Seismic intensity scale used to quantify the degree of shaking during earthquakes
"Mercalli" redirects here. For the scientist whom the scale is named after, see Giuseppe Mercalli.
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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" scale is widely used.) The MM scale measures intensity of shaking, at any particular location, on the surface. It was developed from Giuseppe Mercalli's Mercalli intensity scale of 1902.
While shaking experienced at the surface is caused by the seismic energy released by an earthquake, earthquakes differ in how much of their energy is radiated as seismic waves. They also differ in the depth at which they occur; deeper earthquakes have less interaction with the surface, their energy is spread throughout a larger volume, and the energy reaching the surface is spread across a larger area. Shaking intensity is localized. It generally diminishes with distance from the earthquake's epicenter, but it can be amplified in sedimentary basins and in certain kinds of unconsolidated soils.
Intensity scales categorize intensity empirically, based on the effects reported by untrained observers, and are adapted for the effects that might be observed in a particular region.[1] By not requiring instrumental measurements, they are useful for estimating the magnitude and location of historical (preinstrumental) earthquakes: the greatest intensities generally correspond to the epicentral area, and their degree and extent (possibly augmented by knowledge of local geological conditions) can be compared with other local earthquakes to estimate the magnitude.
^"The Severity of an Earthquake". USGS. USA.gov. November 5, 2021.
and 28 Related for: Modified Mercalli intensity scale information
The ModifiedMercalliintensityscale (MM, MMI, or MCS) measures the effects of an earthquake at a given location. This is in contrast with the seismic...
type. Since then, that scale was called the ModifiedMercalliintensityscale - MMS and the evaluations of the Seismic Intensities became more reliable...
Giuseppe Mercalli (21 May 1850 – 19 March 1914) was an Italian volcanologist and Catholic priest. He is known best for the Mercalliintensityscale for measuring...
are listed according to UTC time. The maximum intensities are based on the ModifiedMercalliintensityscale. Earthquake magnitudes are based on data from...
instrument-readings. The old ModifiedMercalliintensityscale (MM), a relic of the pre-instrument days, remains useful in the sense that each intensity-level provides...
1834. It was assigned VIII (Severe) to IX (Violent) on the ModifiedMercalliintensityscale. It was preceded by a number of strongly felt foreshocks the...
moment magnitude scale and had a maximum intensity of 7 on the JMA Seismic IntensityScale (XI–XII on the ModifiedMercalliIntensityScale). The tremors...
measuring 6.7 Mww. It had a maximum perceived intensity of VIII (Severe) on the ModifiedMercalliIntensityScale. At least eleven people were killed and another...
seismometers, the Richter magnitude scale, and the ModifiedMercalliintensityscale (an updated version of the Mercalliintensityscale). In 1933, the Long Beach...
Benevento, southern Italy. Earning a level of XI (Extreme) on the ModifiedMercalliintensityscale, the earthquake caused widespread destruction in central and...
+8). It measured 7.4 Mw and had a maximum intensity of IX (Violent) on the ModifiedMercalliintensityscale. The Philippine Institute of Volcanology and...
given geographic point. The Mercalliintensityscale uses personal reports and observations to measure earthquake intensity but PGA is measured by instruments...
described using a descriptive scale like the ModifiedMercalliintensityscale or the Medvedev–Sponheuer–Karnik scale. Zone 5 covers the areas with the...
in the range 7.8–8.0 Ms and the maximum felt intensity was IX on the ModifiedMercalliintensityscale. The epicenter of the earthquake was on the southern...
The PHIVOLCS earthquake intensityscale (PEIS; Filipino: Panukat ng Pagyanig ng Lindol) is a seismic scale used and developed by the Philippine Institute...
4 on the moment magnitude scale and assigned a maximum intensity of VIII (Severe) on the ModifiedMercalliintensityscale was one of the largest to hit...
measuring 6.8 Mww. It had a maximum perceived intensity of VII (Very strong) on the ModifiedMercalliIntensityScale. At least 13 people were killed and another...
northeast of the epicentre. The maximum felt intensity was VIII (Severe) on the ModifiedMercalliintensityscale. A total of 51 people were killed in the...
maximum felt intensity of VII (Very strong) on the ModifiedMercalliintensityscale or VIII (Heavily damaging) on the European macroseismic scale. There was...
from the original (PDF) on July 30, 2013. Biography portal ModifiedMercalliintensityscale Seismicity Macroseismic magnitude Hough 2007, p. 10 Scheid...
Supplementary Service Data § Man-Machine Interface ModifiedMercalliintensityscale, an earthquake intensity measure W3C MMI or Multimodal Interaction Activity...
Richter scale becomes meaningless. The Richter and MMS scales measure the energy released by an earthquake; another scale, the Mercalliintensityscale, classifies...
States Geological Survey, with a maximum intensity assigned IX (Violent) on the ModifiedMercalliintensityscale. According to the Japan Meteorological...
Standard Time (PST). The 7.1–7.5 magnitude earthquake, with a ModifiedMercalliintensityscale rating of X (Extreme), along with its resulting tsunami, caused...
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