112 Geophysics in Investigating and Exploring for Mineral, Energy and Groundwater Resources (Posters)

Abstracts are requested for research that incorporates geophysics to investigate and explore for mineral, energy and groundwater resources.

Monday, 20 October 2025
8:00 AM - 5:30 PM
HBGCC, Hall 1

Ground-Based and Airborne Geophysics Reveal New Insights Into Local Bedrock Topography

Paper number: 112-2
Program: Technical Sessions
Time: 8:00 AM – 8:00 AM

Authors

Abstract

We used 2-dimensional electrical resistivity tomography (ERT)  and passive-seismic data processed using the horizontal-to-vertical spectral ratio (HVSR) technique to support a helicopter time-domain electromagnetic (HTEM) project in northern Illinois.  The HTEM campaign is the first geophysical dataset to cover this study area with high resolution subsurface data.  This region includes a deeply incised bedrock valley that plays an important role in groundwater resources in the region.  HTEM data have revealed new topographic features that suggest changes to previous interpretations of bedrock topography.  To corroborate features found in HTEM data, we collected 16 HVSR soundings and around 2800 meters of ERT data along a single profile across a new bedrock tributary reflected in the HTEM data.  These surface-based geophysical datasets help us to better assess the utility and impact of airborne geophysical methods in near-surface geologic and hydrogeologic characterization of glacial environments.

Geological Society of America Abstracts with Programs. Vol. 57, No. 6

doi: 10.1130/abs/2025AM-413700

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