The United States Geological Survey estimates that there are around 50 earthquakes per day in the world that can be located. This amounts to around 20,000 earthquakes annually.
Many earthquakes are undetected by the USGS; in fact, the organization estimates that around several million earthquakes occur around the globe annually. Annually, an average of one earthquake of a magnitude 8 or higher occurs, while around 15 earthquakes ranging from 7 to 7.9 occur. As many as 1.3 million earthquakes measuring 2 to 2.9 in intensity occur annually. This information is based on observations of data from the year 1900 and beyond.