In recognition of the 50th anniversary of the second largest earthquake
ever recorded by seismometers (and the largest on the North American
Continent), we offer a new animation that describes the causes of the
magnitude 9.2 Great Alaska Earthquake that occurred on March 27th, 1964.
The earthquake rocked the state with strong ground shaking for 4.5
minutes. This animation shows the underlying causes of that earthquake,
and tells how research done on the ground deformation contributed to
confirmation of early theories of plate tectonics.