Journal of Geodynamics 39 (2005) 429–430 Preface Potential fields in geodynamics Potential ﬁelds in Geostatics and Geodynamics: Contributions from Geophysics, Geodesy, Geol- ogy, convened by W. Jacoby, Mainz, G. Strykowski, Copenhagen, and E. Grafarend, Stuttgart, was the fourth repetition of such a symposium during European Geophysical Society meetings. The present symposium was GD10 of EGS2003. As always, the symposium emphasized different approaches and various geodynamic facets especially of gravity. The potential fields play an important role in revealing and studying the geodynamic processes forming the Earth, and in spite of their notorious ambiguity of interpretation, inclusion of gravity information proves often crucial to successfully reduce the ambiguity. Ten orals and 34 posters covered a wide spectrum of topics. In magnetics, improvement of data analysis and reliability were emphasized, as well as geodynamics studies of the crustal evolution of Antarctica. Gravity contributions included methods of interpretation manifested in various studies of crust and upper mantle structures, for example, isostatic anomalies in continents, inversion for thermal and dynamic evolution of diverging plates, flexure and elastic thickness of the litho- sphere of Tibet, intracontinental orogenic belts, gravity power spectra and load bearing capacity of the Earth, Moon, Mars and Venus mantles, glacial loading and relaxation, and, finally, the geodetic aspects, the use of wavelet transformation in analysing CHAMP data and geoid determination. Grav- ity and magnetics were combined in many cases. Methodological aspects often interact with aims and results of interpretation. Geodesy pays more attention to mathematical correctness and theory. It is our experience that such a multidisciplinary forum, representing different aspects of potential fields science, yields a synergy of views and methodologies, whose combination is surely fertile for all involved. Nine papers of the symposium appear in this special issue of the Journal of Geodynamics. They are divided about half in half into the more geological–geophysical aspects and the more geodetic ones. Kaftan et al. tackle the problem of regional–local separation with a FE method. Strykowski et al. and Jacoby and Cavsak apply different approaches to the inversion of gravity anomalies over a large geological structure and over ocean ridges, respectively. Fernandez et al. and Marquart et al. consider temporal gravity variations over active volcanoes and in global CHAMP data, respectively. Schmidt et al. analyse the global gravity field by combining spherical harmonics and wavelets, while Grebenitcharsky et al. and Safari et al. combine gravity and GPS and also other data to determine the geoid in Canada and Iran, respectively. Finally, Varga treats the gross shape of Earth by considering the geometrical and geodynamic 0264-3707/$ – see front matter © 2005 Elsevier Ltd. All rights reserved. doi:10.1016/j.jog.2005.04.002

Potential fields in geodynamics

Download PDF Report

Upload
wolf-r-jacoby
View
218
Download
2

Embed Size (px)

Citation preview

Journal of Geodynamics 39 (2005) 429–430

Preface

Potential fields in geodynamics

Potential fields in Geostatics and Geodynamics: Contributions from Geophysics, Geodesy, Geol-ogy, convened by W. Jacoby, Mainz, G. Strykowski, Copenhagen, and E. Grafarend, Stuttgart, wasthe fourth repetition of such a symposium during European Geophysical Society meetings. The presentsymposium was GD10 of EGS2003. As always, the symposium emphasized different approaches andvarious geodynamic facets especially of gravity. The potential fields play an important role in revealingand studying the geodynamic processes forming the Earth, and in spite of their notorious ambigu-ity of interpretation, inclusion of gravity information proves often crucial to successfully reduce theambiguity.

Ten orals and 34 posters covered a wide spectrum of topics. In magnetics, improvement of dataanalysis and reliability were emphasized, as well as geodynamics studies of the crustal evolutionof Antarctica. Gravity contributions included methods of interpretation manifested in various stud-ies of crust and upper mantle structures, for example, isostatic anomalies in continents, inversionfor thermal and dynamic evolution of diverging plates, flexure and elastic thickness of the litho-sphere of Tibet, intracontinental orogenic belts, gravity power spectra and load bearing capacity ofthe Earth, Moon, Mars and Venus mantles, glacial loading and relaxation, and, finally, the geodeticaspects, the use of wavelet transformation in analysing CHAMP data and geoid determination. Grav-ity and magnetics were combined in many cases. Methodological aspects often interact with aims andresults of interpretation. Geodesy pays more attention to mathematical correctness and theory. It isour experience that such a multidisciplinary forum, representing different aspects of potential fieldsscience, yields a synergy of views and methodologies, whose combination is surely fertile for allinvolved.

Nine papers of the symposium appear in this special issue of theJournal of Geodynamics. They aredivided about half in half into the more geological–geophysical aspects and the more geodetic ones. Kaftanet al. tackle the problem of regional–local separation with a FE method. Strykowski et al. and Jacobyand Cavsak apply different approaches to the inversion of gravity anomalies over a large geologicalstructure and over ocean ridges, respectively. Fernandez et al. and Marquart et al. consider temporalgravity variations over active volcanoes and in global CHAMP data, respectively. Schmidt et al. analysethe global gravity field by combining spherical harmonics and wavelets, while Grebenitcharsky et al. andSafari et al. combine gravity and GPS and also other data to determine the geoid in Canada and Iran,respectively. Finally, Varga treats the gross shape of Earth by considering the geometrical and geodynamic