Geophysics and Geophysical Exploration (지구물리와물리탐사)

Korean Society of Earth and Exploration Geophysicists (한국지구물리·물리탐사학회)
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Surface Wave Method II: Focused on Passive Method

표면파 탐사 II: 수동 탐사법을 중심으로

  • Cho, Sung Oh (National Research Institute of Cultural Heritage) ;
  • Joung, Inseok (Department of Energy & Mineral Resources Engineering, Sejong University) ;
  • Kim, Bitnarae (Department of Energy & Mineral Resources Engineering, Sejong University) ;
  • Jang, Hanna (Department of Energy & Mineral Resources Engineering, Sejong University) ;
  • Jang, Seonghyung (Korea Institute of Geoscience and Mineral Resources) ;
  • Hayashi, Koich (Geometrics) ;
  • Nam, Myung Jin (Department of Energy & Mineral Resources Engineering, Sejong University/Department of Energy Resources and Geosystems Engineering, Sejong University)
  • 조성오 (국립문화재연구원) ;
  • 정인석 (세종대학교 에너지자원공학과) ;
  • 김빛나래 (세종대학교 에너지자원공학과) ;
  • 장한나 (세종대학교 에너지자원공학과) ;
  • 장성형 (한국지질자원연구원) ;
  • ;
  • 남명진 (세종대학교 에너지자원공학과/지구자원시스템공학과)
  • Received : 2022.01.04
  • Accepted : 2022.02.24
  • Published : 2022.02.28
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Abstract

The passive surface wave method measures seismic signals from ambient noises or vibrations of natural phenomena without using an artificial source. Since passive sources are usually in lower frequencies than artificial ones being able to ensure the information on deeper geological structures, the passive surface wave method can investigate deeper geological structures. In the passive method, frequency dispersion curves are obtained after data acquisition, and the dispersion curves are analyzed by assuming 1D-layered earth, which is like the method of active surface wave survey. However, when computing dispersion curves, the passive method first obtains and analyzes coherence curves of received signals from a set of receivers based on spatial autocorrelation. In this review, we explain how passive surface wave methods measure signals, and make data processing and interpretation, before analyzing field application cases.

수동 표면파 탐사는 인공 송신원 없이 생활잡음 또는 자연 발생 소음 등을 송신원으로 이용해 탄성파 신호를 측정한다. 수동 송신원은 낮은 진동수 대역에서 발생하기 때문에 수동 표면파 탐사는 일반적인 능동 탐사법 보다 더 깊은 심도의 지질 정보를 확보할 수 있어 심부 부지 평가 분야에 많이 활용되고 있다. 수동 표면파 탐사 자료는 능동 표면파 탐사 자료 해석과 마찬가지로 자료 획득 후 진동수 분산곡선을 구하여 1차원으로 가정한 속도구조를 해석한다. 하지만 수동 표면파 탐사 자료는 송신원이 무작위로 발생한다는 특성 때문에 여러 수신기에서 측정된 신호들의 공간자기상관을(spatial autocorrelation) 이용해 수신 자료들의 일관성(coherence) 곡선을 구하고 이로부터 분산곡선을 구하게 된다. 이 기술보고에서는 수동 표면파 탐사 이론, 탐사 방법, 자료처리 기법을 살펴보고 실제 적용 사례를 분석한다.

Keywords

Acknowledgement

본 연구는 산업통상자원부의 재원으로 KETEP의 지원(No. 20194010201920)과 원자력안전위원회의 재원으로 사용후핵연료관리핵심기술개발사업단 및 한국원자력안전재단의 지원(No. 2109092-0121-WT112)으로 수행되었으며 이에 깊은 감사를 드립니다.

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