An earthquake measuring 4.0 on the richter scale hit Delhi-NCR this morning with many residents rushing out of their houses. According to National Centre for Seismology, tremors were felt across north India, with Delhi as the epicentre. The depth of the quake was just 5 km. So far there are no reports of injuries or casualties. The strong tremors triggered by the earthquake prompted residents of several high-rise buildings in Delhi, Noida, Greater Noida and Ghaziabad to rush out.