. [Gr. seismo`s an
     earthquake, from sei`ein to shake.]
     Of or pertaining to an earthquake; caused by an earthquake.
     [1913 Webster]
  
     Seismic vertical, the point upon the earth's surface
        vertically over the center of effort or focal point whence
        the earthquake's impulse proceeds, or the vertical line
        connecting these two points.
        [1913 Webster]