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during the 1950s, when (1) a correlation was found between seismic intensity and the Peak ground acceleration (PGA; see the equation that Richter found for California). and (2) a definition of the strength of the buildings and their subdivision into groups (called type of buildings) was made. Then, the seismic intensity was evaluated based on the degree of damage to a given type of structure. That gave the Mercalli Scale, as well as the European MSK-64 scale that followed, a quantitative element

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