The “Crust Reasonance” theory? There was a 4.2 ESE of Acupulco (I forget the name of the city) last night, hours after the Chile 8.2’s 6.1 aftershock.
That would fit into the perpendicular theory.
Unless there is a real “stem winder”, it will be very hard to tell. However, a puzzling characteristic of the theory is a delay, far longer than the frequency of an earthquake, lasting around three or four days, seems to fit into the equation.