Each year, there are about a million earthquakes around the world. But only about 100 of these cause serious damage.
Sometimes there are many small earthquakes before the big one. These small ones are called foreshocks. After the big earthquake, the mainshock, again there may be many small quakes. These are called aftershocks.
You may not notice a magnitude 2 quake.
Most earthquakes happen along the edges of Earth's big plates.