A magnitude 8.1 earthquake near the Kermadec Trench was the third and largest earthquake of the three. This event is near the magnitude 7.4 earthquake that occurred earlier this afternoon, some 600 miles (950 km) north of New Zealand. While large, these earthquakes are remote and the USGS PAGER report is Green for fatalities and economic losses. The M8.1 earthquake is about 11 times larger than the earlier M 7.4 and occurred at a shallower depth (early estimates about 12 miles, or 20 km). The larger size and shallower depth increase the tsunami potential, and NOAA have released tsunami warnings for many islands in the southwest Pacific. The National Emergency Management Agency of New Zealand have also released a tsunami warning.

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On Friday, the Cascadia Subduction Zone, a fault running from Northern Vancouver Island to Northern California, will be brought to the attention of the northwest as a potential source of the largest natural calamity in North American history.

A megathrust earthquake with a magnitude of 9 occurred 318 years ago. The Washington State Department of Resources blogged about the occasion on Friday.

The megaquake and tsunami that hit Japan two years ago are still having a hard time healing. The Pacific Northwest, which faces a similar catastrophe, is considering actions to take over the ensuing decades to prevent a massive earthquake from sending the area into a lasting economic slump.

Japan, the country with the best seismic defenses in the world, was shaken by a huge earthquake and tsunami that is similar to those that may someday hit the Pacific Northwest. The country will need another five to ten years to recover. There are still around 320,000 individuals living in temporary accommodation. Mountains of trash still need to be removed.

(VANCOUVER, British Columbia) — Off Canada's west coast, there was an earthquake of magnitude 7.7, although no significant damage was reported. British Columbia residents were evacuated from some areas, but the province seemed to mostly avoid damage from the largest earthquake to hit Canada since 1949.

According to the U.S. Geological Survey, the strong earthquake struck the Queen Charlotte Islands shortly after 8 o'clock. It was located 96 miles (155 kilometers) south of Masset, British Columbia, and was at a depth of around 3 miles (5 kilometers) as of local time on Saturday. Both on the mainland of British Columbia and on its Pacific islands, it was felt over a sizable portion of the country. Shirley Bond, British Columbia's minister, stated that "it appears that the damage and risk are at a very modest level."

Scientists are still investigating the massive earthquake and tsunami that struck Japan last year, and part of what they are learning is concerning for the Pacific Northwest.

Researchers presented their findings at the annual meeting of the American Association for the Advancement of Science on Sunday. They found that detailed analyses of how the Earth warped along the Japanese coast indicate that shaking from a Cascadia megaquake may be stronger than anticipated along the coasts of Washington, Oregon, and British Columbia.