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It's simple physics really. Take what you know about waves, water displacement, gravity, the earth's axis, and tectonic plates ... then apply it! I was taught all this stuff in grade school.
In simple terms, the earth's crust (the part that we life on) shifted to where the gravitational pull from the earth's core tightened up a slight bit. Now the earth rotates faster by like .000003 of a second (rough estimate) per rotation.
To demonstrate this in real life, take an object and tie a string to it. Hold the end of the string and swing the object around with a moderate amount of effort. Now, grip the string a little bit closer to the object (essentially shortening the string) and whirl the object around with the same amount of effort. The object will swing faster. In this model, your hand is the core of the earth and the object is any given point on the earth's crust.
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