If we're talking about geological scales (millions of years) then yes, this would require an increase in internal energy. But I was thinking more of this century.
We alread know that human activity causes weak earthquakes, but it appears there is a possibility that stronger earthquakes are increasing too or will increase due to human activity, with climate change - ie. with melting ice on the poles, significant redistribution of mass is happening, affecting levels of stress on the crust and may even induce volcanism.
We have moved a lot of energy from the crust to the atmosphere and Earth's energy budget is not in balance any more - more energy is received (from the Sun) than it is radiated away.
Positive feedback effects will further increase energy in atmosphere, but will certainly affect the crust too.
Temperature and pressure are correlated, and stronger buildups/releases of pressure within the crust and increase in frequency of earthquakes cannot be ruled out.