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Abstract

Summary

Studies have shown that Grounded Electrical-Source Airborne Transient ElectroMagnetics (GREATEM) is a promising method for modelling three-dimensional (3-D) resistivity structures in coastal areas, in addition to inaccessible areas such as volcanoes, mountains and deep forest cover. To expand the application of the GREATEM system, a 3-D resistivity model that considers large lateral resistivity variations is required. In this study, we present a frequency-domain 3-D electromagnetic inversion approach that can be applied to time domain data from GREATEM. To deal with a huge number of grids and wide range of frequencies in airborne datasets, a method for approximating sensitivities is introduced for efficient 3-D inversion. Approximate sensitivities are derived by replacing adjoint secondary electric fields with those computed in the previous iteration. These sensitivities can reduce the computation time without significant loss of accuracy.

We verified our inversion approach using electromagnetic response generated from two synthetic models that consist of one conductor and two conductors buried in a host resistive half-space. The inverted results were able to recover conductive zones of potential interest within the resistive region. These results are in good agreement with the synthetic model, confirming the accuracy of our inversion approach.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.201413869
2015-09-06
2024-04-19

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References

  1. Han, N., Myung, N., Hee, K., Tae, L., Yoonho, S. and JungH.
    [2008] Efficient three-dimensional inversion of magnetotelluric data using approximate sensitivities. Geophysics Journal International, 175, 477–485.
     [Google Scholar]
  2. Hoerdt, A., Vladimir, D., Leonid, K. and Kurt-Martin, S.
    [1992] Interpretation of 3D effects in long-offset transient electromagnetic (LOTEM) soundings in the munsterland area/Germany. Geophysics, 57, 1127–1117.
     [Google Scholar]
  3. Femonko, E. and Mogi, T.
    [2002] A new computation method for a staggered grid of 3-D EM field conservative modeling. Earth Planets and Space, 54, 499–509.
     [Google Scholar]
  4. Mogi, T., Kusunoki, K., Kaieda, H., Ito, H., Jomori, A., Jomori, N. and Yuuki, Y.
    [2009] Grounded electrical-source airborne transient electromagnetic (GREATEM) survey of Mount Bandai, northeastern Japan. Exploration Geophysics, 40, 1–7.
     [Google Scholar]
  5. Mogi, T., Tanaka, Y., Kusunoki, K., Morikawa, T. and Jomori, N.
    [1998] Development of Grounded Electrical Source Airborne Transient EM (GREATEM). Exploration Geophysics, 29, 61–64.
     [Google Scholar]
  6. Sasaki, Y., Jong, Y., Choi, J. and Son, J.
    [2015] Frequency and time domain three-dimensional inversion of electromagnetic data for a grounded-wire source. Journal of Applied Geophysics, 112, 106–114.
     [Google Scholar]
  7. Sasaki, Y.
    [2004] Three-dimensional inversion of static-shifted magnetotelluric data. Earth Planets and Space, 56, 239–248.
     [Google Scholar]
  8. Strack, M.
    [1992] Exploration with deep transient electromagnetics. Elsevier Science, 373.
     [Google Scholar]
  9. Steuer, A., Siemon, B. and Auken, E.
    [2009] A comparison of helicopterborne electromagnetics in frequency- and time-domain at the Cuxhaven valley in Northern Germany. Applied Geophysics, 67, 194–205.
     [Google Scholar]
  10. Vrbancich, J. and Fullagar, K.
    [2007] Towards remote sensing of sediment thickness and depth to bedrock in shallow seawater using airborne TEM. Exploration Geophysics, 38, 77–88.
     [Google Scholar]
  11. Loke, H. and Barker, R.
    [1996] Practical techniques for 3D resistivity surveys and data inversion. Geophysics Prospecting. 44, 499–523.
     [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201413869
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3-D Inversion of the Grounded Electrical-source Airborne Transient Electromagnetic (GREATE) Survey Data
Conference Proceedings 2015, 1 (2015); https://doi.org/10.3997/2214-4609.201413869
/content/papers/10.3997/2214-4609.201413869
/content/papers/10.3997/2214-4609.201413869
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