Chile
The most powerful earthquake recorded in modern times was the 9.5 magnitude quake (moment magnitude) that struck Valdivia, Chile on May 22, 1960.
Chile on May 18, 1960.
Actually, the largest recorded earthquake goes to Chile in 1960 with a 9.5 magnitude earthquake.
The largest earthquake recorded by man was the magnitude 9.5 Valdivia earthquake in Chile which occurred on the 22nd of May, 1960.