Inversion of vertical deflection data by the program GREMMO

Geology is the limiting factor for a precise geoid but also for geophysical

inversion. To increase geoid accuracy to ±1-3 cm a special GIS for gravity field

inversion by interactive crustal modelling was developed. It combines data from

geodesy, geophysics, geology and petrography. As a basis for density models and a

new Austrian geoid, it promotes future geotechnical cooperation. The main modules

are data input, subsurface models, geological gravity computing, visualisation. This

paper presents examples from the Vienna Basin and the Flysch Alps.