Earthquakes rumble in Alaska and north of B.C. in Northwest Territories

    1 of 4 2 of 4

      While several earthquakes over 4.0-magnitude have been taking place in Alaska, a quake also hit near the Yukon border of the Northwest Territories.

      Among the quakes took place on August 8 and 9 in Southern Alaska near McCarthy, Alaska, the two most notable were a 3.9- and 4.5-magnitude quake.

      U.S. Geological Survey

      Then on August 12, an offshore quake hit in the Gulf of Alaska west of the Alaska Panhandle and British Columbia at 6:49 p.m. local time (7:49 p.m. Vancouver time).

      A shallow quake, with a depth of only three kilometres (two miles), the epicentre was located 145 kilometres (90 miles) southwest of Yakutat, Alaska,; 412 kilometres (255 miles) west of Juneau, Alaska; 431 kilometres (267 miles) southwest of Whitehorse, Yukon; and 555 kilometres (344 miles) southeast of Anchorage, Alaska.

      The U.S. Geological Survey initially reported as 4.3.-magnitude quake but was later revised to 4.1-magnitude.

      U.S. Geological Survey

      The largest of these quakes was an offshore one that struck south of the Aleutian Islands at 10 p.m. local time (11 p.m. Vancouver time)  on August 12.

      The epicentre, at a depth of 12 kilometres (seven miles), was positioned 147 kilometres (91 miles) south of False Pass, Alaska; 158 kilometres (98 miles) southeast of Akutan, Alaska; and 1189 kilometres (737 miles) southwest of Anchorage.

      Originally measured as a 5.6-magnitude quake, the U.S. Geological Survey later reassessed it as a 5.7-magnitude quake.

      No tsunami warnings were issued for any of these quakes.

      Earthquakes Canada

      Meanwhile in Canada, an earthquake hit the Northwest Territories near the Mackenzie Mountains, which run along the Yukon border, and north of Fort Nelson, B.C.

      It struck at 7:34 p.m. on August 12 at a depth of 10 kilometres (six miles).

      Earthquakes Canada measured it as a 4.5-magnitude seismic event while the U.S. Geological Survey reported it as 4.0-magnitude.

      The epicentre was located 140 kilometres (87 miles) southwest of Wrigley, Northwest Territories; and 540 kilometres (336 miles) west of Yellowknife, Northwest Territories.

      Earlier this week, the U.S. Geological Survey stated in a forecast report that a swarm of seismic activity near the San Andreas Fault in California could trigger a quake of 5.5-magnitude or larger in the region this week.

      You can follow Craig Takeuchi on Twitter at @cinecraig or on Facebook.