An earthquake measuring 6.6 on the Richter scale shook Canada's Pacific coast on Friday, the US Geological Survey reported, but caused little or no damage. The temblor stuck some 280 kilometres west of Vancouver, site of the 2010 Winter Olympics, causing lights to sway at the Vancouver airport. Residents of Seattle, Washington, reported feeling tremors, but no damage was reported, according to a report of the German Press Agency "DPA"