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Title: Assessment of seismic risk in a microzone
Authors: Gupta, Ila
Sinvhal, Amita
Keywords: Hazard
Micro Zone
Narendra Nagar
Issue Date: 2010
Publisher: Department of Earthquake Engineering,IIT Roorkee
Series/Report no.: 14th Symposium on Earthquake Engineering
Abstract: Seismic risk of any region can be determined from its hazard and vulnerability. Himalayan ranges are characterized by high seismic hazard and high vulnerability of settlements due to various seismo tectonic and socio-economic factors. Seismic micro zone coinciding with Narendra Nagar block of Tehri district of Uttarakhand was selected for assessment of earthquake risk. The region displayed high earthquake hazard as it is infested by the Main Boundary Fault (MBF) which manifests as several large tectonic elements (Tons Nayar Thrust, Krol Thrust and Garhwal Thrust) in the region. It is also situated within the most vulnerable seismic micro zone identified for the region. It was observed that almost 31% of block population was located in the most vulnerable seismic micro zone. Residential structures of Narendra Nagar block, when classified into three vulnerability categories, as per descriptions provided by the MSK Intensity scale, revealed that almost 26% residential structures fell in the most vulnerable category. Hence, it was observed that the population of Narendra Nagar block is at high risk due to earthquake hazard, along with high vulnerability of residential structures. Risk was quantified by developing a hypothetical earthquake scenario within the selected region. The disastrous effect of an earthquake was estimated in terms of residential structures and human lives. It was found that almost 25% residential buildings would experience high damage or total collapse while 32% more would experience moderate damage. As a result of this, 0.96% of total population (990 persons) would be dead or unsavable, whereas an additional 1.44% (1484 persons) would face life threatening injuries. Such alarming figures demonstrate the high earthquake risk to which the population is exposed. Hence, planning of disaster mitigation activities involving risk reduction plan, preparedness plan and action plan and implementation of the same are needed on an urgent basis.
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