Google has created the site, "Google Person Finder".
It currently has the record of 7200 people and you can type in the name of person you are looking for and find out if he/she is safe.
You can watch the Japanese News ontime from the site below.
If the person you are looking for has a cell phone in Japan, and you know which company his/fer cellphone is, you can check each company's website below and type in the phone number to see if he/she has left the message. The available areas are Aomori, Miyagi, Yamagata and Fukushima. prefectures.
For the docomo users:
For the KDDI (Ezweb) users:
For the Softbank users:
For the Wilcom users:
For the Emobile users:
Another way to find out: