Seismic isolation system is an appropriate method for seismic design in a great many of the earthquake-prone regions around the globe. Every seismic isolation system effectively separates the building from the horizontal components of earthquake. The primary objective of the seismic isolation system is the transferring of the main frequency of the building to a span away from the earthquake frequency domain through providing it with sufficient horizontal flexibility. Large displacements in the isolation system causes reduction in the seismic forces transferred to the superstructure. There are numerous studies carried out in regard of seismic isolation. But, a comprehensive study of the studies and investigation of the results are yet to be conducted. The current paper reviews the seismic isolation studies covering two general sets of studies, namely studies on the isolated structures and the studies on the isolation systems’ components. The effects of various parameters of structure and isolation system are discussed and an analysis will be presented of the information extant in various texts. General conclusions have been made even with the scattered and different nature of the data extant in the various studies reviewed.
