1887

Abstract

Summary

Knowledge of the sensitivity function of an electromagnetic (EM) system helps to assess the advantages and shortcomings of the system set-up. We have computed 3D sensitivity functions of three different EM systems – one airborne (SkyTEM) and two ground-based systems (tTEM and GCM) – in order to compare the sensitivity distribution of the different transmitter-receiver set-ups. The results show that the GCM has the highest sensitivity to near-surface structures, but also has a very limited footprint depth. The SkyTEM and tTEM systems have comparable sensitivities vertically in the ground with a 90% footprint depth around 5 m for early time measurements. However, the sensitivity of the SkyTEM system is distributed must wider horizontally than the tTEM.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201702150
2017-09-03
2024-04-16
Loading full text...

Full text loading...

References

  1. Auken, E., Christiansen, A. V., Kirkegaard, C., Fiandaca, G., Schamper, C., Behroozmand, A. A., Binley, A., Nielsen, E., Effersø, F., Christensen, N. B., Sørensen, K. I., Foged, N. & Vignoli, G.
    [2014]. An overview of a highly versatile forward and stable inverse algorithm for airborne, ground-based and borehole electromagnetic and electric data. Explor. Geophys, 1–13.
    [Google Scholar]
  2. Christensen, N. B.
    [2014]. Sensitivity functions of transient electromagnetic methods. Geophysics, 79, E167–E182.
    [Google Scholar]
  3. Farquharson, C. & Oldenburg, D.
    [1996]. Approximate sensitivities for the electromagnetic inverse problem. Geophysical Journal International, 126, 235–252.
    [Google Scholar]
  4. Hördt, A.
    [1998]. Calculation of electromagnetic sensitivities in the time domain. Geophysical Journal International, 133, 713–720.
    [Google Scholar]
  5. Mcgillivray, P., Oldenburg, D., Ellis, R. & Habashy, T.
    [1994]. Calculation of sensitivities for the frequency-domain electromagnetic problem. Geophysical Journal International, 116, 1–4.
    [Google Scholar]
  6. Sørensen, K. I. & Auken, E.
    [2004]. SkyTEM - A new high-resolution helicopter transient electromagnetic system. Exploration Geophysics, 35, 191–199.
    [Google Scholar]
  7. Tølbøll, R. J. & Christensen, N. B.
    [2007]. Sensitivity functions of frequency-domain magnetic di-pole-dipole systems. Geophysics, 72,F45–F56.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201702150
Loading
/content/papers/10.3997/2214-4609.201702150
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error