According to wikipedia, the strongest earthquake recorded, was in Valdivia Chile, on May 22, 1960. It was a 9. 5 magnitude.
On March 27.1964, in Prince William Sound, Alaska, there was a 9.2 On Dec.26, 2004, in Sumatra, Indonesia, they had a 9.1 On March 11, 2011, Sendai, Japan, it was recorded as 9.0 As there are no actual readings before 1900, it really can't be proved if the Valdivia Chile earthquake was the strongest, but this was the recorded magnitude in 1960.
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