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Appraisal on recent seismicity in delhi and surroundings

T.G. Sitharam and Sreevalsa Kolathayar

Paper No.: 557

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Vol.: 57

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No.: 3

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September, 2020

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pp. 151-161

Abstract

 

Recently, more than 25 earthquake tremors were felt in Delhi during the last two months, which have caused panic amongst the people. This article makes an attempt to review the seismicity of Delhi and surrounding areas in the context of past studies. In view of the seismic history of Delhi, the occurrence of minor earthquakes in the vicinity of Delhi is not a very unusual phenomenon. There are several reports indicating small magnitude earthquakes occurring in and around Delhi in the past as well. The seismotectonic of Delhi region indicates the presence of several intraplate lineaments and faults in the region. But it is unlikely to have epicentre of a large magnitude earthquake event in the vicinity of Delhi. However a large magnitude event in the Himalayan plate boundary, though far away, can shake Delhi due to site effects. Three-fourth of Delhi is covered by alluvial soil because of Yamuna River, and it can amplify seismic waves. Natural hazards like earthquakes cannot be prevented. The main reason for India being more prone to these serious effects of earthquakes is because of this high density of population and poor construction quality of our habitat buildings. There is no need to panic. It is important to consider the seismic safety factors in new construction and retrofit existing structures to resist earthquake shaking in future. The awareness of earthquake-resistant design and earthquake preparedness is too important for the country.
Keywords: Earthquakes, Delhi, Himalaya, Seismicity, Risk

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