Summary
Crustal field models from CHAMP magnetic measurements are increasingly stable and reliable. In particular, they now allow for quantitative geological studies of crustal structure and composition. Here, we use a forward modeling technique to infer deep crustal structure of continental regions overlain by younger sediments. For this, a Geographical Information System (GIS) based technique has been developed to model the various geological units of the continental crust. Starting from geologic and tectonic maps of the world and considering the known rock types of each region, an average magnetic susceptibility value is assigned to every geological unit. Next, a vertically integrated susceptibility (VIS) is computed for each unit, taking into account the seismic crustal thickness, as given by models 3SMAC and CRUST2.1. From this preliminary VIS model, an initial vertical field anomaly map is computed at a satellite altitude of 400 km and compared with the corresponding CHAMP vertical field anomaly map. We demonstrate that significant geological inferences can be made from the agreement and the discrepancies between the predicted and observed anomaly maps. In particular, the lateral extent of Precambrian provinces under Phanerozoic cover is revealed.
Access provided by Autonomous University of Puebla. Download to read the full chapter text
Chapter PDF
Similar content being viewed by others
References
CGMW (2000) Geological Map of the World, Commission for the Geological Map of the World (CGMW) / © UNESCO Publishing.
Clark DA, Emerson DW (1991) Notes on rock magnetization characteristics in applied geophysical studies, Exploration Geophysics 22: 547–555.
Goodwin, AM (1991) Precambrian Geology, Academic Press, London.
Hunt CP, Moskowitz BM, Banerjee SK (1995) Magnetic properties of Rocks and Minerals, In: Rock Physics and Phase Relations-A handbook of Physical constants, AGU Reference shelf 3, ed. Ahrens TJ.
Langel RA, Hinze WJ (1998) The magnetic field of the Earth's Lithosphere — The satellite perspective, Cambridge University Press.
Maus S, Rother M, Holme R, Lühr H, Olsen N, Haak V (2002) First scalar magnetic anomaly map from CHAMP satellite data indicates weak lithospheric field. Geophys Res Lett 29(14).
Meyer J, Hufen J-H, Siebert M, Hahn A (1983) Investigations of the internal geomagnetic field by means of a global model of the earth's crust. J Geophys 52: 71–84.
Mooney WD, Laske G, Masters TG (1998) CRUST 5.1: A global crustal model at 50 × 50, J Geophys Res 103: 727–747.
Nataf H-C, Ricard Y (1996) 3SMAC: An a priori tomographic model of the upper mantle based on geophysical modeling. Phys Earth Planet Int 95: 101–122.
Purucker ME, Langel RA, Rajaram M, Raymond C (1998) Global magnetization models with a priori information. J Geophys Res 103: 2563–2584.
Taylor SR, McLennan SM (1985) The Continental Crust: Its composition and Evolution. Oxford: Blackwell Scientific Publ. 312pp.
Wasilewski PJ, Mayhew MA (1992) The Moho as a magnetic boundary revisited, Geophys Res Lett 19: 2259–2262.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2005 Springer-Verlag Berlin Heidelberg
About this chapter
Cite this chapter
Hemant, K., Maus, S., Haak, V. (2005). Interpretation of CHAMP Crustal Field Anomaly Maps Using Geographical Information System (GIS) Technique. In: Reigber, C., Lühr, H., Schwintzer, P., Wickert, J. (eds) Earth Observation with CHAMP. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-26800-6_39
Download citation
DOI: https://doi.org/10.1007/3-540-26800-6_39
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-22804-2
Online ISBN: 978-3-540-26800-0
eBook Packages: Earth and Environmental ScienceEarth and Environmental Science (R0)