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Durham University

Department of Earth Sciences

Profile

Publication details for Professor Richard Hobbs

Jegen-Kulcsar, M. & Hobbs, R.W. (2005), Joint Inversion of marine MT, Gravity and Seismic Data, in Ziska, H., Varming, T. & Bloch, Dorete eds, Annales Societatis Scientiarum Færoensis; Supplementum 43: Faroe Islands Exploration Conference 2004. Tórshavn, Faroese Academy of Sciences, Tórshavn, 163-167.

Author(s) from Durham

Abstract

Exploration of sub-basalt targets is difficult because the basalt units reflect and scatter seismic
energy, masking the characteristics of the underlying structure. Electromagnetic soundings are
less sensitive to the highly resistive basalt units but are strongly influenced by the characteristics
of the over and underlying sedimentary structures. So electromagnetic soundings are a valuable
compliment to seismic surveys in such areas.
We have developed a joint interpretation scheme and inversion algorithm of seismic, MT
(magneto-telluric) and gravity data that combines the information content in these data. While
each method in itself is able to resolve only a part of the subsurface, we demonstrate that our joint
inversion/interpretation technique allows us to identify the base of the basalt and yields
information about the underlying sediment.
Using synthetic data we demonstrate how the various data types contribute to our
inversion/interpretation technique, and show how we recover the sub-basalt structure. We then
apply this combined scheme on marine MT, satellite gravity and long-offset seismic data acquired
along FLARE-10 profile.
This work has been conducted under the EU funded SIMBA project and the FLARE-10 seismic
data were made available to us by Amerada Hess.