My equivalent memories seem to be about the sounds as much as the images.
9/11 - I was on Mat Leave with DC1. Can recall as clear as anything exactly how I was sitting & feeding as the 2nd plane hit. Then how I was patting & winding as the first collapse began.
Lockerbie - The news reports that night & appeals for sightseers to stay away. The cockpit lying in the field.
Boxing Day tsunami - feeding DC2 this time, upstairs at the IL's, hearing the TV news.
Piper Alpha - I was in Aberdeen. The sound of the helicopters overhead while the flames were on TV. I knew several of the helicopter pilots.