Concerning blood donation: If you want to donate, you may want to wait a week or two. In disasters such as this, this is one of the first things most people think of doing and, as a consequence, a huge amount of blood gets donated in the first few days to a week. Then, those people can't donate again for some time. As a result, there is a huge supply of blood which expires at a single point in time and a limited supply of eligible donors a few weeks later. In several previous disasters (I'm think especially about the 1989 quake here in the Bay Area), much of the initially donated blood expired unused and had to be thrown out. Then there was a shortage.

As an MD, I pay attention to these matters.