Delhi is the capital of India and has experienced frequent earthquakes, especially in recent times (following the Nepal earthquake in 2015). One of the reasons is the proximity of Delhi to the Himalayas. These mountains are a result of the Indian plate pushing the Eurasian plate. This tectonic movement causes earthquakes. India is divided into 4 seismic zones and Delhi lies in zone IV (regions highly vulnerable to earthquakes).
Delhi also lies over three fault lines and is in the vicinity of other major fault lines. These geologic features (fault lines) are associated with seismic activity and their presence near Delhi makes it vulnerable to major earthquakes.
Given the city's high population density, amount of tall buildings, and general poor construction practices, a major earthquake in Delhi could potentially result in the loss of millions of lives.
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