A dangerous situation

I remember that was a Sunday in 2006, I was doing my homework in my room.Suddenly, I felt the house began shaking, but just once and very slight, I was very strange, what's happened? So I went to my mother room and asked she weather felt shook. Than the house were shaking again. At that time, my mother said:" ran, that was earthquake." . What？Earthquake! Oh my god! My mum and I was running up to the downstairs immediately, and saw all people in there. We has stood more than an hour in outside and went home until the house haven't shaken. In fact, that day the house just shook twice and very slight.