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Explosion isn't the real difficulty imho. Even if there was an explosion sufficient to loft a moon's worth of material into space, how did it obtain sufficient orbital velocity to stay in space?

An explosion big enough to crack the planet into two chunks is one thing, the series of carefully timed explosions necessary to start those chunks spinning nicely around each other is totally different.

If earth was already spinning, then an explosion that splits earth's core into two chunks would end up with those chunks orbiting round eachother.

The resulting spin of each chunk can depend on the location of the explosion in the pre-explosion earth.

If you have the fission happening surrounded by rock, it can indeed get to very high temperatures and pressure, and after the rock gives and the hot material comes in contact with water, pressure will rise very rapidly.

Well, tell me comrade, how could it explode?

That's impossible! You are wrong!

What leads you to believe that high pressure could not be reached?