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RESEARCH ACTIVITIES DURING THE SABBATICAL STAY IN MAY-JULY 2011

RESEARCH ACTIVITIES DURING THE SABBATICAL STAY IN MAY-JULY 2011 . Dr. Panos Tsourlos Associate Professor Department of Geophysics, Aristotle University of Thessaloniki, GREECE. Supported by the KOFST “Brainpool” Program and KIGAM. 3D ERT TUMULI INVESTIGATION: RADIAL ARRAYS ?.

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RESEARCH ACTIVITIES DURING THE SABBATICAL STAY IN MAY-JULY 2011

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  1. RESEARCH ACTIVITIESDURING THE SABBATICAL STAY IN MAY-JULY 2011 Dr. Panos TsourlosAssociate ProfessorDepartment of Geophysics, Aristotle University of Thessaloniki, GREECE Supported by the KOFST “Brainpool” Program and KIGAM

  2. 3D ERT TUMULI INVESTIGATION: RADIAL ARRAYS ? Generally, tumuli have great historical and archaeological significance Geophysical investigation of tumuli is a particularly difficult problem 3D ERT measurements in regular and radial grids are considerred in this research

  3. Regular Grid – dense lines Papadopoulos et al., 2010, J.App.Geoph.

  4. RADIAL ERT SURVEY

  5. ΑΠΟΛΛΩΝΙΑ- 3D ERT

  6. Apollonia 3D ERT

  7. Model setup Radial Array 1m spacing 19 electrodes – 18m length Lines every 9 deg. Total of 19 lines, 361 electrodes PD forward Reverse 6726 Regular Grid array 1m spacing 19 electrodes – 18m length Lines every 9 deg. Total of 19 lines, 361 electrodes PD forward Reverse 6726 measurements Combined 12452 measurements 657 electrodes

  8. Model setup

  9. Model setup

  10. Synthetic Example

  11. Synthetic Example

  12. Synthetic Example

  13. Synthetic Example

  14. Synthetic Example

  15. Synthetic Example

  16. Resolution

  17. Models Correlation between initial model and inverted result

  18. Preliminary Conclusions • Radial ERT mode exhibits symmetrical sensitivity which is increased over the center of the tumulus • Generally for central parts of models produced better results than regular measuring mode • Sensitivity is reduced at the edges due to sparser electrodes • Exhibits radial artefacts which is due to sensitivity pattern and can be reduced if array is extended several (3-4) electrodes either side of the tumulus • Combined use of radial and regular mode seems to produce superior results. Draft Manuscript: Radial ERT Measuring mode for Tumuli Investigation Co-authored: M-J Yee, J-H Kim (KIGAM) N. Papadopoulos (IMS FORTH)

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