What provinces comprise the area where the 1944 San Juan earthquake took place?
1944 San Juan earthquake: The 1944 San Juan earthquake took place in the province of San Juan, in the center-west area of Argentina, a region highly prone to seismic events. Cuyo (Argentina):  Historically it comprised the provinces of San Juan, San Luis and Mendoza and was influenced by Chile.
San Juan, San Luis and Mendoza