Three powerful earthquakes, as well as several smaller ones, struck late Sunday and early Monday off the coast of British Columbia, Canada, near Vancouver Island, the U.S. Geological Survey is reporting.

According to the USGS, the first quake – magnitude 6.6 – hit about 10:39 p.m. PDT about 135 miles (218 kilometers) southwest of Port Hardy, Canada. It occurred at a depth of about 6.8 miles (11 kilometers).

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Less than 40 minutes later, a second quake with a recorded magnitude of 6.8 struck nearby, about 122 miles (197 kilometers) southwest of Port Hardy. It occurred at a depth of about 6.2 miles (10 kilometers.)

A third 6.5-magnitude quake was reported at 11:22 p.m. PDT about 138 miles (223 kilometers) southwest of Port Hardy. Its depth was also about 6.2 miles (10 kilometers).

Several smaller quakes followed, including a 4.9-magnitude temblor at 11:36 p.m. PDT.

No damage or tsunami warnings have been reported.