Two strong earthquakes, the first measuring 6.6 magnitude and the second 6.8  struck in quick succession off Canada's west coast late yesterday, the US Geological Survey said.<br />''  <br />'' The epicentre of the first tremor, at 10:39 pm (0549 GMT Monday), was located about 135 miles southwest of Port Hardy a small municipality on the northeastern tip of British Columbia's Vancouver Island.<br />'' <br />''<span style="color: #222222;">The second stronger quake occurred 122 miles southwest of the same town more than half an hour later, at 11:16 pm. There were no initial reports of damage or injuries, and no tsunami warnings were issued.</span><br />