How do the orbital periods of Io, Europa, and Ganymede sustain Io's tidal heating?

Answer

They maintain a resonant relationship that keeps Io's orbit eccentric

The specific ratio of their orbital periods (Io completes two orbits for every one Europa makes, and four for every one Ganymede makes) creates a resonance that repeatedly counteracts circularization, ensuring continuous tidal stress.

How do the orbital periods of Io, Europa, and Ganymede sustain Io's tidal heating?
GeologyJupitermoonsVolcanismTidal heatingIogeological activity