There was a 7.7 magnitude earthquake that struck offshore near Haida Gwaii on October 27th/2012..5 months ago, the big crackerjack earthquake was followed by many aftershock quakes, ranging from 4.8 to 5.8 in magnitude...
Earthquakes are measured with a device called the Richter scale, many aren`t aware of how this scale works, a 4.0 quake is 10 times the severity of a 3.0 quakes..An earthquake that measures 5.0 on the Richter scale has a shaking amplitude 10 times larger than one that measures 4.0, and corresponds to a 31.6 times larger release of energy..
Keeping that in mind 2 days ago there was 4 rather large quakes near the area of Haida Gwaii that recently had a 7.7 quake..Offshore quakes, meaning a big one will trigger a devastating tsunami..
"The first of the quakes, with a magnitude of 4.5, struck about 90 kilometres south of Sandspit just after 5 p.m., according to the U.S. Geological Survey.
Two more followed at 5:45 p.m. and 5:55 p.m., measuring 4.3 and 4.4, respectively, both around 75 km south of Sandspit.
Another 4.5-magnitude quake followed in the same area as the first around 7:30 p.m."