When I was there for my job I felt some eartquakes, my colleagues were perfectly calm while I was extremely nervous. I am worried, but not so much about the collapse of the building in the nuclear plant. I am Phd in safety of nuclear plants and looking at the videos it looks that it was not the reactor building, but an an auxiliary building.
It is clear that the steel structure is still on place and only roof and wall panels were blown by the explosion. The reactor building is not done like that. It is in concrete with steel liner and is much smaller.
I am worried a lot of the tsunami wave: if it destroyed the emergency generators trouble will come, but apparently they were able to turn on the system for flooding of the reactor core. I really hope that there is water in that reactor now.