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RESEARCH ARTICLE
Contents Vol 40(1)

Detection of cavities in a karst area by means of a 3D electrical resistivity technique

Samgyu Park 1 2 Changryol Kim 1 Jung-Sul Son 1 Myeong-Jong Yi 1 Jung-Ho Kim 1
+ Author Affiliations
- Author Affiliations

1 Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources (KIGAM), 92 Gwahang-no, Yuseong-gu, Daejeon 305-350, Korea.

2 Corresponding author. Email: samgyu@kigam.re.kr

Exploration Geophysics 40(1) 27-32 https://doi.org/10.1071/EG08114
Submitted: 13 November 2008  Published: 27 February 2009

Abstract

In this study, we examined the applicability of a 3D electrical resistivity technique for the probing of underground cavities at a field test site in a karst area in Yongweol-ri, Muan-gun, in the south-western part of the Korean peninsula. At the test site, where the ground has subsided in the past, underground cavities are commonly found in the limestone bedrock, which is overlain with alluvial deposits. The limestone cavities at the test site are mostly filled with groundwater and clay; hence, they show levels of electrical resistivity that are significantly lower than those of the surrounding host bedrock. The results of this study demonstrate that the zones of low resistivity correspond to the zones of the cavities identified in the boreholes at the site, and that our 3D electrical resistivity survey is a very effective tool for detecting and mapping underground cavities in a karst area.

Key words: electrical resistivity, ground subsidence, limestone cavity, 3D imaging technique.


Acknowledgments

This research was supported by the Basic Research Project of the Korea Institute of Geoscience and Mineral Resources, which is funded by the Korean Ministry of Knowledge Economy. The authors thank the ministry for its financial support.


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