(definition) by Webster 1913 Wed Dec 22 1999 at 2:59:22

Seis"mic (?), Seis"mal (?), a. [Gr. an earthquake, from to shake.]

Of or pertaining to an earthquake; caused by an earthquake.

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.

 

© Webster 1913.

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