In the sense that public health is deifinitely within the realm of E-Med, yes we are in a sense prepared for this type of relief work but I doubt that many US EPs would know exactly what to do if dropped in the middle of Indonesia. Some EPs and physicians from other specialties take a special interest in relief medicine. You need to know what's in a WHO medical kit, how to do procedures when resources are limited, how to manage public health in a refugee camp etc. For those who are interested I just got done reading "Emergent Field Medicine" which basically covers all the bases of relief-type medicine including setting up a safe water supply, handling mass casualty in a third world setting, managing waste, etc. It's a great read especially if you're interested in this stuff.
Casey