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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..
The Richter scale 1 ˈrɪktər also called the Richter magnitude scale Richters magnitude scale and the GutenbergRichter scale 2 is a measure of the strength of earthquakes. Richter scale M L quantitative measure of an earthquakes magnitude size devised in 1935 by American seismologists Charles F. An earthquake has one magnitude unit The magnitude does not depend on the location where the measurement is made Since 1970 the Moment Magnitude Scale has been used. An earthquakes seismic moment can be estimated in various ways which are the bases of the Mwb Mwr Mwc Mww Mwp Mi and Mwpd scales all subtypes of the generic M w scale. Magnitude is expressed in whole numbers and decimal fractions For example a magnitude 53 is a moderate earthquake and a 63 is a strong earthquake..
The Japan Meteorological Agency JMA Seismic Intensity Scale 1 known in Japan as the Shindo seismic scale 2 is a seismic intensity scale used in Japan to categorize the intensity of local. Tables explaining the JMA Seismic Intensity Scale Contents Notes Human perception and reaction indoor situation outdoor situation Wooden houses Reinforced-concrete buildings. The Japan Meteorological Agency has a unique seismic scale called shindo that measures the degree of shaking in the event of an earthquake This set of numbers ranging from 0 to 7 is. Earthquake distribution around Japan 1960-2011 Monitoring of Earthquakes and Provision of Information To monitor earthquakes JMA operates an earthquake observation network. Japan earthquake information differs from other countries in that there tremors are typically measured on a 10-step seismic intensity scale of 0 through 7 with lower and..
All scales except M w saturate for large earthquakes meaning they are based on the amplitudes of waves that have a wavelength shorter than the rupture. The 20 largest recorded earthquakes in history 1 Wrecked houses in Valdivia Chile after the 1960. Richter scale ML quantitative measure of an earthquake s magnitude size devised in 1935. Largest earthquakes by year 1938 Banda Sea earthquake A tsunami up to 2 meters high was generated without major damage. With an isoseismal map of the observed intensities see illustration an earthquakes magnitude can be estimated from both the maximum..
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