The dam failure was not due to an earthquake. It was reportedly due to faulty automated equipment that controls the water level in the lake. The equipment overfilled the reservoir causing the dam to give way. Fortunately, relatively few people were hurt, and it could have been much worse.
Unfortuantely, the 3 that were seriously injured were young children. Hopefully, they will recover completely, and this won't ruin their Christmas.
Greg