Reply #63: Yes, a massive vertical thrust, about 1000 km long and 10 m high

[Nothing Without Hope]

This info is from the BBC/S Asia site.

At 0759 (0059 GMT) a violent rupture occurred on the sea floor along a fault about 1,000km long.

All along the rupture the seafloor was shunted vertically by about 10 metres.

This movement displaced hundreds of cubic kilometres of the overlaying water, generating a massive tsunami, or tidal wave.

The wave then fanned out across the Indian Ocean at enormous speed. (In the graphic it says the speed is up to 500 km/h, but slows to 45 km/h as it reaches near shore and is squeezed upwards by the seabottom

The scale of all this is beyond awesome.