On the wikipedia Article (not linked) and the the video i linked about it, you can see that this is not even close to be able to wipe us out in one hit.
However, if it does hit it's Perfect-Zero Ground, it will plunge 3 miles in the ocean, explode, and generate a rapid succesion of 5 stores high Tsunami waves that would Sandblast clean the entirety of the West coast of the US (sorry if i mispoke here, it's wherever Malibu is) by a quarter of a mile.
My personal idea also goes to the possibility of some pretty nasty Earthquake Swarms.
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