We describe a transient electromagnetic survey to image the resistivity structure of the hydrate vent CNE03, offshore Mid-Norway which located approximately 10 km north of the Storegga Slide sidewall. The experiment is unique in that the electric dipole transmitter has two polarizations for each transmission station. Furthermore, the newly designed transmitter is deployed in a pogo-style acquisition, which is suitable for a detailed investigation of a small scale seafloor target. The geometry of the experiment makes conventional interpretation methods difficult so that we simplify the data by creating a single rotationally invariant quantity from the original four electric field measurements (two electric field measurements for two transmitter polarizations). This invariant is further reduced to an apparent resistivity, which is useful for rapid resistivity mapping of the seafloor. Results show that CNE03 is characterized by increased apparent resistivities which correlate well with increased P-wave velocities determined from ocean bottom seismometer measurements.


Article metrics loading...

Loading full text...

Full text loading...


  1. Bünz, S., Mienert, J. and Berndt, C.
    [2003] Geological controls on the Storegga gas-hydrate system of the mid-Norwegian continental margin. Earth and Planetary Science Letters, 209, 291–307.
    [Google Scholar]
  2. Hölz, S., Swidinsky, A. and Jegen, M.
    [2013] The use of rotational invariants in the interpretation of marine CSEM data. MARELEC conference, Hamburg, Germany, July16–19.
    [Google Scholar]
  3. Plaza-Faverola, A.
    [2010] Characterization of sub-seabed fluid flow and hydrate systems at Nyegga, offshore mid-Norway. PhD thesis, University of Tromso.
    [Google Scholar]
  4. Swidinsky, A., Hölz, S. and Jegen, M.
    [2013] Rapid resistivity imaging using a transient marine CSEM survey with two transmitter polarizations. EAGE conference, London, UK, June10–13.
    [Google Scholar]
  5. Sommer, M., Hölz, S., Moorkamp, M., Swidinsky, A., Heincke, B., Scholl, C. and Jegen, M.
    [2013] GPU parallelization of a three dimensional marine CSEM code. Computers & Geosciences, 58, 91–99.
    [Google Scholar]

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