The Mineral, Virginia earthquake a few years ago was 5.8. It was near the North Anna nuclear plant which was built to withstand 6.0. Not much margin of error there. Millions have also been spent for repairs in Washington, DC on the National Cathedral and the Washington Monument. I think in DC it was at least 4. Tried to find number but did not succeed.
Especially considering it was built on a fault. The presence of the fault was 'omitted' from permitting data.