Geophysics globe: S40RTS tomography "seismic matryoshka"

Global tomographic models of seismic velocity provide us with crucial information about the planet’s interior. Here, we represent S wave velocity variation such that slow velocities stand proud and fast velocities as depressions.

For a longer wavelength, 3 layer model, see https://www.thingiverse.com/thing:3254056.

To capture the 3D nature of tomography models (in which velocity structure varies with depth), we draw analogy to Russian nesting dolls (Matryoshkas). The outer globe can be separated to reveal a deeper layer.

The tomographic velocity model presented here is S40RTS (GJI, Ritsema et. al. 2011) and shows structures up to spherical harmonic degree 40. We have selected layers at 100 km depth (shallow) and 2850 km (core mantle boundary).

The models can be printed without support, though this gives a slightly messy interior at the top which may need cleaning before assembly so that everything fits snugly. The holes are sized for 5 mm diameter, 2 mm thick cylindrical neodymium magnets which can be glued in place for a snap-together fit. Alternatively, use the 5mm plug stl provided for a grip-fit.