United States - number of earthquakes by magnitude 2005-2012

This statistic shows the number of earthquakes in the United States from year 2005 to 2012, by magnitude. In 2005, 1,475 earthquakes with a Richter magnitude scale between 3.0 and 3.9 were recorded in the United States.

Number of earthquakes in the United States from 2005 to 2012, by magnitude

Characteristic	2005	2006	2007	2008	2009	2010	2011	2012
8.0 to 9.9	0	0	0	0	0	0	0	0
7.0 to 7.9	1	0	1	0	0	1	1	0
6.0 to 6.9	4	7	9	9	4	8	3	5
5.0 to 5.9	47	51	72	85	58	83	51	27
4.0 to 4.9	345	346	366	432	288	638	347	271
3.0 to 3.9	1,475	1,213	1,137	1,486	1,492	3,586	1,838	1,236
2.0 to 2.9	1,738	1,145	1,173	1,573	2,379	4,130	2,941	2,251
1.0 to 1.9	2	7	11	13	26	39	47	43
0.1 to 0.9	0	1	0	0	1	0	1	0
No magnitude	73	13	22	20	14	12	8	3

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Release date

September 2013

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Region

United States

Survey time period

2005 to 2012

Supplementary notes

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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