Book 7
24.8
Springs of water generally dry up; blasts of wind sometimes swoop upon the land and overturn the trees; occasionally great flames dart across the sky; the shapes of stars too appear such as have never been witnessed before, producing consternation in those that witness them; furthermore there is a violent rumbling of winds beneath the earth—these and many other warnings is the god wont to send before violent earthquakes occur.
24.9
The shock itself is not of one fixed type, but the original inquirers into such matters and their pupils have been able to discover the following forms of earthquake. The mildest form—that is, if such a calamity admits of mitigation—is when there coincides with the original shock, which levels the buildings with the ground, a shock in the opposite direction, counteracting the first and raising up the buildings already knocked over.
24.10
In this form of' earthquake pillars may be seen righting themselves which have been almost entirely uprooted, split walls coming together to their original position; beams, dislocated by the shock, go back to their places, and likewise channels, and such-like means of furthering the flow of water, have their cracks cemented better than they could be by human craftsmen. Now the second form of earthquake brings destruction to anything liable to it, and it throws over at once, as it were by a battering-ram, whatever meets the force of its impact.
24.11
The most destructive kind of earthquake the experts are wont to liken to the symptoms of a man suffering from a non-intermittent fever, the breathing of such a patient being rapid and laboured. There are symptoms of this to be found in many parts of the body, especially at each wrist. In the same way, they say, the earthquake dives directly under buildings and shakes up their foundations, just as molehills come up from the bowels of the earth. It is this sort of shock alone that leaves no trace on the ground that men ever dwelt there.
