Soil liquefaction and associated geotechnical concerns such as ground deformations & loss of bearing capacity have been a major source of damage to several infrastructures (e.g., 1964 Alaska earthquake, 1995 Kobe earthquake, 2001 Bhuj earthquake). Mitigation of liquefaction requires implementation of suitable ground improvement technology by means of either densification and/or reinforcement. Vibro stone columns have emerged as a reliable ground improvement technique for stabilizing weak and loose soils. When it comes to silty sand, the performance of stone columns takes on added significance. Silty sand is characterized by percentage of fines content mixed with sand, making it susceptible to settlement and instability. This article explains how vibro stone columns perform inter column densification due to installation process. Degree of ground improvement via stone columns installation depends on three factors, in case of silty sand. The first one is introducing stiffer aggregate columns in the loose soil i.e., reinforcement effect, the second is inter-column densification during thes installation process and the last one is drainage during an earthquake to impede the excess pore pressure. A series of penetration tests were conducted both before and after ground improvement at two site locations. These tests aim to elucidate how the fines content and gradation of the in-situ silty soil influences the inter-column densification effect.