Summary Abstract: To understand the subsurface properties of polygonal patterned ground (PPG) and to attempt to resolve competing theories of PPG activity, non-invasive, non-destructive geophysical methods were used to obtain three dimensional images of the subsurface beneath PPG at two sites in the Dry Valleys: Victoria Valley and Beacon Valley. In Victoria Valley an initial reconnaissance of the area was completed, two polygon sets and a long transect line was selected for surveys. The first polygon set was surveyed with 3D ground penetrating radar (GPR) and photogrammetry, then with time lapse electrical resistivity tomography (ERT). The second polygon was surveyed with ERT and photogrammetry and then with lapse 3D GPR. Detailed topography was acquired over the second polygon and each polygon set was finally surveyed with horizontal loop electromagnetic system (HLEM) for lateral electrical conductivity variations. The long transect ran from near the top of the ridge to the SW of the upper Victoria Valley to the other side of the narrows in the lower Lake Victoria. The transect was initially profiled using ERT, then a series of contiguous, sometimes overlapping time-domain EM soundings were acquired in the valley along the transect. A deep GPR profile was acquired and a total magnetic field survey line was completed. Finally, the topography of the transect was surveyed. These geophysical images target the deeper bedrock and massive ice targets. In Beacon Valley an initial reconnaissance of the area was completed and two polygons were selected for detailed geophysical imaging and a 1.2km transect running NW-SE across the valley was completed for large-scale deeper structure and stratigraphy. The two polygons were both surveyed using 3D GPR imaging, ERT, HLEM and detailed topography. Deep GPR and ERT profiles, as well as topographic surveys were acquired along the transect.

Geographic Coverage

N: -77.3365

S: -77.3365

E: 161.6203

W: 161.6203

N: -77.8475

S: -77.8475

E: 160.5956

W: 160.5956

Temporal Coverage

Start Date: 2006-11-27

Stop Date: 2007-01-22

Location Keywords

CONTINENT > ANTARCTICA > VICTORIA VALLEY CONTINENT > ANTARCTICA > BEACON VALLEY GEOGRAPHIC REGION > POLAR

Science Keywords

CRYOSPHERE >SNOW/ICE >PERMAFROST    [Definition]

LAND SURFACE >SOILS >ELECTRICAL CONDUCTIVITY    [Definition]

LAND SURFACE >SOILS >PERMAFROST    [Definition]

LAND SURFACE >SOILS >SOIL DEPTH    [Definition]

LAND SURFACE >TOPOGRAPHY >TOPOGRAPHICAL RELIEF    [Definition]

LAND SURFACE >TOPOGRAPHY >TERRAIN ELEVATION    [Definition]

SPECTRAL/ENGINEERING >RADAR >RADAR IMAGERY    [Definition]

SPECTRAL/ENGINEERING >SENSOR CHARACTERISTICS >PHASE AND AMPLITUDE    [Definition]

SOLID EARTH >GEOMAGNETISM >ELECTRICAL FIELD    [Definition]

SOLID EARTH >GEOMAGNETISM >MAGNETIC FIELD >MAGNETIC ANOMALIES    [Definition]

SOLID EARTH >GEOMAGNETISM >MAGNETIC FIELD    [Definition]

SPECTRAL/ENGINEERING >SENSOR CHARACTERISTICS >ELECTRICAL PROPERTIES

CRYOSPHERE >FROZEN GROUND >ACTIVE LAYER    [Definition]

CRYOSPHERE >FROZEN GROUND >PERMAFROST    [Definition]

CRYOSPHERE >FROZEN GROUND >PERIGLACIAL PROCESSES    [Definition]

LAND SURFACE >FROZEN GROUND >ACTIVE LAYER    [Definition]

LAND SURFACE >FROZEN GROUND >GROUND ICE    [Definition]

LAND SURFACE >FROZEN GROUND >PERIGLACIAL PROCESSES    [Definition]

LAND SURFACE >FROZEN GROUND >PERMAFROST    [Definition]

ISO Topic Category

GEOSCIENTIFIC INFORMATION

Platform

FIELD SURVEYS    [Information]

FIELD INVESTIGATION    [Information]

Instrument

GPR >Ground Penetrating Radar    [Information]

Quality

All of the surveys and data are backed up on CD or DVD. The files are raw data files and often quite large (e.g. many Mbytes for ONE radar file). Please contact the investigator for access.

Keywords

POLYGONAL PATTERNED GROUND

TOPOGRAPHY

Data Set Progress

COMPLETE

Originating Center

Data Center

Antarctica New Zealand, New Zealand Antarctic Institute, New Zealand    [Information] Data Center URL: http://www.antarcticanz.govt.nz/ Data Center Personnel Name: SHULAMIT GORDON Phone: +64 3 358 0200 Fax: +64 3 358 0211 Email: s.gordon at antarcticanz.govt.nz Contact Address: Antarctica New Zealand Private Bag 4745 City: Christchurch Country: New Zealand

Personnel

DAVID NOBES Role: INVESTIGATOR Phone: +64 3 364 2987 ext 7733 Fax: +64 3 364 2769 Email: david.nobes at canterbury.ac.nz Contact Address: Department of Geological Sciences University of Canterbury City: Private Bag 4800 Province or State: Christchurch Postal Code: 8140 Country: NEW ZEALAND

CEISHA POIROT Role: DIF AUTHOR Phone: +64 3 358 0200 Fax: +64 3 358 0211 Email: c.poirot at antarcticanz.govt.nz Contact Address: Antarctica New Zealand Private Bag 4745 City: Christchurch Country: New Zealand

SHULAMIT GORDON Role: DIF AUTHOR Phone: +64 3 358 0200 Fax: +64 3 358 0211 Email: s.gordon at antarcticanz.govt.nz Contact Address: Antarctica New Zealand Private Bag 4745 City: Christchurch Country: New Zealand

Creation and Review Dates

DIF Creation Date: 2008-12-08 Last DIF Revision Date: 2009-03-16

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