Each year, there are about a million earthquakes around the world. But only about 100 of these cause serious damage.
You would feel the ground shake in a magnitude 3 quake.
The deadliest known quake in history shook China in 1556, taking about 830,000 lives.
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.