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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.
That gave the Mercalli Scale, as well as the European MSK-64 scale that followed, a quantitative element representing the vulnerability of the building's type. [10] Since then, that scale has been called the Modified Mercalli intensity scale (MMS) and the evaluations of the seismic intensities are more reliable.
The first, six-level intensity scale was proposed by Egen in 1828 for an earthquake in Rhineland. [ 4 ] [ 5 ] Robert Mallet coined the term "isoseismal" and produced a map for the 1857 Basilicata earthquake with a three-fold intensity scale and used this and other information to identify the epicentral area (a term he also coined). [ 6 ]
2 Supported scales. Toggle the table of contents. ... This template allows for Modified Mercalli intensity scale seismic intensities to be displayed and colored.
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Unlike the Richter and moment magnitude scales, it is not a measure of the total energy (magnitude, or size) of an earthquake, but rather of how much the earth shakes at a given geographic point. The Mercalli intensity scale uses personal reports and observations to measure earthquake intensity but PGA is measured by instruments, such as ...
The magnitude/intensity comparison table in the Mercalli intensity scale#Modified Mercalli Intensity scale section makes it appear as though magnitude and intensity are directly comparable, when in reality, the magnitude (number) necessary for a certain intensity is frequently lower than the intensity (number) of the shaking it produces. An ...
The old Modified Mercalli intensity scale (MM), a relic of the pre-instrument days, remains useful in the sense that each intensity-level provides an observable difference in seismic damage. After many years of trying every possible manipulation of accelerometer-time histories, it turns out that the extremely simple peak ground velocity (PGV ...
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