Coulomb stress imparted by the M=9.5 Chile earthquake, calculated by Lin and Stein (2004) based on the seismic slip model of Barrientos and Ward (1990). The large black stars are the main 1960 sub-events. Today’s quake struck on a part of the fault that was likely promoted by the 1960 shock. But if so, why did it wait for 56 years?

Coulomb stress imparted by the M=9.5 Chile earthquake, calculated by Lin and Stein (2004) based on the seismic slip model of Barrientos and Ward (1990). The large black stars are the main 1960 sub-events. Today’s quake struck on a part of the fault that was likely promoted by the 1960 shock. But if so, why did it wait for 56 years?

Coulomb stress imparted by the M=9.5 Chile earthquake, calculated by Lin and Stein (2004) based on the seismic slip model of Barrientos and Ward (1990). The large black stars are the main 1960 sub-events. Today’s quake struck on a part of the fault that was likely promoted by the 1960 shock. But if so, why did it wait for 56 years?