Titel: The compilation of the new Alpine gravity maps - from the work of the AlpArray Gravity Research Group

Pavol Zahorec1, Juraj Papco2, Roman Pasteka3, Miroslav Bielik3, Sylvain Bonvalot4, Carla Braitenberg5, Jörg Ebbing6, Gerald Gabriel7,8, Andrej Gosar9, Adam Grand3, Hans-Jürgen Götze6, György Hetényi10, Nils Holzrichter6, Edi Kissling11, Urs Marti12, Bruno Meurers13, Jan Mrlina14, Ema Nogová3, Alberto Pastorutti5, Corinne Salaun15, Matteo Scarponi10, Josef Sebera6, Lucia Seoane4, Peter Skiba7, Eszter Szűcs16, Matej Varga17

1Earth Science Institute, Slovak Academy of Sciences, Bratislava, Slovak Republic; 2Department of Theoretical Geodesy and Geoinformatics, Slovak University of Technology, Bratislava, Slovak Republic; 3Department of engin. geology, hydrogeology and applied geophysics, Comenius University, Bratislava, Slovak Republic; 4Bureau Gravimétrique International, Toulouse and GET, University of Toulouse, France; 5Department of Mathematics and Geosciences, University of Trieste, Italy; 6Institute of Geosciences, Christian-Albrechts-University Kiel, Germany; 7Leibniz Institute for Applied Geophysics, Hannover, Germany; 8Institute of Geology, Leibniz University Hannover, Germany; 9Slovenian Environmental Agency, Seismology and Geology Office, and University of Ljubljana, Slovenia; 10Institute of Earth Sciences, University of Lausanne, Switzerland; 11Department of Earth Sciences, Federal Institute of Technology (ETH), Zürich, Switzerland; 12Federal Office of Topography Swisstopo, Wabern, Switzerland; 13Department of Meteorology and Geophysics, University of Vienna, Austria; 14Institute of Geophysics, Czech Academy of Sciences, Prague, Czech Republic; 15Service Hydrographique et Océanographique de la Marine, Brest, France; 16Geodetic and Geophysical Institute, RCAES, Hungarian Academy of Science, Sopron, Hungary; 17Department of Civil, Environmental and Geomatic Engineering, Federal Institute of Technology (ETH), Zürich, Switzerland

Veranstaltung: GeoKarlsruhe 2021

Datum: 2021

DOI: 10.48380/dggv-8n1d-ba25

The international networking initiative AlpArray Gravity Research Group (AAGRG) focused on the compiling homogeneous surface-based gravity datasets across the Alps and adjacent areas, on creating digital data sets for Bouguer and Free Air anomalies. In 2016/17 all ten countries around the Alps have agreed to contribute with point or gridded gravity data and data processing techniques to a recompilation of the Alpine gravity field in an area which is limited by 2° to 23° East and 41° to 51° North. For this recompilation, the group rely on existing national data.

The AAGRG decided to present the data set of the recalculated gravity fields on a 2km x 2km and 4km x 4km grid for the public. The densities used are 2670 kg/m3 for landmasses, 1030 kg/m3 for water masses above and -1640 kg/m3 below the ellipsoid. The correction radius was set to the Hayford zone O2 (167 km). The new Bouguer anomaly is compiled according to the most modern standards and reference frames (both location and gravity). Geophysical indirect effect and atmospheric corrections are also considered. In the Western Mediterranem (Ligurian Sea) completely reprocessed ship data of the Service Hydrographique et Océanographique de la Marine/Bureau Gravimétrique International were used. Marginal parts of the map were filled by GGM data.

Main aim of the work of the AAGRG is to release a gravity data base which can be used for high-resolution modelling, interdisciplinary studies from local to regional to continental scales, as well as for joint inversion with other datasets.

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