What is a plausible way to fuel highly active volcanism and seismic activity on my planet?

I thought that a large, close moon might help generate enough heat and stress to raise the average temperature on my world and stave off a Snowball Earth scenario. According to this article and this article, I was incorrect. (Thanks very much for the help on that problem, though--I couldn't have done it without you!)

This leaves me with a missing link. How should I generate the seismic and volcanic activity necessary to keep my planet warm, despite its distance of 2 AU or so from my star of 1.7 L_Sol? If it comes to a total remodel I will gladly do so, because I would prefer to keep my world an ocean world rather than a dirty snowball.

Thanks for all the help these last couple days--I'm new to Stack Exchange and this has been a very welcoming community so far. You're the best. <3 R

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What is a plausible way to fuel highly active volcanism and seismic activity on my planet?

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