Note 84 — Chapter X · ToC
Reading edition
There is no reason why the surface-undulations of the Indian earthquake should not have produced a sensible shock even as far as Italy. Taking their amplitude in that country at 508 mm. and their period at 22 sec. (p. 283), the maximum acceleration would be about 40 mm. per sec., corresponding to the intensity 2 of the Rossi-Forel scale. (Amer. Journ. Sci., vol. xxxv., 1888, p. 429.)