Vol. 3, Issue 3 (2016)
Increasing vulnerability of building stocks of Gangtok Town, Sikkim (India): An Issue and challenges for local people after Earthquake of 18th September 2011
Author(s): Passang Tamang
Abstract: Earthquake is a disastrous/hazardous event, cause after the trembling of earth, which may claims lives, property and destruction of the environment. Earthquake may cause due to movement of plate apart or collision of plates or subduction / override of two or more plates. Gangtok, a capital town of Sikkim is located in high intensity zone-IV in hazard zonation map of India. The Main Central Trust (MCT) fault line, as the earthquake or volcanic active zone passes through the area is considered for high seismic zone of India. Sikkim (Gangtok) lies in young-fold Himalayan belt, which is still rising due to collision of two giant plates i.e. Eurasian and Indo-Australian plates. Geologically, area is not much stable composition of Phyllites, Gneiss and Schist which are sensitive to bear the strong shaking of ground surface. The alarming growth rate of population and rapid construction of multi-stores buildings in past last decades may pose serious threat of risk in Gangtok Town. The rapid growth of population and haphazardly construction of houses, buildings and increasing numbers of urban population particularly developing countries including India needs primary concern to assessment of buildings before occurrence of any major disastrous events like earthquake. The alarming growth rate of population and rapid construction of multi-stores buildings in past last decades in small and big towns of India may pose serious threat of vulnerability for further earthquake.