March 27, 2014 marks the 50th anniversary of the great Alaska earthquake. On March 27, 1964 at 5:36 pm local time a magnitude 9.2 earthquake began, ultimately breaking a fault about 400 miles long and a few 100 miles wide, rupturing from beyond the western edge of Kodiak Island to the eastern side of Prince William Sound and from well offshore inland to Upper Cook Inlet. The earthquake lasted approximately 4.5 minutes and is the largest earthquake in U.S. history and the second largest globally, next to the great 1960 M9.5 Chile earthquake. The earthquake was felt in Dutch Harbor, 800 miles west of Anchorage, and in Seattle 1200 miles to the southeast of Anchorage. Water well levels rose and fell in 47 states of the U.S. Here are some links to important information regarding the 1964 Alaska Earthquake.