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The Richter scale 1 ˈrɪktər also called the Richter magnitude scale Richters magnitude scale and the GutenbergRichter scale 2 is a. The Richter scale and how it measures earthquake magnitude The Richter scale calculates an earthquakes. In particular for very large earthquakes moment magnitude gives the most reliable estimate of earthquake size. Magnitude scales can be used to describe earthquakes so small that they are expressed in negative numbers. The Richter scale is a logarithmic scale that measures the magnitude of an earthquake originally developed by Charles F..
An earthquake has one magnitude unit The magnitude does not depend on the location where the measurement is. The idea of a logarithmic earthquake magnitude scale was first developed by Charles Richter in the 1930s for. The Richter scale is open-ended but most earthquakes fall between magnitudes 20 and 90. Magnitude scales can be used to describe earthquakes so small that they are expressed in negative numbers..
Although numerousintensity scales have been developed over the last several hundred years to evaluate the effects of earthquakes the one currently used in the United States is the Modified Mercalli. 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. The Mercalli Scale is based on observable earthquake damage From a scientific standpoint the magnitude scale is based on seismic records while the Mercalli is based on observable data. Felt by a few people especially on upper floors Noticeable indoors especially on upper floors but may not be recognized as an earthquake Felt by many indoors few outdoors. The Mercalli Scale The Mercalli scale has 12 divisions using Roman numerals from I to XII Not felt except by a very few under especially favorable circumstances..
Earthquake Intensity - Modified Mercalli Intensity MMI Scale. These are distinguished from seismic intensity scales that categorize the intensity or severity of ground shaking. The Modified Mercalli intensity scale MM MMI or MCS measures the effects of an earthquake at a given location..
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