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Geophysical Mapping of Shallow Rock Salt at Borabue, Northeast ThailandNormal access

Authors: T. Sarntima, R. Arjwech and M.E. Everett
Journal name: Near Surface Geophysics
Issue: Vol 17, No 4, August 2019 pp. 403 - 416
DOI: 10.1002/nsg.12052
Language: English
Info: Article, PDF ( 2.38Mb )
Price: € 30

Summary:
In the northeast of Thailand, many swamps and lakes show evidence of rock salt dissolution, with attendant environmental problems due to saline groundwater and soil salinization. The knowledge of the depth and structure of the rock salt would be useful to achieve a better understanding of the impact of its dissolution on the environ-ment and to facilitate effective land management strategies. Geophysical methods can provide key subsurface information. Four seismic refraction profiles and three elec-trical resistivity tomography profiles were carried out between Nong Bo and Nong Pong reservoirs in the salt-affected Borabue district of Maha Sarakham province. The seismic results indicate the top of shallow rock salt beneath Nong Bo reser-voir as a diagnostic zone of high P-wave velocity >3400 m/s at depths >20 m. The electrical resistivity tomography investigation shows electrical resistivity values 5 m at similar depths, indicative also of shallow rock salt. Zones interpreted to be saline groundwater are electrically conductive, identified by electrical resistivity values 5


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