Global Moho Gravity Inversion from GOCE Data: Updates and Convergence Assessment of the GEMMA Model Algorithm

Since its discovery in 1909, the Moho was routinely studied by seismological methods. However, from 1950s, a possible alternative introduced gravimetric inversion. Thanks to satellite gravity missions launched beginning of 21st century, global inversion became feasible, e.g., leading computation GEMMA model 2012. This computed inverting GOCE second radial derivatives anomalous potential Wiener filter, which applied spherical harmonic domain, considering two-layer with lateral and vertical density variations. Moreover, seismic information deal joint estimation/correction both geometry crustal model. study aims at revising algorithm theoretical point view, introducing cleaner formalization studying used approximations more thoroughly. The updates are on: (1) management due forward operator linearization required for inversion; (2) regularization coefficients proper modelling signal error covariances; (3) inclusion additional parameters their Least Squares adjustment correct exploiting information. these updates, significant improvement computational view is achieved too, thus convergence iterative solution differences respect previous can be assessed closed-loop tests, showing performance retrieving simulated “true” Moho.