Why are there so many earthquakes?

Why do the surrounding areas of Delhi often experience earthquake tremors?

Residents of Delhi-NCR experienced tremors for the third time in a month following a 6.4 magnitude erathquake that rocked Nepal. But                 in the nation's capital? 

An earthquake with a magnitude of 6.4 struck Nepal on Friday night, causing vibrations and sending inhabitants of Delhi and the neighboring territories running out of their houses in fear. This was Delhi's third earthquake in a month, and speculation about why the nation's capital has been having these kinds of events has increased.

The Bureau of Indian Standards (BIS) seismic zoning map places Delhi and the National Capital Region (NCR) in Seismic Zone-IV, which is regarded as a high seismic risk zone. A higher probability of moderate to high-intensity earthquakes is indicated by Zone IV.

WHY IS DELHI VULNERABLE TO REGULAR TREMORS AND COMES UNDER ZONE-IV?

The primary causes of this classification are Delhi's geographic location and geological activity. The nation's capital is located about 200–300 kilometers from the Himalayan mountain ranges. The ongoing collision of the Eurasian and Indian tectonic plates resulted in the formation of the Himalayas. Because of the region's ongoing tectonic activity, which causes frequent tremors, it is the epicenter for frequent natural disasters including earthquakes and landslides.

Tectonic plate movement in the topmost layer of the earth's crust is often what causes earthquakes. Therefore, the likelihood of an earthquake increases with the amount of activity in this layer.