Original Article

Econ. Environ. Geol. 2017; 50(6): 487-495

Published online December 31, 2017

https://doi.org/10.9719/EEG.2017.50.6.487

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Imaging Inner Structure of Bukbawi at Mt. Palgong Provincial Park Using Ground Penetrating Radar

Hyeong-Gi Kim1, Seung-Ho Baek1, Seung-Sep Kim1,2*, Na Young Lee3 and Jang-Soon Kwon4

1Department of Astronomy, Space Science and Geology, Chungnam National University, Daejeon 34134, South Korea
2Department of Geology and Earth Environmental Sciences, Chungnam National University, Daejeon 34134, South Korea
3Faculty of Earth Systems and Environmental Sciences, Chonnam National University, Gwangju 61186, South Korea
4Korea Atomic Energy Research Institute, Daejeon 34057, South Korea

Correspondence to : seungsep@cnu.ac.kr

Received: August 14, 2017; Revised: December 27, 2017; Accepted: December 28, 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided original work is properly cited.

Abstract

A granite rock body, called ‘Bukbawi’, located on a mountaineering trail at Mt. Palgong Provincial Park is popular among the public because it resembles a percussion instrument. If someone hits the specific surface area of this rock body, people can hear drum-like sound. Such phenomenon may be geologically associated with exfoliation process of the granite body or miarolitic cavity developed after gasses escaped during formation of granite. To understand better the inner structure causing drum-like sound, we carried out a non-destructive ground-penetrating radar survey. In this study, as our primary target is very close to the surface, we utilized 1 GHz antennas to produce high-resolution near-surface images. In order to construct 3-D internal images, the measurements were conducted along a pre-defined grid. The processed radargrams revealed that the locations associated with ‘drum’ sound coincide with strong reflections. In addition, both reflection patterns of fracture and cavity were observed. To further quantify the observed reflections, we simulated GPR scans from a synthetic fracture in a granite body, filled with different materials. The simulated results suggest that both exfoliation process and miarolitic cavity may have contributed to the ‘drum’ phenomena. Furthermore, the radargrams showed a well-developed cavity signature where two major reflection planes were crossed. Thus, our study is an example of non-destructive geophysical studies that can promote Earth Science in the broader community by examining geological structures attracting the public.

Keywords Bukbawi, Mt. Palgong Provincial Park, ground-penetrating radar, non-destructive geophysical survey, internal structure imaging

지하투과레이더를 활용한 팔공산 도립공원 북바위 내부구조 연구

김형기1 ·백승호1 ·김승섭1,2* ·이나영3 ·권장순4

1충남대학교 우주·지질학과, 2충남대학교 지질환경과학과, 3전남대학교 지구환경과학부, 4한국원자력연구원

요 약

Article

Original Article

Econ. Environ. Geol. 2017; 50(6): 487-495

Published online December 31, 2017 https://doi.org/10.9719/EEG.2017.50.6.487

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Imaging Inner Structure of Bukbawi at Mt. Palgong Provincial Park Using Ground Penetrating Radar

Hyeong-Gi Kim1, Seung-Ho Baek1, Seung-Sep Kim1,2*, Na Young Lee3 and Jang-Soon Kwon4

1Department of Astronomy, Space Science and Geology, Chungnam National University, Daejeon 34134, South Korea
2Department of Geology and Earth Environmental Sciences, Chungnam National University, Daejeon 34134, South Korea
3Faculty of Earth Systems and Environmental Sciences, Chonnam National University, Gwangju 61186, South Korea
4Korea Atomic Energy Research Institute, Daejeon 34057, South Korea

Correspondence to:seungsep@cnu.ac.kr

Received: August 14, 2017; Revised: December 27, 2017; Accepted: December 28, 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided original work is properly cited.

Abstract

A granite rock body, called ‘Bukbawi’, located on a mountaineering trail at Mt. Palgong Provincial Park is popular among the public because it resembles a percussion instrument. If someone hits the specific surface area of this rock body, people can hear drum-like sound. Such phenomenon may be geologically associated with exfoliation process of the granite body or miarolitic cavity developed after gasses escaped during formation of granite. To understand better the inner structure causing drum-like sound, we carried out a non-destructive ground-penetrating radar survey. In this study, as our primary target is very close to the surface, we utilized 1 GHz antennas to produce high-resolution near-surface images. In order to construct 3-D internal images, the measurements were conducted along a pre-defined grid. The processed radargrams revealed that the locations associated with ‘drum’ sound coincide with strong reflections. In addition, both reflection patterns of fracture and cavity were observed. To further quantify the observed reflections, we simulated GPR scans from a synthetic fracture in a granite body, filled with different materials. The simulated results suggest that both exfoliation process and miarolitic cavity may have contributed to the ‘drum’ phenomena. Furthermore, the radargrams showed a well-developed cavity signature where two major reflection planes were crossed. Thus, our study is an example of non-destructive geophysical studies that can promote Earth Science in the broader community by examining geological structures attracting the public.

Keywords Bukbawi, Mt. Palgong Provincial Park, ground-penetrating radar, non-destructive geophysical survey, internal structure imaging

지하투과레이더를 활용한 팔공산 도립공원 북바위 내부구조 연구

김형기1 ·백승호1 ·김승섭1,2* ·이나영3 ·권장순4

1충남대학교 우주·지질학과, 2충남대학교 지질환경과학과, 3전남대학교 지구환경과학부, 4한국원자력연구원

Received: August 14, 2017; Revised: December 27, 2017; Accepted: December 28, 2017

요 약

    KSEEG
    Apr 30, 2024 Vol.57 No.2, pp. 107~280

    Stats or Metrics

    Share this article on

    • kakao talk
    • line

    Related articles in KSEEG

    Economic and Environmental Geology

    pISSN 1225-7281
    eISSN 2288-7962
    qr-code Download