Two of the largest moment magnitudes measured to date are the 2004 Sumatra event (M_S of 8.8;M_W of 9.1)and the 1960 Chile earthquake (M_S of 8.5;M_W of 9.5).

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The statement is true. The 2004 Sumatra event had moment magnitudes of 8.8 and 9.1, while the 1960 Chile earthquake had moment magnitudes of 8.5 and 9.5, which are among the largest ever recorded.

Two of the Largest Moment Magnitudes Measured to Date Are