These are known as magnitude scales.
The Moment magnitude scale (abbreviated as MMS; denoted as MW) is used by seismologists to measure the size of earthquakes in terms of the energy released.
The US Geological Survey assigns MMS figures to most earthquakes, but news reports may still refer to the Richter scale, the familiar earlier scale that was superseded by the MMS.
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Richter scale
The rating system used to estimate the total energy released by an earthquake is the Moment Magnitude Scale.
Geologists use the Moment Magnitude Scale, a rating system that estimates the total energy released by an earthquake. The Moment Magnitude Scale can be used to rate earthquakes of all sizes, near or small.-Source is from Prentice Hall: Science Explorer Earth Science textbook page 158 Ch. 5: Earthquakes
They use the Richter scale to measure magnitude and Moment Measure to measure energy released.
The magnitude varies depending on the magnitude and terrain and it doesn't tell you how much damage was caused or how far it reach. There are also aftershocks as well which aren't mentioned in the magnitude.
actually, the highest rating was an earthquake in Chili, coming in on a 9.5
The Richter Scale is used to rate the magnitude of an earthquake -- the amount of energy it released. This is calculated using information gathered by a seismograph. The Richter Scale is logarithmic, meaning that whole-number jumps indicate a tenfold increase.In this case, the increase is in wave amplitude. That is, the wave amplitude in a level 6 earthquake is 10 times greater than in a level 5 earthquake, and the amplitude increases 100 times between a level 7 earthquake and a level 9 earthquake. The amount of energy released increases 31.7 times between whole number values.
Energy star rating is a rating fiven to products to rate them on their energy consumption. The lower the energy star rating the less energy it uses.
The rating was 9.0, which is almost complete destruction.
8.9 on the Richter scale.