what are some primary and secondary effects of a tsunami?

Answer 1

By primary, I suppose you mean the death of humans and animals and destruction of buildings in the path of the waves.
"Most of the damage is caused by the huge mass of water behind the initial wave front, as the height of the sea keeps rising fast and floods powerfully into the coastal area. The sheer weight of water is enough to pulverise objects in its path, often reducing buildings to their foundations and scouring exposed ground to the bedrock. Large objects such as ships and boulders can be carried several miles inland before the tsunami subsides."http://en.wikipedia.org/wiki/Tsunami

By secondary, perhaps the longer term effects on local economies and health facilities: loss of jobs, loss of hospitals and schools, destruction of sewage treatment facilities, creation of orphans.