Two shallow earthquakes (M4.0, M4.3) hit northern Vancouver Island within 10 minutes right along the Cascadia subduction zone

Two shallow earthquakes have struck off the northern coast of Vancouver Island within 10 minutes on January 14, 2017. The first tremor (M4.0) occurred at 10:54 a.m.. About 10 minutes later, a 4.3-magnitude earthquake struck in the same area. The epicentre for both quakes was 159 kilometres west of Port Hardy, at a depth of 10 kilometres. Seismologists do not expect it to have been felt on the Island.

2 earthquakes (M4.0 and M4.3) hit off Vancouver Island along the Cascadia Fault Zone on January 14 2018, 2 earthquakes (M4.0 and M4.3) hit off Vancouver Island along the Cascadia Fault Zone on January 14 2018 map
2 earthquakes (M4.0 and M4.3) hit off Vancouver Island along the Cascadia Fault Zone on January 14, 2018. via USGS

The Cascadia Subduction Zone is a very active region. It’s a part of the plate margin, the region between the Pacific plate and North American plate where we see hundreds of earthquakes each year. The earthquake waves tend to lose quite a bit of energy as they travel from the oceanic plates onto the continental plate, onto Vancouver Island.

Juan de Fuca Triple Junctions and the Cascade Volcanic Arc, 2 earthquakes (M4.0 and M4.3) hit off Vancouver Island along the Cascadia Fault Zone on January 14 2018, 2 earthquakes (M4.0 and M4.3) hit off Vancouver Island along the Cascadia Fault Zone on January 14 2018 map
Juan de Fuca Triple Junctions and the Cascade Volcanic Arc. via Wikipedia

A 6.8-magnitude earthquake was recorded back in 1991 along the same offshore-fault.

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