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Geophysical and Petrological Applications of New-Generation Satellite-Derived Gravity data With a Focus on Hazardous and Frontier Regions

Ron Hackney(1), Romain Bousquet(2), Hans-Jürgen Götze(1), Rezene Mahatsente(1), Thomas Jahr(3), Gerhard Jentzsch(3) and Roland Oberhänsli(2)

(1) Universitaet Kiel, Otto-Hahn-Platz 1, 24118 Kiel, Germany
(2) Universitaet Potsdam, Karl Liebknecht str. 24-27, 14476 Potsdam, Germany
(3) Universität Jena, Burgweg 11, 07749 Jena, Germany

Abstract

As part of the Germany Priority Program "Mass Transport and Mass Distribution and in the Earth System", we are proposing to take advantage of new-generation satellite-derived gravity and gradient data from CHAMP, GRACE and, in particular, GOCE for studies of the crust and upper mantle in hazardous and frontier regions. These new models provide gravity information (1) for areas previously lacking data and (2) that is continuous and consistent across natural and artificial boundaries. We will develop and test methods for dealing with the new satellite gravity and gradient data in geophysical applications (computation of Bouguer anomalies, satellite gravity data for regional–residual field separation). In order to ascertain the degree to which the satellite data resolve lithospheric structures, we will also compare the satellite data to gravity and gradients predicted from existing 3D density models. New petrologically- and thermodynamically-based methods will be used to constrain density independently of gravity data. These methods will be tested against satellite gravity data and used in our models of frontier regions and subduction zones. In selected frontier regions, new gravity models constrained by satellite data will extend existing interpretations and demonstrate the use of the new-generation satellite gravity data in geophysical applications. In subduction zones, we will integrate static density modelling and finite-element modelling to study asperities and to examine the temporal variation of the gravity field in response to fore-arc deformation.

 

Workshop poster

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry