Dear Raykeed,
Well, Katrina got me thinking about this but it would be up to the Reiki circle to decide what is best for them but maybe any disasters where large groups of humans are in emergency situations. Since that is pretty much a frequent happening, the group would have to decide what their focus would be. People have families & work schedules to consider, of course. But Katrina is a perfect example of a large scale event for which healing energy sent to the earth, the animals & any person who wishes it could be beneficial. Prayer groups might also be an idea. Im not in a circle at the present but thinking of getting back into one.
peace & joy,
holobon