Giuseppe Mercalli was person who invented Mercalli scale to measure earthquake intensity and Charles Francis Richter  was an American seismologist and physicist.
It is known today as the Modified Mercalli Intensity Scale. The Richter Magnitude Scale was developed in 1935 by Charles Richter. It was initially created to study a particular area in California, using the Wood-Anderson torsion seismograph, to compare the size of different earthquakes in the region. The Mercalli scale is linear and the Richter scale is logarithmic. i.e. a magnitude 5 earthquake is ten times as intense as a magnitude 4 earthquake. At the time when Richter began a collaboration with Gutenberg, the only way to rate shocks was a scale developed in 1902 by the Italian priest and geologist Giuseppe Mercalli. The Mercalli scale uses Roman numerals and classifies earthquakes from I to XII, depending on how buildings and people responded to the tremor. Richter's parents (Fred W. Kinsinger and Lillian Anna Richter) were divorced when he was very young. He grew up with his maternal grandfather, who moved the family (including his mother) to Los Angeles in 1909. Charles Francis Richter (/ˈrɪktər/ ; April 26, 1900 – September 30, 1985) was an American seismologist and physicist. Richter is most famous as the creator of the Richter magnitude scale which, until the development of the moment magnitude scale in 1979, quantified the size of earthquakes. Richter's parents (Fred W. Kinsinger and Lillian Anna Richter) were divorced when he was very young. He grew up with his maternal grandfather, who moved the family (including his mother) to Los Angeles in 1909. Childhood and education [edit]. Richter was born in Overpeck, Ohio. Richter had German heritage: his great-grandfather came from Baden-Baden (Baden-Wuerttemberg, Württemberg) germany in 1848 due to political. Instability'richter s (Parents Fred. W kinsinger And Lillian Anna) richter were divorced when he was very. young Richter's parents (Fred W. Kinsinger and Lillian Anna Richter) were divorced when he was very young. He grew up with his maternal grandfather, who moved the family (including his mother) to Los Angeles in 1909. The Mercalli intensity scale is a seismic scale used for measuring the intensity of an earthquake. It measures the effects of an earthquake, and is distinct from the moment magnitude usually reported for an earthquake (sometimes misreported as the Richter magnitude), which is a measure of the energy released. It was later improved by Charles Richter, the father of the Richter magnitude scale. The scale is known today as the Modified Mercalli scale (MM) or Modified Mercalli Intensity scale (MMI). Figure 2 - Giuseppe Mercalli. Another way to measure the strength of an earthquake is to use the Mercalli scale. Invented by Giuseppe Mercalli in 1902, this scale uses the observations of the people who experienced the earthquake to estimate its intensity. The Mercalli scale isn't considered as scientific as the Richter scale, though. The Richter Scale. Figure 1 - Charles Richter studying a seismogram. There are a number of ways to measure the magnitude of an earthquake. The first widely-used method, the Richter scale, was developed by Charles F. Richter in 1934. At the time, the only way to rate shocks was a scale developed in 1902 by the Italian priest and geologist Giuseppe Mercalli. The Mercalli scale classified earthquakes from 1 to 12, depending on how buildings and people responded to the tremor. Charles F. Richter (1900-1985) was one of the developers of the Richter Scale which is used to measure the magnitude of earthquakes. Charles F. Richter is remembered every time an earthquake happens. With German-born seismologist Beno Gutenberg, Richter developed the scale that bears his name and measures the magnitude of earthquakes The Mercalli–Cancani–Sieberg scale was later modified and published in English by Harry O. Wood and Frank Neumann in 1931 as the Mercalli–Wood–Neumann (MWN) scale. It was later improved by Charles Richter, the father of the Richter magnitude scale. The scale is known today as the Modified Mercalli scale (MM) or Modified Mercalli Intensity scale (MMI).
http://www.diffen.com/difference/Mercalli_Scale_vs_Richter_Scale https://en.wikipedia.org/wiki/Charles_Francis_Richter https://en.wikipedia.org/wiki/Charles_Francis_Richter https://en.wikipedia.org/wiki/Charles_Francis_Richter https://en.wikipedia.org/wiki/Mercalli_intensity_scale http://www.geo.mtu.edu/UPSeis/intensity.html http://biography.yourdictionary.com/charles-f-richter https://en.wikipedia.org/wiki/Mercalli_intensity_scale
who is giuseppe mercalli and charles richter