Not an astronomer - but isn't it Really Old News that all of Mercury, Luna, and Mars are "obviously" tectonically active - because, even absent every other possible cause, they're all giant rocks, all slowly cooling, and rock shrinks as it cools?

And Mars, with giant volcanoes and credible evidence of recent* vulcanism, obviously has more options for causing quakes.

*"Recent" in the geologic sense - https://en.wikipedia.org/wiki/Volcanism_on_Mars#Potential_cu...