The relation of the seismic and the volcanic phenomena is clearly to be seen.
In the process of breaking, vibrations called “seismic waves” are generated.
There is no evidence of seismic disturbance in this region, either past or present.
Disturbances of this kind are perhaps “seismic,”—caused by earthquakes!
It is to this class, then, that their seismic clock belongs.
With a dozen such instances the plane of what is called the seismic vertical is established (seismos is the Greek for earthquake).
A great earthquake rarely, if ever, occurs without some preparation in the form of a marked increase of seismic activity.
The portion of the earth's surface which is vertically above the seismic focus is called the epicentre.
One clue to the solution of the problem is afforded by the seismic death-rate of the damaged towns.
One received the impression that a seismic disturbance might awaken some show of emotion, but design—never.