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The Richter scale determines earthquake magnitude by measuring how much the ground moves, and the Modified Mercalli Intensity Scale determines earthquake intensity based on damage to buildings and effects on humans.
Richter scale, Modified Mercalli scale, Centigrade scale, and the Moment Magnitude scale
The Modified Mercalli Scale
Earthquake scales that take into consideration the damage caused by an earthquake are known as intensity scales. Examples include the The Modified Mercalli Intensity Scale and the Macroseismic Scale.
This depends on what they are trying to measure. If they are interested in the amount of energy an earthquake produces (magnitude), then they will make an initial measurement using the Richter magnitude scale. If it is a large earthquake (greater than 8.0) they will use the moment magnitude scale. If they are interested in the damage caused by an earthquake and the level of ground shaking in a specific area they will use an intensity scale. The most commonly used intensity scales are the Modified Mercalli scale, the European Macroseismic scale, the Japan Meteorological Agency seismic intensity scale, in India, Israel, Russia and throughout the CIS they use the MSK-64 scale and in China, the China Seismic Intensity Scale. These are all conceptually similar to the Modified Mercalli scale.
An earthquakes intensity
Yes, the Modified Mercalli Intensity (MMI) scale is still used today to measure the intensity of earthquakes based on observed effects on people, buildings, and the environment. It provides a valuable complement to seismic magnitude scales in assessing the impact of earthquakes on society.
The Modified Mercalli Intensity scale is used in the US to determine the severity of earthquake effects. Intensity ratings are in Roman numerals, I - meaning no people felt movement, all the way up to XII - where almost everything is destroyed.The amount of structural and geological damage done by an earthquake in a specific location determines an earthquake's intensity on the Mercalli scale. :)
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11
The Modified Mercalli Intensity scale is used in the US to determine the severity of earthquake effects. Intensity ratings are in Roman numerals, I - meaning no people felt movement, all the way up to XII - where almost everything is destroyed.The amount of structural and geological damage done by an earthquake in a specific location determines an earthquake's intensity on the Mercalli scale. :)
The maximum measured intensity of the 2010 Canterbury earthquake in New Zealand was IX (9) on the Modified Mercalli scale.
The Rickter (RICK-tur) scale has been popular for decades to measure the intensity of earthquakes, yet it had its issues. These days the Mercalli scale is most often used by geologists and vulcanologists.
Rutlage J Brazee has written: 'Reevaluation of Modified Mercalli Intensity Scale for earthquakes using distance as determinant' -- subject(s): United States, Seismometry, Earthquakes
The Richter scale determines earthquake magnitude by measuring how much the ground moves, and the Modified Mercalli Intensity Scale determines earthquake intensity based on damage to buildings and effects on humans.
considerable damage
According to the US Geological Survey, the 1906 earthquake reached a maximum intensity of 9 on the Modified Mercalli Intensity scale.