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the December 1857 Basilicata earthquake, also known as The Great Neapolitan Earthquake of 1857. The first widely adopted intensity scale, the 10-grade Rossi-Forel scale, was introduced in the late 19th century. In 1902, Italian seismologist Giuseppe Mercalli, created the Mercalli Scale, a new 12-grade scale. Significant improvements were achieved, mainly by Charles Francis Richter

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