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Unless it lands in the ocean in which case tidal waves, and if on land, probably an earthquake/shockwave.

A comparable ocean impact would be the 2004 Indian Ocean earthquake, which was about 3x more energetic.

I'd assume quakes transform much more energy into tsunami waves than meteorite hit does.

That is not correct.

Earthquakes' energy doesn't all go to displacing water and hence generating tsunamis. An ocean impact is significantly more efficient at transferring energy into tsunamis.

https://www.sciencedirect.com/science/article/abs/pii/B97804...

Interesting, I would assume surface wave dissipation to counteract that compared to seabed origin.

2004 Indian Earthquake was 9.1-magnitude, so it was about 150 megatons of TNT.

The USGS estimated 1.1×10^17 Newton-Meters of energy, which converts over to ~26Mt TNT.

https://web.archive.org/web/20100404013939/http://neic.usgs....

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