The earthquakes in Alaska

Earthquake swarm in Alaska

A magnitude 6.4 earthquake hit an area 84km SW of Kaktovik, Alaska, on August 12, 2018.

Numerous other earthquakes did hit the area as well on August 12, 2018.

From the set at: 

 

https://www.facebook.com/SamCarana/posts/10160630245860161

To give an idea:

Over the area hit by a M 4.7 earthquake on July qw, 2016, high methane levels showed up at an altitude o f4,116m or 13, 504 ft on July 15, 2016.