Behavior of my patchwork planet?

So I have a planet with tectonic plates that are separated by massive canyons that reach all the way down to the mantle. Obviously this means that the planet is very unstable and violent, experiencing earthquakes and volcanic eruptions regularly. Also, it rotates so fast that it has a ten (10) hour day/night cycle, and orbits its star at high speed. Its other characteristics aren't really important for the question, but suffice it to say that this planet is not exactly a tourist destination.

So how can this planet hold itself together? Will it need to be abnormally large or made of some exotic materials?

I would like to have it relatively close to Earth's gravity, but heavier is OK as long as it is survivable and possible to leave the planet. The planet also doesn't have to have any sort of atmosphere or surface water, so no worries there.

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Behavior of my patchwork planet?

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