SP12RTS nesting tomography globes - "Seismic Matryoshka"

thingiverse

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. To capture the 3D nature of tomography models (in which velocity structure varies with depth), we draw analogy to Russian nesting dolls (Matryoshkas). Globes can be separated to reveal deeper layers. The tomographic velocity model presented here is SP12RTS (GJI, Koelemeijer et al 2016) and shows structures up to spherical harmonic degree 12. We have selected layers at 50 km depth (shallow), 660 km (mantle transition zone) 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.