Physics
The cause for the Tsunami, as deduced by the seismologists, is

Low pressure trough in the ocean
Gravitational pull of the moon
Sudden change in the monsoon wind
Deformation of sea floor and vertical displacement of water

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Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Below a certain minimum value irrespective of amount of water in the pail
Below a certain minimum value depending on amount of water in the pail
Above a certain minimum value irrespective of amount of water in the pail
Above a certain minimum value depending on amount of water in the pail

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