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Earthquakes

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Published: 1998
Language: English
Wordcount: 5,255 / 24 pg
Flesch-Kincaid Reading Ease: 45.8
Downloads: 813
Added to site: 2014.11.14
mnybks.net#: 31820
Origin: gutenberg.org
Genre: Non-fiction
Excerpt

/em>, is a measure of the amplitude of the seismic waves. The moment magnitude of an earthquake is a measure of the amount of energy released--an amount that can be estimated from seismograph recordings. The intensity, as expressed by the Modified Mercalli Scale, is a subjective measure that describes how strong a shock was felt at a particular location.

The Richter Scale, named after Dr. Charles F. Richter of the California Institute of Technology, is the best known scale for measuring the magnitude of earthquakes. The scale is logarithmic so that a recording of 7, for example, indicates a disturbance with ground motion 10 times as large as a recording of 6. A quake of magnitude 2 is the smallest quake normally felt by people. Earthquakes with a Richter value of 6 or more are commonly considered major; great earthquakes have magnitudes of 8 or more on the Richter scale.

The Modified Mercalli Scale expresses the intensity of an earthquake's effects in a given locality

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