Four slight intensity quakes shook the national capital in the wee hours of Tuesday, jolting many people out of bed. However, there were no reports of any casualty or damage to property. The quakes measuring 2.5 to 3.3 on the Richter scale shook the city on four occasions within a span of three hours, between 12.41 AM and 3.40 AM and the epicentre was in south Delhi. The epicentre of all the four quakes were at a depth of 10-11 KM and situated at 28.4 degree North Latitude and 77.4 degree East Longitude, Indian Meteorological Department said. The first quake, measuring 3.1 on the Richter scale occurred at 12.41 am, while three more tremors of 3.3, 2.5 and 2.8 magnitude on Richter scale occurred at 1.41 am, 1.55 am and 3.40 am respectively, the IMD official said.