I've been checking various circle websites since the big earthquake and the tsunami hit Japan to make sure everybody is safe.
I can merely give you a few basic information because if I would go into detail, the list would be much longer. It's just meant as a quick overview for the people who are concerned about their favourite doujinka's health.
The locations - if known - are based on the last residents I knew. There's always the chance that doujinka moved and didn't make their new residents known.
The list is sorted by the circle's name. So this is the result so far.