Abstract:
are one of nature greatest hazard to life’s and property which could cause intense shaking at the earth’s surface and have the potential to cause huge socio-economic losses. The rapid growth of population, urbanization and poor construction practices in high-risk zones level of risk will have a significant impact, the assessment of earthquake’s risk will help to visualize the consequences and potential socio-economic losses and helps to decide what to be planned.
In this study, Probabilistic Seismic Hazard Assessment (PSHA) of North East India has been carried out, the study area lies between 20°-28°N latitudes and 87°-96°E longitudes which have been divided into seven seismogenic source zones and considering whole earthquake data and data within completeness period seismicity parameters have been estimated. The probability of exceedance of a particular earthquake has been estimated for various source zones considering 25, 50 and 100 years and the result has been represented in the form of figures. Corresponding to seismicity parameters obtained from data within completeness period, for various return periods at different cities of North East India, seismic hazard has been estimated in terms of PGA considering Boore and Atkinson (2014), Abramhamson, Silva and Kamai (2014) and Campbell and Bozorgnia (2014) NGA attenuation models. Mean PGA contour map for 475 and 2475 year return period has been plotted correspond to various attenuation models. For risk assessment, Aizawl( Capital of Mizoram) has been considered as study area, for this, census of India 2011 has been used for demographic and building data and estimates possible minimum and maximum earthquake risk in terms of socio-economic losses for various RD Blocks in Aizawl, loss has been computed using an open software toll named Seis-VARA Spectrum considering computed PGA value at Aizawl. Considering 1869 (Cachar earthquake) and 1897 (Assam earthquake) as a scenario event potential loss and probability of occurrence of these earthquakes have been estimated. The results of loss assessment indicate that the study area could face significant losses and a future repeat of these past earthquakes could be disastrous and needs to be prepared.
