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Tomography
Observation of the internal structure of an object or, as is more typical in USGS research, a cross section of the earth's crust by changing the relative orientation of a signal generator, a sensor, or both.
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USGS develops geophysical methods to improve remediation monitoring and site characterization [More info]
Short news article describing the use of electrical resistivity tomography to improve imaging of tracer flow in ground water.
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