isoseismal

Outside the isoseismal 4, the earthquake was observed at several places.

An isoseismal line is a curve which passes through all points at which the intensity of the shock was the same.

Fig. 19 shows the principal isoseismal lines as drawn by the Italian commissioners.

Within the isoseismal 3, buildings were more or less slightly damaged.

The only complete map of the isoseismal lines is that drawn by Professor Mercalli.