A strong earthquake measuring 6.8 on the Richter Scale hit off the Pacific Island of Tonga this morning. The quake, occurred at 01:47 a.m. (local time) and was centered 135 km east-northeast of the Tongan capital Nuku'alofa at a depth of 61 kilometre. There were no immediate reports of damage or injuries. No Tsunami warning was issued. The US Geological survey said waves were possible within 100 km of the earthquake's epicenter.