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Seismic intensity scales categorize the intensity or severity of ground shaking (quaking) at a given location, such as resulting from an earthquake. They are distinguished from seismic magnitude scales , which measure the magnitude or overall strength of an earthquake, which may, or perhaps may not, cause perceptible shaking.
v. t. e. The Modified Mercalli intensity scale (MM, MMI, or MCS) measures the effects of an earthquake at a given location. This is in contrast with the seismic magnitude usually reported for an earthquake. Magnitude scales measure the inherent force or strength of an earthquake – an event occurring at greater or lesser depth. (The " Mw ...
AD 62 Pompeii earthquake. On 5 February AD 62, an earthquake of an estimated magnitude of between 5 and 6 and a maximum intensity of IX or X on the Mercalli scale struck the towns of Pompeii and Herculaneum, severely damaging them. The earthquake may have been a precursor to the eruption of Mount Vesuvius in AD 79, which destroyed the same two ...
December 16, 1811, 0815 UTC (2:15 am); (M about 7.5) [17] epicenter in northeast Arkansas, probably on the Cottonwood Grove fault; [18]: p. 7 it caused only slight damage to man-made structures, mainly due to the sparse population in the epicentral area. The future location of Memphis, Tennessee, was shaken at Mercalli level IX intensity.
Charles Richter. Charles Francis Richter (/ ˈrɪktər /; April 26, 1900 – September 30, 1985) was an American seismologist and physicist. He is the namesake and one of the creators of the Richter magnitude scale, which, until the development of the moment magnitude scale in 1979, was widely used to quantify the size of earthquakes.
Statistics, in the modern sense of the word, began evolving in the 18th century in response to the novel needs of industrializing sovereign states. In early times, the meaning was restricted to information about states, particularly demographics such as population. This was later extended to include all collections of information of all types ...
The earthquake hit at 19:05:53 Gansu-Sichuan time (12:05:53 UTC), [6] reportedly 8.25 M w [7] or 7.8 M L, and was followed by a series of aftershocks for three years. The often cited magnitude in scientific literature is M 8.5 which has been regarded as an overestimate due to the limited technological advancements and instrumentation during the period which the earthquake occurred.
75,000–82,000 [ 3 ] A devastating earthquake occurred on 28 December 1908 in Sicily and Calabria, southern Italy with a moment magnitude of 7.1 and a maximum Mercalli intensity of XI (Extreme). The epicentre was in the Strait of Messina which separates Sicily from the Italian mainland.