. Earthquakes and other earth movements . 32. , it traverses a in a time t^. If v equals the velocity of then t=.'^, t^ = \±Jh^ I ft ~\~ iJUn &c. Seebach now says that if we have given the ^position of M or epicentrum of the shock, and draw through it rectangular axes like M m^ and M Tg, and lay down on * Report of British Association, 1847, p. 84.

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