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Strictly speaking the answer is "infinite." The smaller the earthquake magnitude, the more frequent they are and the harder they are to detect. There are scads of tiny earthquakes barely big enough to detect, and probably far more that are even smaller.

As a practical matter hardly anybody's going to notice anything smaller than magnitude 4 or so.

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10y ago
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9y ago

According to the United States Geological Survey, more than 3 million earthquakes happen each year. That's one earthquake every 11 seconds! Obviously, many of these earthquakes have little or no effect on human civilization - most are too weak to notice, and many others occur in completely uninhabited places, where there is no one around to feel them. However, every year, at least a handful of earthquakes occur in populated areas and cause death and destruction.

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10y ago

Between 2000 and 2012 the average number of earthquakes in just the US was 3,820 per year that are magnitude 2.5 or higher as reported by the U.S. Geological Survey (USGS) National Earthquake Information Center.

The total count is much higher because many go undetected because they hit remote areas or have very small magnitudes.

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12y ago

There are always little earthquakes that are not noticed, but all the equipment does. Its a very large number, but people only pay attention to the major earthquakes.

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Q: How many earthquakes occur in the US every year?
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