North American Database of Archaeological Geophysics

Image Library (by location): Virginia (VA)

Sorted alphabetically by site name

Conductivity GPR Induced Polarization Magnetic Magnetic susceptibility Metal detector Multiple Methods Seismic Refraction Self Potential Resistance/Resistivity

(to view an enlargement of a graphic, click on it)

Fort Morton (Petersburg National Battlefield)

A high frequency (315 MHz) antenna GPR profile over the trenches of the bombproofs at Fort Morton;		Radar echoes of the Bombproof;		GPR profiles of the Iron detail;
Contour map of the Fort Morton magnetic survey (2.5, 10, and 100 nT contours);		A surface plot of the magnetic field at Fort Morton;		A smoothed magnetic contour map of the Bombproof detail;
Magnetic contour maps of the Iron detail (100 nT contour interval);		Magnetic contour map showing objects behind the main fortification trench;		Magnetic gradiometer map of the Iron detail;
A smoothed EM38 conductivity map of Fort Morton;		A smoothed EM38 conductivity map of the Bombproof detail;		The EM31 conductivity of the Trench detail. This map reveals a lateral gradient and a line of lows near E500;
EM31 and EM38 conductivity maps of the small Iron detail;		A magnetic susceptibility contour map of the Iron detail measured with the EM38;		A smoothed resistivity map of the Bombproof detail;
A surface map of electrical resistivity;		A smoothed resistivity map of the Trench detail;		A resistivity contour map of the Iron detail;
Soil voltages at the Iron detail;		A self-potential profile across the main fortification trench;		A self-potential profile across the Bombproof detail;
A self-potential map made over the Iron detail area;		Examples of seismic signals at Fort Morton;		A seismic recording from 12 geophones;
Seismic refraction travel time at the Bombproof shelter;

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