Fig. 2.
From: Variability of megathrust earthquakes in the world revealed by the 2011 Tohoku-oki Earthquake
Seismic activity along the Chilean subduction zone. We notice sparse seismicity prior to the 1960 and 2010 great earthquakes (seismic gap) and a narrow seismically active area along the subduction zone. These are typical characteristics of ASSS. Epicenters relocated by Engdahl et al. (1998) are used from 1900 to 1972. From 1973 to July 2011, the USGS NEIC database5 has been analyzed. 5http://earthquake.usgs.gov/earthquakes/eqarchives/epic/epic_global.php.