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- Title
Architecture and temporal variations of a terrestrial CO degassing site using electric resistivity tomography and self-potential.
- Authors
Nickschick, Tobias; Flechsig, Christina; Meinel, Cornelia; Mrlina, Jan; Kämpf, Horst
- Abstract
The Hartoušov mofette field in NW Bohemia, Czech Republic, is characterized by strong CO degassing from the Lithospheric Mantle. In a test survey using electrical resistivity tomography, we observed changes over time in the subsurface structure beneath heavily CO degassing spots to depths of about 40 m and compared them to CO gas flux and soil gas mappings from previous studies. Changes in the electrical resistivity were measured between September 2012 and October 2013 at irregular intervals and highlight large variations in the resistivity distribution where the CO degassing was strongest (56 × 103 g m day), indicating a fluid-induced change of properties of the underlying clayey sediments. Positive and negative anomalies in the electric self-potential parallel to the ERTs can be found where CO degassing occurs which indicates varying ascent or descent of fluids within these spots. Some degassing spots seem not to be actively degassing continuously over time, which can also be observed by other studies in the same area. We suggest that future gas mappings are accompanied by methods that observe the state of fluid systems at subsurface over time, e.g. electric resistivity tomography and self potential.
- Subjects
ELECTRICAL resistivity; TOMOGRAPHY; SOIL air; LITHOSPHERE; DEGASSING of metals
- Publication
International Journal of Earth Sciences, 2017, Vol 106, Issue 8, p2915
- ISSN
1437-3254
- Publication type
Article
- DOI
10.1007/s00531-017-1470-0