I am currently working on '3D numerical modelling of complex host inclusion systems' for my PhD thesis. The mechanism of earthquakes below the brittle-ductile transition zone has been a long-standing mystery due to its weak rheology and high confining pressure. Under the joint supervision of Prof. Alessandro Reali & Prof. Matteo Alvaro, I am dealing with that issue by proposing an alternative theory that includes a hostinclusion system and then checking its viability through numerical simulations. So, this study will help to understand the origin of earthquakes better, it has also plausible application in Elastic geobarometry where the residual stresses can be analysed more accurately. Understanding quakes in other celestial bodies such as the moon, mars etc. where no conclusive evidence of existence for tectonic plates found, unlike earth.