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Although each earthquake has a unique Magnitude, its effects will vary greatly according to distance, ground conditions, construction standards, and other factors. Seismologists use a different Mercalli Intensity Scale to express the variable effects of an earthquake.
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www.seismo.unr.edu/ftp/pub/louie/class/100/magnitude.ht...
www.seismo.unr.edu/ftp/pub/louie/class/100/magnitude.html
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Using this scale, a magnitude 5 earthquake would result in ten times the level of ground shaking as a magnitude 4 earthquake (and 32 times as much energy would be released).
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www.geo.mtu.edu/UPSeis/intensity.html
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Earthquake Magnitude Scale ... Magnitude Earthquake Effects Estimated Number; Each Year ... 8.0 or greater Great earthquake. Can totally destroy communities near the epicenter. One every 5 to 10 years...
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www.geo.mtu.edu/UPSeis/magnitude.html
www.geo.mtu.edu/UPSeis/magnitude.html
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Richter magnitude scale - Wikipedia, the free encyclopedia
The Richter magnitude scale , also known as the local magnitude ( M_L ) scale , assigns a single number to quantify the amount of seismic energy released by an earthquake. It is a base...
en.wikipedia.org/wiki/Richter_magnitude_scale
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In other words, a magnitude 6.7 earthquake releases over 900 times (30 times 30) the energy of a 4.7 earthquake - or it takes about 900 magnitude 4.7 earthquakes to equal the energy released in a single 6.7 earthquake!
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www.volcanolive.com/magnitude2.html
www.volcanolive.com/magnitude2.html
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EARTHQUAKE MAGNITUDE SCALES; ... The earthquake wave displacement amplitude increases by a factor of 10 for every 1 unit increase of the Richter magnitude. The same 1 unit increase in magnitude, however, corresponds to an increase of approximately 32 times the earthquakes energy.
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www.vibrationdata.com/earthquakes/magnitude.html
www.vibrationdata.com/earthquakes/magnitude.html
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Nowadays, every earthquake magnitude scale is the Richter scale. ... These days, an earthquake happens and right away it is on the news, including its magnitude. Instant earthquake magnitudes seem as routine an achievement as reporting the temperature, but they're the fruit of generations of scientific work.
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geology.about.com/cs/quakemags/a/aa060798.htm
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The USGS Earthquake Magnitude Working Group: ... All of the currently used methods for measuring earthquake magnitude (ML, duration magnitude mD, surface-wave magnitude MS, teleseismic body-wave magnitude mb, moment magnitude M, etc.) yield results that are consistent with ML. In fact, most modern methods for...
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earthquake.usgs.gov/aboutus/docs/020204mag_policy.php
earthquake.usgs.gov/aboutus/docs/020204mag_policy.php
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