한국지구과학회지 (Journal of the Korean earth science society)

  • 제41권6호
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  • Pages.658-669
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  • 2020
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  • 1225-6692(pISSN)
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  • 2287-4518(eISSN)
한국지구과학회 (The Korean Earth Science Society)
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기상변화와 지진계 설치 깊이가 HVSR 분석결과에 미치는 영향

Effects of Meteorological Variations and Sensor Burial Depths on HVSR Analysis

  • 강수영 (부산대학교 지질재해산업자원연구소) ;
  • 김광희 (부산대학교 지질환경과학과) ;
  • 김도영 (부산대학교 지질재해산업자원연구소) ;
  • 전병욱 (부산대학교 지질재해산업자원연구소) ;
  • 이진욱 (부산대학교 지질재해산업자원연구소)
  • Kang, Su Young (Institute of Geologic Hazard & Industrial Resources, Pusan National University) ;
  • Kim, Kwang-Hee (Department of Geological Science, Pusan National University) ;
  • Kim, Doyoung (Institute of Geologic Hazard & Industrial Resources, Pusan National University) ;
  • Jeon, Byeong-Uk (Institute of Geologic Hazard & Industrial Resources, Pusan National University) ;
  • Lee, Jin-Wook (Institute of Geologic Hazard & Industrial Resources, Pusan National University)
  • 투고 : 2020.10.15
  • 심사 : 2020.12.18
  • 발행 : 2020.12.31
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초록

지반증폭특성과 퇴적층 두께를 분석할 때 배경잡음을 이용한 HVSR 방법을 적용할 수 있다. 본 연구는 배경잡음을 관측할 때 풍속과 강수량의 변화가 HVSR 분석 결과에 미치는 영향을 비교 분석하였다. 지진계는 매설 깊이를 다르게 하여 포항기상대에 설치하였다. 지진계가 지표에 노출된 상태에서 배경잡음을 관측하고 분석하면 부정확한 HVSR 결과가 도출된다. 바람이 강하게 부는 상황에서 관측한 배경잡음 또한 부정확한 HVSR 결과를 도출한다. 바람의 세기 3 ms-1 이하에서 배경잡음을 관측하여 분석하는 것이 적절하다. 지진계를 매설하면 강수량 변화에 상관없이 안정적인 HVSR 분석 결과를 도출하였다. 본 연구는 배경잡음 관측 시 지진계의 매설 깊이와 날씨의 영향을 최소화할 수 있는 설치환경과 관측환경을 제시함으로써 HVSR 분석 결과의 신뢰성과 정확성 향상을 도모한다.

The horizontal-to-vertical spectral ratio (HVSR) analysis is conducted to estimate the site amplification effect and the thickness of the sedimentary layer beneath the measurement site. We investigated the effects of meteorological variations (wind and precipitation rate) and sensor burial depths on HVSR analysis. The HVSR results were unstable when seismographs were exposed on the ground. The HVSR results of ambient noise data measured under strong winds were also unstable. It is recommended to measure the ambient noise at wind speeds of <3 m s-1. Stable HVSR results were obtained when seismographs were buried, regardless of the precipitation rates. The results of this study provide the best observations and optimal weather conditions required to acquire accurate and reliable HVSR results.

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