Did you ever wonder how many earthquakes could hit before the earth is thrown off it's orbit?
I had to look it up...
Can the Earth Leave its Orbit?
Conservation of Momentum
The idea of the Earth's orbit or rotation being disturbed is a common catastrophe theme, exploited in movies such as The Day the Earth Caught Fire, not to mention the theories of Velikovsky. In The Day the Earth Caught Fire, nuclear explosions send Earth spiraling toward the Sun, and only a last-ditch counter-explosion saves the world. The movie features one of the best scripts of any science-fiction film, but the story line is impossible. Unless mass were expelled from the Earth, or some force were applied from outside the Earth, it would be impossible to change the Earth's orbit or rotation. To see this, sit in a swivel chair equipped with casters. Now, without touching the floor or anything outside the chair, try to get the chair rotating. Try to move it across the floor. Its just about impossible (that you can do it at all is due to a small amount of friction between the chair and the floor.) The principle here is called conservation of momentum. While in the chair, you are an isolated system. You had zero rotational momentum to begin with, and zero linear momentum, and regardless of what you do, zero they stay. What little motion you impart to the chair results from there being some friction in the casters and swivel, so that you do interact very slightly with the floor. An astronaut floating free in space without a safety line or propulsion would be utterly helpless to reach safety even a few feet away. He would have no way to acquire momentum. Nothing acting solely from on or within the Earth could change its orbit or seriously alter its rotation.
I'm still not satisfied...
Snoozy