Tsunami: Estimating population affected

There's quite a bit of confusion over "how many" were affected.

Let's take a Google approach. There should be already-existing maps showing the population densities along the coasts.

Here's what to do. Find a map.

Then go inland 10 miles. Assume everyone within 10 miles of the ocean is gone.

A high number, but probably far more accurate than the current piecemeal approach.