How many earthquakes have there been in 2010?
On average, there are roughly 20,000 - 30,000 recorded earthquakes every year. There were 21,546 recorded earthquakes in 2010 around the world according to the USGS. Note many go undetected because they hit remote areas or have very small magnitudes so the actual numbers are much greater.
You can visit the site below to see lists on recorded earthquakes in the year 2010 as well as past years.
The list of earthquakes by year (1990-Present) or by country can be found at the USGS Earthquake Hazards Program website. In 2010 there was one earthquake magnitude 8 or greater, which was in Chile (M 8.8). The USGS provides a list of significant earthquakes for 2010 as well as a worldwide map of earthquakes for 2010 and previous years.
It is impossible to determine how many earthquakes there have been throughout history. Earthquakes occur frequently all over the earth, including deep under the ground. Many of these may not be felt by people and barely register on scientific equipment, but they are still earthquakes. There are generally a few dozen earthquakes EACH DAY. See the link for the last 7 days earthquakes. 12
The 8.8 magnitude earthquake in Chile and two 7.8 earthquakes in Indonesia were the most significant in 2010. List of earthquakes by year or by country can be found at the USGS Earthquake Hazards website. It provides a list of significant earthquakes for 2010 as well as a worldwide map of earthquakes for 2010. See link below.