What is the reason for frequent earthquakes?( earthquakes)

Delhi: Strong earthquake tremors were felt in the National Capital Region Delhi NCR today. This is the second incident of earthquake ( earthquakes)  in NCR within 15 days. Earlier on Sunday, an earthquake of 3.1 magnitude had occurred in Faridabad, Haryana. At the same time, tremors of earthquake of 6.2 magnitude were felt in Nepal on 3 October, today i.e. on 15 October.
Delhi is quite unique in terms of earthquakes. Since earthquakes occur in the Himalayan regions every 3-4 months, the earth here also shakes. The epicenter of the earthquake that occurred in Delhi today was in Faridabad, 9 km east and 30 km south-east of Delhi.
But what is the reason for so many earthquakes in these areas? How does NCR become such an earthquake prone area? What is the reason? In how active seismic zone is India located? Answering all the questions – OP Mishra, Director of the National Center for Seismology of the Ministry of Earth Sciences.

Reason for earthquake?
Our Earth is made up of 7 major plates, apart from these there are many smaller plates also. These plates continuously move beneath the earth’s surface. These pulls or collisions cause vibration on the earth, which is called earthquake. According to the National Disaster Management Authority, earthquakes occur without any warning.

Earthquakes are tectonic in origin, meaning that moving plates are responsible for their occurrence and shaking. Earthquakes can cause loss of lives in densely populated areas and cause massive damage to public and private property. This is especially true for India, as its growing population and largely developing country brings it at considerable risk.

What does India’s seismic activity look like?
NDMA says more than 59 percent of India’s land area is “at risk of moderate to severe seismic hazard.” The entire Himalayan region is considered vulnerable to earthquakes of magnitude greater than 8.0 and, over a period of about 50 years, has experienced four major earthquakes: 1897 Shillong (magnitude 8.7); 1905 Kangra (intensity 8.0); 1934 Bihar-Nepal (intensity 8.3); and 1950 Assam-Tibet (intensity 8.6).
How the total landmass of India is divided into seismic zones:-

Zone V: 11% (most active)Zone IV: 18%Zone III: 30%
Zone II: 41% (least active)

Delhi is included in Zone IV
As everyone knows, the Himalayas are a newly folded mountain range. This plate tectonic activity continues continuously. Due to which the height of Mount Everest, the highest in the Himalayan Mountains, is increasing. The Indian and Nepal plates collide with each other, due to which earthquakes are experienced frequently in these areas.
The area of Delhi-NCR also comes in the Himalayan zone. This area falls in Seismic Zone IV of India, where the risk of earthquake is very high. Therefore, earthquakes of magnitude 4 to 4.5 are quite common in these areas, but.. Faridabad falls in 7 plate zone i.e. Zone V, if ever the epicenter of an earthquake is here then it would be a disaster. In the last 100 years, 25 to 30 such earthquakes have occurred in Delhi, in which there has been no significant damage.

These are the major fault or seismic zones in Delhi

Delhi-Haridwar RidgeMahendragarh-Dehradun Subsurface FaultMoradabad FaultSohna FaultGreat Boundary Fault

Yamuna River LineamentGanga River LineamentJahajpur Thrust
Experts said the Aravalli range of mountains stretching between Delhi and Udaipur and passing through the hilly terrain through Gurugram, Jaipur and Ajmer has seen extensive geological activity, leading to uplift and formation of faults in these mountains, But, currently no activity has been seen in them.