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Mississippi Alluvial Plain: Regional Geophysical Survey

May 7, 2021

In 2017, the USGS Mississippi Alluvial Plain (MAP) Regional Water Availability Study began an airborne geophysical mapping campaign to improve understanding of the geology and structure of the Mississippi River Valley alluvial aquifer. Two different airborne electromagnetic (AEM) platforms, the frequency-domain Resolve and time-domain Tempest, were flown by CGG Airborne. Regional surveys over the entire study area were acquired with both systems, providing multi-scale resolution of the aquifer system. In addition, a high-resolution inset grid was acquired near Shellmound, Mississippi.

View a detailed presentation of the Shellmound high-resolution inset grid and ground-based geophysical methods here. Explore the regional geophysical data collected to improve understanding of the geology and structure of the aquifer system.

geophysical visualization showing 3 layers of data
Cover image from a USGS story map showing the 3D visualization of the Mississippi Alluvial Plain aquifer. Three layers are shown: surface connectivity (top, projected on land surface), average aquifer resistivity (middle), and aquifer base connectivity (bottom, projected on aquifer base). View the Mississippi Alluvial Plain Geophysical Survey Geonarrative to see a three-dimensional view into the Mississippi Alluvial Plain subsurface and for additional information .