Use of NONEL can considerably reduce ground vibrations while blasting.

Please read on :

http://dspace.nitrkl.ac.in/dspace/bitstream/2080/1391/1/paper-intl-seminar.pdf

A good way is to ensure that your timing of the round is such that you do not have holes initiating at the same time. You can also consider using a system of deck charging. depending on the hole length you can split into two or three seperate charged areas and then set that of in sequence.

Another way to reduce the vibrations is to charge with a lower density explosives