"Earthquake" in city

Singapore experiences the tremors of an earthquake (neighbouring) again. It was so bad that I sat on my chair and felt as if I had a giddy headache and was going to faint anytime. Suntec security finally called for an evacuation as my office tower is 27-storey high, but geeezz they didn't make any announcement. My colleague rang me up to ask me flee the building. Sigh, how come I am still feeling giddy (I almost typed 'diggy')...