NEW DELHI: Strong tremors were felt in the Delhi-National Capital Region (NCR) and other parts of north India after four earthquakes, the strongest being of magnitude 6.2 on the Richter Scale struck Nepal on Tuesday afternoon. The earthquakes occurred within a span of less an hour. The National Centre for Seismology (NCS) official said the first quake of magnitude 4.6 struck west Nepal at a depth of 10 kilometre at 2:25 pm, followed by the 6.2 magnitude jolt at 2:51 pm.Two more quakes (magnitude 3.6 and 3.1) hit...