Research activities during the sabbatical stay in may july 2011
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RESEARCH ACTIVITIES DURING THE SABBATICAL STAY IN MAY-JULY 2011 PowerPoint PPT Presentation


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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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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


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


Regular Grid – dense lines

Papadopoulos et al., 2010, J.App.Geoph.


RADIAL ERT SURVEY


ΑΠΟΛΛΩΝΙΑ- 3D ERT


Apollonia 3D ERT


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


Model setup


Model setup


Synthetic Example


Synthetic Example


Synthetic Example


Synthetic Example


Synthetic Example


Synthetic Example


Resolution


Models

Correlation between initial model and inverted result


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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