Details of the abstract
| Title of paper | Magnetotelluric imaging of a shallow groundwater system in central Zagros, Iran |
| List of authors | Montahaei, M. |
| Affiliation(s) | Institute of geophysics, University of Tehran, Tehran, Iran |
| Summary |
The results of an AMT exploration carried out in the Mond river basin, Bushehr province, southwest Iran are presented in this study. We aim to find the overall conductivity structure of the geological features controlling the aquifer in a basin where subsurface structure is little known. Dimensionality analysis of the data was performed by the phase tensor and the WAL invariants and distortion effects were removed employing the Groom-Baily decomposition method. Distortion corrected data were then modeled by a 2D smooth inversion approach and the results were further explored by applying sensitivity analysis to find the range of relevant models representing shallow aquifer system in the study area. 2D smooth inversion resolves a shallow conductive layer, extending throughout the model and a resistive basement detached by a moderately conductive zone. Another conductive anomaly exists at deep part beneath the NW of the profile. A different class of resistivity model was derived using a distinct regularization approach which seeks the smoothest variation away from a starting model. The result shows the possible brine circulation between water-filled fractures constituting the conductor in the deep part of the model and the shallow alluvial aquifer layer. |
| Session Keyword | 3.0 Exploration, Monitoring and Hazards |
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