[Straight Vermonter]

I never did hear if it had an effect on plate tectonics.

Earthquakes by definition have an impact on plate techtonics.

[crazyshrink]

Obviously. I could have better stated my question by questioning what effects were measured on a global scale resulting from earthquakes, tsunamis, metoer strikes, etc.

[Bernard Marx]

I never did hear if it had an effect on plate tectonics.

Earthquakes by definition have an impact on plate techtonics.

Tsunamis are the *result* of earthquakes. Earthquakes are the *result* of plate tectonics. Plates can abruptly (in the sense of geologic time) shift directions. I've never heard of a theory to account for that.