You may have already determined your friend's condition given you asked this question 3 months ago. However, the Red Cross has a service that locates people who have been in a natural disaster and reports their condition to the person requesting the service.
It can take a month or more to receive an answer; but, they usually can find the "lost" person.
Hi pippap, I never thought about Red Cross as alternative to get the answer some of my friends' condition there and I think I'll try that. I hope I can contact Nepalese Red Cross for this purpose. Thank you very much for your advice.