Re: Earthquake in Karachi
If Clifton and Defense areas are on the other side of a major fault, only then it is possible to feel the shock there and not in other part of the city. I know for a fact that the Sourthern portion of Sindh is highly faulted and fractured. I am unaware of any major fault planes crossing right across Karachi, though.
However, this being said, people living in flats/high rise buildings will feel the tremors more than others.