Page:Great Neapolitan Earthquake of 1857 Vol 2.djvu/401

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VELOCITIES OF WAVE PARTICLE.

pier or tower; and the third, where it is possible, but not necessary to conclude, that the determination is below the tenth, from some cause.

Wave Velocities.
Station. Velocities. Method of Determination. Distance from Seismic Vertical.
Feet per Second. Geog. Miles.
Polla 12.836 |mean 13.176 Overthrow and projection 3.45
,, 13.176
Padula 12.386 |mean 12.896 Overthrow and projection 16.45
,, 13.152
Certosa di St Bruno 11.540 Projection 16.50
Moliterno 11.800 Projection 25.50
Viscolione,near Saponara 11.040 Overthrow 26.00
Tramutola 14.765 Projection 20.60
Potenza 12.255 Fracture and overthrow 15.00
Monticchio 11.757 Projection 23.50
Barielle 11.564 Overthrow 24.50
Certosa, Vase of Gate, of the Prior's Garden 21.230 Projection 16.50
Saponara 15.627 Fracture and overthrow 25.00
Sarconi 9.780 Projection 26.70

The mean velocity given, by the first group of eleven separate and independent determinations, is 12·366 feet per second. It is a little doubtful, (Part II. in loc.) whether the velocity at Tramutola, was not slightly increased, by some surface oscillation; reasons of sufficient weight however are assignable from conditions of formation alone for finding a high velocity at that place.

If we omit Tramutola, and deduce a mean velocity from the remaining ten terms, we obtain 12·039 feet per second;