Radar altimetry measurements of Olympus Mons.
That's a big dome volcano. Any changes in its elevation should give an idea of how much subterranean activity there is. Outgassing might do that too. I'm guessing there is no data.
Space/Science » in reply to "heat flow values"
That's a big dome volcano. Any changes in its elevation should give an idea of how much subterranean activity there is. Outgassing might do that too. I'm guessing there is no data.