Essay On Seismic Microzonation

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CHAPTER – 2
SEISMIC ZONATION AND MICROZONATION
2.1. INTRODUCTION
India being a large landmass is particularly prone to earthquakes. Many disastrous earthquakes are experienced in the last decade in various parts of the Indian subcontinent. The distribution of the earthquakes occurrence is non-uniform throughout the country. The collision on the plate boundary between the Indian and Eurasian plate leads to the major earthquakes in India. The earthquakes are almost regular in the places in the northern, the northeastern and the northwestern part of India. But in the southern India the occurrence of earthquake is irregular. The Himalayan Frontier is seismically one of the most active regions of the world. The intensity and frequency of earthquake occurrence is not same in throughout the country. It varies depending upon the various factors such as geology, tectonics, soil types etc. Hence, it is very essential for classifying the entire country into different zones based on the seismicity of the
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The International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE, 1999) suggested some recommendations for seismic microzonation procedures. This paper examines the different methodologies and input data which are following the recommendation for the seismic microzonation. The different methodologies and basic principles presently used for the seismic microzonation map preparation are discussed in this paper. She concluded that by adopting the microzonation it is possible to carry out hazard related land use management which is very effective for reducing the seismic risk of an area. To perform the microzonation the inputs are required from various engineering fields such as geotechnical engineering and engineering geology. Nowadays various administrations are taking necessary steps to include seismic microzonation maps in their seismic codes, planning proceedings,

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