Analog dial gage (left) and a digital linear potentiometer (right)
Detailed Description
An analog dial gage (left) and a digital linear potentiometer (right with blue barrel) used to measure land-surface movement in response to aquifer system deformation at the USGS Nansemond extensometer. The potentiometer is the primary instrument for the extensometer with a resolution of about 0.00001 feet (0.003048 millimeters) and a travel range of 0.328084 feet (100 millimeters). The dial gage can be read to a precision of 0.0001 inches and has a range of 1 inch.
Sources/Usage
Public Domain.
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Check out more images of our Nansemond research site below:
USGS Extensometer Drilling in Virginia
Along the Atlantic Coast, a 2000+ ft deep hole has been drilled by the USGS to assess the issues of groundwater pumping, relative sea-level rise, and land subsidence. This video shows the drilling of the first extensometer to measure land subsidence in the North Atlantic Coastal Plain in 30+ years.
Related Content
- Multimedia
Check out more images of our Nansemond research site below:
USGS Extensometer Drilling in Virginia
Along the Atlantic Coast, a 2000+ ft deep hole has been drilled by the USGS to assess the issues of groundwater pumping, relative sea-level rise, and land subsidence. This video shows the drilling of the first extensometer to measure land subsidence in the North Atlantic Coastal Plain in 30+ years.