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LITERATURE SURVEY OF AVAILABLE EARTHQUAKE HAZARD ASSESSMENT STUDIES RELATED TO NORTH EASTERN REGION (2015)
The Northeast India region is one of the most active zones in the world; the region is jawed between the two arcs, the Himalayan arc to the north and the Indo-Burmese arc to the east. The region bounded by latitude 22-290N and longitude 90-980 E, produced two great earthquakes (M> 8.0) and about 20 large earthquakes (7.0>M>8.0) since 1897. The Shillong Plateau was the source area for the 1897 great earthquake M 8.7, and the Assam Syntaxis zone for the 1950 great earthquake M 8.6. Several large earthquakes occurred along the IndoBurma ranges. Earthquake is only natural disaster, which cannot be predicted till now and may occur at any time and pre-planned strategies for rescue of life and property are not possible and hence causes maximum devastation than other natural disaster. So, earthquake disaster mitigation and responses takes an important role to reduce the destruction of life and property. A mitigation strategy is one of the prime concepts in order to reduce the hazard. This includes land use regulations, seismic construction and retrofit codes, improved engneering practices and simultaneous basic research on earthquake seismology. Effective mitigation will result in the avoidance of many losses that could result from future earthquakes. Additionally, although mitigation measures do provide considerable protection, one of the key features of earthquake disasters is that they produce unanticipated impacts that overwhelm the coping capacities of affected social units. Task force group constituted by Assam State Disaster Management Authority (ASDMA), Dispur, Guwahati, Assam recommended for preparing basic reference document by launching literature survey of available earthquake hazard assessment and mitigation related studies in Northeastern region for finding out what is available and the gaps if any. Pertaining to future research program towards earthquake mitigation aspect, this survey would frame a benchmark for future further research program. Several workers worked on various research topics related to earthquake seismology which delivered the prime input to the earthquake hazard mitigation approach in Northeastern India. However, the studies may lack some of the crucial inputs which still remain unexplored. These inputs are yet to be ascertained. Incidentally, this survey will portray the status of present scenario on earthquake hazard mitigation related studies and the gaps if any available.
ASSAM STATE DISASTER MANAGEMENT AUTHORITY GOVT. OF ASSAM GUWAHATI 2015
CSIR - NORTH-EAST INSTITUTE OF SCIENCE AND TECHNOLOGY