This session deals with problems associated with the derivation, interpretation and use of geomagnetic indices both in theory and practice. A forum is also provided for a discussion of new indices and questions about existing indices. Geomagnetic indices contributions to space weather programs will be welcome. Improvements in geological interpretation of such surveys are gained both from the improved spatial and frequency resolution and the further processing techniques which can be applied with greater confidence than before. Papers are sought which illustrate all aspects of these high-resolution surveys from acquisition and processing to their interpretation.
Case studies highlighting the advantages gained over conventional surveys are particularly welcome.
Recent measurements, particularly seismic reflection measurements with powerful sources as well as observations with closely spaced ocean bottom seismometers, are of great interest. New interpretations through the development of new concepts and ideas are invited. Models starting with assumptions of specific stress and temperature regimes and theological properties of the crust and mantle and which go on to predict the evolution of margins and the present geophysical signatures are needed to better understand the geological evolution of margins. Interpretation of presently available data and the recognition of the difficulties, ambiguities and pitfalls encountered in interpretation are especially valuable. The importance of the initial lines of weakness in the location of the split merits discussion.