I had mailed Jiroh Nishi, Masanori Sato and Minoru Imajima. As we've already heard from Andy, Jiroh and his family are safe. Masanori and his family are safe as well living in Kagoshima in the South of Japan.
I haven't had any reply yet from Minoru Imajima although he seems to check his email regularly.
Let's hope for the best and that the nuclear desaster does not become true!