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|Born||21 May 1850|
|Died||19 March 1914 (aged 63)|
|Known for||Mercalli intensity scale|
Born in Milan, Mercalli was ordained a Roman Catholic priest and soon became a professor of Natural Sciences at the seminary of Milan. The Italian government appointed him a professor at Domodossola, followed by a job at Reggio di Calabria. He was professor of geology at the University of Catania during the late 1880s and finally was given a job at Naples University. He was also director of the Vesuvius Observatory until the time of his death.
Giuseppe Mercalli also observed eruptions of the volcanoes Stromboli and Vulcano in the Aeolian Islands. His descriptions of these eruptions became the basis for two indices of the Volcanic Explosivity Index: 1 - Strombolian eruption, and 2 - Vulcanian eruption. He also photographed Vesuvius immediately after its eruption in 1906.
In 1914, Mercalli burnt to death under suspicious circumstances, allegedly after knocking over a paraffin lamp in his bedroom. He is thought to have been working through the night, as he often did (he once was found working at 11 a.m. when he had set an examination, upon hearing which he replied, “It surely can't be daylight yet!”), when the fatal accident occurred. His body was found, carbonized, by his bed, holding a blanket which he apparently attempted to use to fend off the flames. The authorities, however, stated a few days later that the professor was quite possibly murdered by strangling and soaked in petrol and burned to conceal the crime because they determined that some money (now worth about $1,400) was missing from the professor's apartment.
Mercalli devised two earthquake intensity scales, both modifications of the Rossi–Forel scale. The first, now largely forgotten, had six degrees whereas the Rossi–Forel scale had ten. The second, now known as the Mercalli intensity scale, had ten degrees, and elaborated the descriptions in the Rossi–Forel scale.
The Mercalli intensity scale is, in modified form, still used. Unlike the Richter magnitude scale, which measures the energy released by an earthquake, the Mercalli intensity scale measures the effects of an earthquake on structures and people. It is poorly suited for measuring earthquakes in sparsely populated areas but useful for comparing damage done by various tremors and historical earthquakes, and for earthquake engineering. The scale in use presently assigns indices ranging from I - "Not felt, except by a few under favorable conditions", to XII - "Damage total; objects thrown into the air."
Italian physicist Adolfo Cancani expanded the ten-degree Mercalli scale with the addition of two degrees at the more intense of the scale: XI (catastrophe) and XII (enormous catastrophe). This was later modified by the German geophysicist August Heinrich Sieberg and became known as the Mercalli–Cancani–Sieberg (MCS) scale. This was modified again and published in English by Harry O. Wood and Frank Neumann during 1931 as the Mercalli–Wood–Neumann (MWN) scale. It was later improved by Charles Richter, developer of the Richter scale. The scale is known now as the Modified Mercalli intensity scale (MM or MMI).
- "PROF. G. MERCALLI BURNED TO DEATH; Famous Director of Vesuvian Observatory Upsets Oil Lamp Upon Himself". The New York Times. March 20, 1914.
- Mercalli, Giuseppe (1883). Vulcani e Fenomeni Vulcanici in Italia. Geologia d’Italia. 3. Milan: Francesco Vallardi. pp. 217–218.
- Davison, C (1921). "On scales of seismic intensity and on the construction of isoseismal lines". Bull. Seismol. Soc. Am. (11): 95–129.
- Mercalli, Giuseppe (1902). "Sulle modificazioni proposte alla scala sismica De Rossi-Forel". Boll Soc Sismol Ital (8): 184–191.
- Howell, Jr., B. F. (2003), "Biographies of interest to earthquake and engineering seismologists", International Handbook of Earthquake & Engineering Seismology, Part B, Volume 81B (First ed.), Academic Press, p. 1761, ISBN 978-0124406582
- Cancani, Adolfo (1904). "Sur l'emploi d'une double echelle sismique des intensitès, empirique et absolue". Gerlands Beitr Geophys (2): 281–283.