Seismicity variation along with crustal heterogeneity using natural source is of prime interest in advance research nowadays. In the global scenario, North-East India is one of the prominent seismicity active zone characterized by its tectonically complex set-up. The seismicity study area encompasses between $\rm{18^{\circ}–32^{\circ}N}$ latitude and $\rm{88^{\circ}–102^{\circ}E}$ longitude, which basically locates the Shillong plateau and its surrounding in north-east part of India. Here, we have attempted to forecast the seismicity pattern as well as the crustal heterogeneity for Shillong plateau in north-east part of India. In this regard, we have used the most basic seismicity parameter like $b$ value and fractal correlation dimension ($D_{c}$) along with focal mechanism characteristic over the entire region of study. The correlation experiment between the lower $D_{c}$ value and $b$ value indicates the possibility of an earthquake of large magnitude in the south central Burma basin and Shillong plateau region. Various dynamic faults and associated seismicity spread over all around the North-East India supports the possible rejuvenation of pop-up structure for Shillong plateau. We have tested our proposed method on real dataset, presented and analysed our experimental results and compared it with other methods and the overall results are found to be satisfactory.