Table 1. For the original 1931 version of the scale, see H. O. Wood and F. Neumann. Modified Mercalli Intensity Scale of 1931, Seismological Society of American Bullletin, 53 (5), pp. 979--87. For the 1956 version, see C.F. Richter, Elementary Seismology (San Francisco: Freeman, 1958), pp. 137-38.

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