<image from iris.edu as of March 18, 2012>
But according to the estimates of US Geological Survey (USGS), there are several million earthquakes happening in the world per year. Many earthquakes are not detected because they have small magnitudes or the place where the earthquake occurs has no seismographs installed. (Seismographs are electronic instruments used to measure seismic waves or earthquakes). As more seismographs are installed around the world, more earthquakes can be identified. So, the 50 daily earthquakes that have been located by NEIC will increase as more seismographs are installed in more areas.
According to the USGS National Earthquake Information Center, from year 2000 to 2012, the highest number of earthquakes occurred in year 2008, having 31,777 total number of earthquakes. The year with the highest number of deaths due to earthquake is year 2010, having approximately 320,120 people have been killed. On that year 2010, Haiti experienced the 6th deadliest earthquake (7 magnitude) in recorded history which killed up to 230,000 people.