Earthquake!!

So, apparently there was an earthquake in Seoul here this evening. Why didn't I notice??? It happened around 6, so maybe I was in the taxi or in an elevator at the time. I've read it measured 3.3 and was centered just southwest of Seoul in Siheung, Gyeonggi province. I onlyr recently read in this not so old article that Seoul is SO not prepared for any major earthquakes. Luckily this one wasn't major.