"a magnitude 9 quake such as Sunday’s [Tsunami] would be equivalent to more than 190 million tons of TNT"
"one ton of TNT is equal to 4.184 x 109 joule (J)"
So the tsunami was about 8 x 10e17 joule.
Lifting one kilo one meter is about 10 joule.
6 billion people times 75 kilo is about 4.5 x 10e11 kg
So 4.5 x 10e11 kg falling down one meter would release 4.5 x 10e12 joule.
This would be 200'000 times less than the energy of the tsunami, which had almost no influence on the axis of earth.
(Unless there is an error in the calculation....
)