For the second time in less than a week, an earthquake has struck off the west coast of Vancouver Island.

The 4.0-magnitude quake struck at 4:02 a.m. local time, 91 kilometres west of Gold River, B.C. It hit at a depth of 25 kilometres under the earth's crust.

The U.S. Geological Survey said there are no reports of Thursday's shake causing any injuries or damage.

"This is likely an aftershock of the magnitude 6.3 earthquake of Friday, Sept. 9. There are no reports of damage, and none would be expected," said a statement from the USGS.

The quake is one of six recorded between midnight and just after 4 a.m. along the west coast of North America from Alaska to Baja, Mexico.

None of the quakes were large enough to generate a tsunami.

B.C.'s latest quake comes just six days after a 6.3-magnitude shaker hit in the same location off of Vancouver Island.

That jolt was felt all the way to the province's Interior. It spawned more than 100 aftershocks, ranging from magnitude 4.9 down to as low as magnitude 1.

For information about earthquake preparedness, visit B.C.'s Provincial Emergency Program website.