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.

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.

FRESNO COUNTY, CA - According to the U.S. Geological Survey, a 2.0 magnitude quake occurred close to Avenal Monday afternoon.

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

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.

Fifty years ago, Alaska experienced the biggest man-made earthquake in our history. The ground shook as heavy machinery forged a new road to the Arctic Ocean, hundreds of thousands of