| Magnitude | Number of eartquakes |
|---|---|
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
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Source
Source
Release date
September 2013
More information
Region
United States
Survey time period
2012
Supplementary notes
Number of earthquakes in the U.S. in 2012 in total: 3,836.
The expression "Richter magnitude scale" refers to a number of ways to assign a single number to quantify the energy contained in an earthquake.
In all cases, the magnitude is a base-10 logarithmic scale obtained by calculating the logarithm of the amplitude of waves measured by a seismograph. An earthquake that measures 5.0 on the Richter scale has a shaking amplitude 10 times larger and corresponds to an energy release of v1000 ˜ 31.6 times greater than one that measures 4.0.
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