How big was the largest earthquake in Alaska?
The largest earthquake recorded in Alaska was a M9.2 that occurred on March 27, 1964 in the Prince William Sound. This was the 2nd largest earthquake ever recorded in world history. The energy released in this earthquake was equivalent to approximately 4 trillion pounds of explosive. The motions on the fault lasted for 4 minutes, rupturing an area about 800 kilometers long and 250 kilometers wide. The average movement on the fault was about 9 meters.
