Global reference model

The global reference model will be dereived by the combination of satellite gravity and magnetic data, crustal structure, petrological constraints and seismic tomography.

A global reference temperature and density model has been derived based on converting seismic velocities to density by using an initial mantle composition regionalization based on the global shear-wave (Vs) SL2013sv model and global average compositions of xenoliths/peridotite massifs from different tectonothermal ages. Three major compositional domains are distinguished: Phanerozoic, Proterozoic and Archean. Radially, mantle composition varies from a lithospheric type (any of the three mentioned before) to a typical sub-lithospheric, pristine upper mantle composition. An average lithospheric thickness is assumed for each of the compositional domains. The reference model includes six global layers at depths of 56 km, 80km, 110 km, 150 km, 200 km, 260 km and 330 km. The global model can be used as an initial reference/background model for subsequent studies and steps in this project. The data will be inverted by an non-linear gradient search algorithm (Levenberg-Marquardt).

Example of inversion results for global temperature inversion.

Example of inversion results for global temperature inversion.

Example of inversion results for global temperature inversion.

Example of inversion results for global density inversion.