The highest rating, a XII, is applied to earthquakes in which structures are destroyed, the ground is cracked and other natural disasters, such as landslides or tsunamis, are initiated. A low intensity earthquake, one in which only some people feel the vibration and there is no significant property damage, is rated as a II. Mercalli ratings, which are given as Roman numerals, are based on largely subjective interpretations. It is known today as the Modified Mercalli Intensity Scale. The Mercalli Intensity Scale was developed by the Italian volcanologist Giuseppe Mercalli in 1884 and expanded to include 12 degrees of intensity in 1902 by Adolfo Cancani. The extent of damage is rated on the Mercalli Intensity Scale. As we've seen, an earthquake's destructive power varies depending on the composition of the ground in an area and the design and placement of man-made structures. However, Richter ratings only give you a rough idea of the actual impact of an earthquake. Image: Modified Mercalli Scale VS Richter Scale
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