Aquifer systems extending far offshore on the U.S. Atlantic margin

Further northeast, low salinities seen in well data from onshore Martha’s Vineyard10 and Nantucket11 have also suggested low-salinity submarine groundwater is present, although there has been no offshore drilling to confirm this hypothesis. We used a recently developed surface-towed controlled source EM (CSEM) system16 in combination with the passive-source magnetotelluric (MT) method to map low-salinity groundwater systems in two locations on the US Atlantic coast: offshore Martha’s Vineyard and New Jersey (Fig. 1). Direct pore water salinity measurements offshore New Jersey correspond well with our resistivity model (Fig. 2d).

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