Fig. 3.
From: Variability of megathrust earthquakes in the world revealed by the 2011 Tohoku-oki Earthquake
Seismic activity prior to, and after, the 1964 Alaska earthquake (reproduced from Yomogida et al., 2011). Historical earthquakes from 1936 to before the 1964 Alaska earthquake of magnitudes equal to, or larger than, 5.0, and focal depths equal to, or shallower than, 60 km are plotted on the top. Aftershocks on the bottom are from the Alaska Earthquake Information Center6, and the asperity from Ruff and Kanamori (1983) is indicated by the shaded area. 6http://www.aeic.alaska.edu/quakes/Alaska_1964_earthquake.html.