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Open-File Report 2013–1028

Prepared in cooperation with the town of Woodbury, Connecticut

Mapping Bedrock Surface Contours Using the Horizontal-to-Vertical Spectral Ratio (HVSR) Method Near the Middle Quarter Area, Woodbury, Connecticut

By Craig J. Brown, Emily B. Voytek, John W. Lane, Jr., and Janet R. Stone

Thumbnail of and link to report PDF (11.8 MB)Summary

The bedrock surface contours in Woodbury, Connecticut, were determined downgradient of a commercial zone known as the Middle Quarter area (MQA) using the novel, noninvasive horizontal-to-vertical (H/V) spectral ratio (HVSR) passive seismic geophysical method. Boreholes and monitoring wells had been drilled in this area to characterize the shallow subsurface to within 20 feet (ft) of the land surface, but little was known about the deep subsurface, including sediment thicknesses and depths to bedrock (Starn and Brown, 2007; Brown and others, 2009). Improved information on the altitude of the bedrock surface and its spatial variation was needed for assessment and remediation of chlorinated solvents that have contaminated the overlying glacial aquifer that supplies water to wells in the area.

Revised March 6, 2013

First posted March 5, 2013

For additional information contact:
Office Chief
U.S. Geological Survey
New England Water Science Center
Connecticut Office
101 Pitkin Street
East Hartford, CT 06108
(860) 291-6740

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Suggested citation:

Brown, C.J., Voytek, E.B., Lane, J.W., Jr., and Stone, J.R., 2013, Mapping bedrock surface contours using the horizontal-to-vertical spectral ratio (HVSR) method near the middle quarter area, Woodbury, Connecticut: U.S. Geological Survey Open-File Report 2013–1028, 4 p., available at


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