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Imaging near surface formation using TEM and ERT methods: A case study from the western coast of India.

Kattula BR,. Chandra S.

JOURNAL OF APPLIED GEOPHYSICS

https://doi.org/10.1016/j.jappgeo.2025.105875 

This study assesses the enhancement in the resolution of AEM data for shallow features, specifically at depths of approximately 3-4 meters and below, which is essential for hydrogeological applications, particularly in imaging recharge pathways, among other aspects. The enhanced shallow resolution of the low moment AEM data is found to be comparable to the resolution achieved through ERT measurements utilizing a 10-meter unit electrode spacing. Correlations between grain size and lithology substantiate the shallow resolution of LM AEM data, making it a highly effective tool for characterizing sediment characterization, which are vital for effective groundwater management and recharge planning.

Fig: Airborne Transient Electromagnetic (AEM) resistivity profile using LCI inversion of LM AEM data with and without system response correction and on-time modeling. The AEM resistivity validated against grain size and lithology. Cross-section showing AEM, ERT, and ground TEM, along with interpreted lithology and translated hydrogeological model.

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