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MRS: Cape Cod, Massachusetts, Field Work

A Joint Project of USGS, U.S. Environmental Protection Agency Region 5,
and Bureau de Recherches Géologiques et Minières (BRGM), France


[Photo:  Cape Cod field site showing truck]
Magnetic resonance sounding (MRS) surveys were conducted at Cape Cod, Massachusetts, in November 2001. The surveys were conducted in unconsolidated glacial sediments, primarily sands and silts. This study explored if and how MRS could be used to locate a borehole.
The data collected at Cape Cod were inverted to solve for estimated water content, relative permeability of the sediments, and the decay time of the magnetic resonance signal. The graphs below show, from left to right: water content and T1 decay time, in percent, with depth; relative permeability in meters per second, with depth; and the change in amplitude of the signal with time.

[Image: Graphs showing the results inverting the MRS data to get percent water content, relative permeability, and pulse decay time]

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