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Geophysics Demonstration at DODEC 2002


The Branch of Geophysics conducted a hands-on near-surface geophysics demonstration at the 2002 annual meeting of the USGS Department of Defense Environmental Conservation (DODEC) Program.  DODEC 2002  was held April 30 - May 2, 2002, in Indianapolis, Indiana.

 [Photo: Participants in USGS Branch of Geophysics demonstration at DODEC 2002, Indianapolis, Indiana.]
Participants in USGS Branch of Geophysics demonstration at DODEC 2002, Indianapolis, Indiana.

 

Participants traveled from the conference site in Indianapolis to nearby Camp Atterbury to collect and analyze data using a capacitively coupled resistivity system.  At Camp Atterbury, participants visited the site of a former landfill.  There, they learned how to set-up the equipment and conduct a two-dimensional (2D) resistivity survey using the sample system.  

Photo: Branch of Geophysics scientist demonstrates assembly of equipment during DODEC 2002 demonstration, Camp Atterbury, Indiana.

Eric White of the Branch of Geophysics demonstrates assembly of equipment during DODEC 2002 demonstration, Camp Atterbury, Indiana.

Photo: USGS Branch of Geophysics scientists walk along transect as they conduct sample resistivity survey.

John Lane (left) and Eric White (right) of the Branch of Geophysics conduct sample resistivity survey. Equipment is attached to a  shoulder harness &  belt and pulled behind operator.

Photo: Equipment is attached to belt on operator via a cable. Survey transect is marked with flagging tape.

Demonstration participants conduct resistivity survey. Scientist in the distance is pulling the equipment, attached to a belt and shoulder harness.


 

[Photo: Equipment set up is shown. Operator carries console attached to harnass and belt. Equipment is attached to operator's belt by a cable. Receiver and transmitter are attached to cable and dragged on ground behind operator.]Capacitively coupled resistivity surveying is a geophysical method that measures the electrical properties in the ground to image beneath the ground surface.  This method can be used to detect lithologic and structural changes in the earth's subsurface, including variations in clay, water content and mineralization; weathering in faults and fractures; depth to bedrock; presence of contaminant plumes; shallow aquifers; and (or)  location of voids and cavities.

Using the data from the site, participants learned how apparent resistivity data can be inverted to create a model of the distribution of the "true" subsurface resistivity.

 [Image: Inverse model resistivity data collected at the site of a former landfill at Camp Atterbury, Indiana.]

 

 


For more information

OGW BG provides formal and informal geophysical training to USGS offices and staff on resistivity and other geophysical surveying methods. For an idea of the form and content of training you can expect from OGW BG staff, see an overview of a recent District training.

Also see how 2D resistivity methods can be used in marine surveys.

 

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Page Last Modified: Thursday, 03-Jan-2013 20:02:46 EST