Bang, Bang, Bang! M6.6, M6.8 and M6.5 earthquakes hit offshore Vancouver Island, Canada, near Cascadia Subduction Zone within 40 minutes


Three earthquakes with magnitudes larger than M6.0 (M6.6, M6.8 and M6.5) hit off Vancouver, Canada, near the Cascadia Subduction Zone… And that in only 40 minutes! Although very shallow there is no tsunami risk.

The strong quakes are likely due to horizontal strike-slip faulting on the Sovanco transform fault that offsets the Juan de Fuca Ridge. The quake was not in the Cascadia subduction zone.

The series of strong quakes started at 5.39am UTC (10.39pm local time) with a M6.6 quake 218km SW of Port Hardy, Canada and reported by at least 40 people on the USGS homepage.

M6.5 earthquake vancouver island bc, M6.5 earthquake vancouver island bc october 22 2018, M6.5 earthquake vancouver island bc map
M6.6 earthquake vancouver island bc. via USGS

This first shallow shaking was followed, 30 minutes later, by a stronger M6.8 tremor almost at the same spot, 197km SW of Port Hardy, Canada. Shakings were reported by at least 75 people on the USGS homepage.

M6.5 earthquake vancouver island bc, M6.5 earthquake vancouver island bc october 22 2018, M6.5 earthquake vancouver island bc map
M6.8 earthquake vancouver island bc. via USGS

Finally, the third strong tremor, a M6.5, hit at 6:22am UTC (11.36pm PDT), 223km SW of Port Hardy, Canada.

M6.5 earthquake vancouver island bc, M6.5 earthquake vancouver island bc october 22 2018, M6.5 earthquake vancouver island bc map
M6.5 earthquake vancouver island bc. via USGS

The 3 quakes are likely due to horizontal strike-slip faulting on the Sovanco transform fault that offsets the Juan de Fuca Ridge.

The quake was not in the Cascadia subduction zone and did not trigger any tsunami warnings.

These three strong quakes are just a warning of the next big one along the Cascadia Subduction Zone. Get prepared and be ready!

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