Identification and Verification of the Movement of the Hidden Active Fault Using Electrical Resistivity Tomography and Excavation
Issued Date
2024-08-01
Resource Type
eISSN
20763263
Scopus ID
2-s2.0-85202635119
Journal Title
Geosciences (Switzerland)
Volume
14
Issue
8
Rights Holder(s)
SCOPUS
Bibliographic Citation
Geosciences (Switzerland) Vol.14 No.8 (2024)
Suggested Citation
Arjwech R., Hongsresawat S., Chaisuriya S., Rattanawannee J., Kanjanapayont P., Youngme W. Identification and Verification of the Movement of the Hidden Active Fault Using Electrical Resistivity Tomography and Excavation. Geosciences (Switzerland) Vol.14 No.8 (2024). doi:10.3390/geosciences14080196 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/100965
Title
Identification and Verification of the Movement of the Hidden Active Fault Using Electrical Resistivity Tomography and Excavation
Corresponding Author(s)
Other Contributor(s)
Abstract
Identifying the movement of the branches of the hidden Thakhek fault in Thailand is challenging due to the absence of evident landforms indicating an active fault. In this study, we analyzed a digital elevation model (DEM) to identify potential landforms. A 2D Electrical Resistivity Tomography (ERT) survey was conducted to locate the hidden Thakhek fault. The results reveal vivid images of resistivity contrast, interpreted as two reverse faults, with mudstone exhibiting low resistivity in the middle, flanked by thick sediment layers with higher resistivity. Three trenches were excavated perpendicular to the two interpreted reverse faults. The displacement of reverse faulting appears to have shifted mudstone over Quaternary sediments, with vertical offsets revealed in trenches NWY-1, NWY-2, and NWY-3. This movement could be identified as a positive flower structure. Additionally, lakes are identified as a negative flower structure along the traces. These features result from strike-slip strains under a locally appropriate compressional and extensional environment in a shearing strike-slip fault.