New Delhi, Feb. 18 -- The magnitude 4.0 earthquake that jolted Delhi awake early on Monday had its epicentre under the Jheel Park in southwest Delhi's Dhaula Kuan and experts believe the nature of the rocks deep inside the ground - roughly 5km, where the temblor originated - hold the key to understanding the unusual event.
A preliminary analysis by National Center for Seismology (NCS) said at fault was a weak zone in the earth's crust, a feature known as "lineament", different - and notably, less worrying - than a fault line. "A lineament is basically a weak zone. These lineaments can become fault lines in future but at the moment it is a weak zone," said OP Mishra, director at the NCS.
Mishra added that the origin of the weak zone likely...