Alaska: 2018 Seismicity; Color coded by depth, Notable events labeled
The Alaska Earthquake Center at the University of Alaska – Fairbanks, has done their annual year in review for 2018. We set a record for earthquakes within the state, with over 55,000 events during 2018. That blows past the previous record of 42,989 set in 2017. The next highest number occurred in 2014 with 40,686 quakes. We had so many earthquakes in 2018 that AEC is still counting to get a specific number.
It needs to be noted, that much of the increase in numbers is due to advancing detection techniques, as well as additional recording stations. The purpose of this post, is not to imply that Alaska is about to break off from the Yukon, but to show how seismically active Alaska is.
The two largest earthquakes have set off thousands of aftershocks. The 7.9 magnitude quake in the Gulf of Alaska was the largest, followed by the now rated 7.1 near Anchorage in November.
We also had a couple of “swarms” in the northern part of the state, in the Brooks Range & on the North Slope, that lasted for months, and accounted for over 17,000 events.
The surprise earthquake of the year, happened near Kaktovik, on Alaska’s north coast. The 6.4 mainshock and 6.0 aftershock, were by far the largest ever recorded north of the Brooks Range.
On Saturday, March 9, a sudden jolt went through the cabin as I worked about the place, while listening to Minnesota hockey swarm the Michigan Wolverines. Sure enough, a 3.7 magnitude quake had occurred roughly 15-20 miles from the cabin.
A very special thanks to the Alaska Earthquake Center for the above graph and earthquake information.
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