A powerful earthquake measuring 7.2 magnitude struck Tajikistan today, shaking buildings as far away as in New Delhi and other parts of north India.The epicentre of the quake was 111 kilometres (65 miles) southwest of Karakul and at a depth of 28.7 kilometres, the US Geological Survey said. According to the National Seismological Division of the Ministry of Earth Science, the earthquake hit Tajikistan at 1.20 PM (IST).