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The region examined in this expedition, embraces, in its widest extent, most of the country between a line drawn from Terracina to Gargano on the north, down to the Gulf of Tarentum on the south. The earthquake, the greatest that has occurred in Italy since that of 1783, was felt over nearly the whole of the Peninsula south of Terracina and Gargano. Its area of greatest destruction (the meizoseismal area), within which nearly all the towns were wholly demolished, was an oval whose major axis was in a direction N. W. and S. E. nearly, and about 25 geog. miles in length by 10 geog. miles in width. The first isoseismal area beyond this, within which buildings were everywhere more or less prostrated and people killed, is within an oval of about 60 geog. miles by 35 geog. miles; the second isoseismal is also an oval within which buildings were everywhere fissured, but few prostrated and few or no lives lost. The third isoseismal embraces a greatly enlarged area, within which the earthquake was everywhere perceived by the unassisted senses, but did not produce injury. A fourth isoseismal was partially traced, within which the shock was capable of being perceived by instrumental means, and which probably reached beyond Rome to the northward.

proceedings of the royal society of london

IV. Report to the Royal Society of the expedition into the Kingdom of Naples to investigate the circumstances of the earthquake of the 16th December 1857