The largest recorded earthquake in United States history was the 1964 Great Alaska earthquake, which struck on March 27, 1964, and registered magnitude 9.2 on the moment magnitude scale, according to the USGS.

Closely monitored Barry Arm is a test case in a region where melting glaciers, steep slopes and narrow fjords set up conditions for dangerous tsunami-generating slides.

Alaska has been shaken up by seven earthquakes on Sept. 16, according to the United States Geological Survey. We look at where they hit and how big they were.

According to the Alaska Earthquake Center, the Aleutian megathrust is the primary cause of the strongest earthquakes in the region. It's a major subduction zone fault, an area where two tectonic plates meet. Along this fault, the Pacific Plate is being forced beneath the North American Plate, resulting in substantial seismic activity.

Scientist have been researching how much of a warning Alaskans could get with an earthquake early warning system.