Tripling the mass of Earth to create 3xPlanet would have profound geological implications. A more massive planet would have a stronger gravitational pull, which would significantly affect its surface and interior dynamics. The increased gravity would lead to a more compressed crust, making tectonic plates move more slowly and less frequently. This could result in fewer but more powerful earthquakes and volcanic eruptions. The greater mass would also lead to a larger core, which could imply a stronger magnetic field. This magnetic field would offer enhanced protection against solar and cosmic radiation, potentially creating a more stable environment for life to develop.