Special report: Frequent tremors in Delhi-NCR indication of a bigger crisis?

Delhi-NCR region has experienced 14 earthquakes in almost the last two months. Although the tremors in these earthquakes were minor and no loss of life or property took place, it does increase the concern of people living in the air when the ground shakes that often. To add the worries, Delhi comes under Zone 4 when it comes to the Earthquake Risk Zones of the country, putting it at considerable risk. So, why is the Delhi witnessing jolts so frequently and how concerned should we be?