In San Francisco, the fans and players ignore a light earthquake at 3Com Park – 4.8 on the Richter scale – in the 3rd inning, and the Giants break a 6th-inning tie to win, 8 – 5, over the Expos. Matt Williams hits his 11th home run and drives in three runs for San Francisco, while Henry Rodriguez hits his 17th homer for the Expos. His three ribbies give him 51 to lead the National League.

On May 21, 1996 — In San Francisco, the fans and players ignore a light earthquake at 3Com Park – 4.8 on the Richter scale – in the 3rd inning, and the Giants break a 6th-inning tie to win, 8 – 5, over the Expos. Matt Williams hits his 11th home run and drives in three runs for San Francisco, while Henry Rodriguez hits his 17th homer for the Expos. His three ribbies give him 51 to lead the National League.

Source:
Baseball Reference May 21