대한공간정보학회지 (Journal of Korean Society for Geospatial Information Science)

  • 제23권1호
  • /
  • Pages.47-54
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  • 2015
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  • 1598-2955(pISSN)
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  • 2287-6693(eISSN)
대한공간정보학회 (Korea Spatial Information Society)
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지진에 의한 측지학적 지각변동 분석을 위한 GNSS 자료 전처리 연구

A Study on GNSS Data Pre-processing for Analyzing Geodetic Effects on Crustal Deformation due to the Earthquake

  • 손동효 (인하대학교 공간정보공학과) ;
  • 김두식 (인하대학교 공간정보공학과) ;
  • 박관동 (인하대학교 공간정보공학과)
  • Sohn, Dong Hyo (Department of Geoinformatic Engineering, Inha University) ;
  • Kim, Du Sik (Department of Geoinformatic Engineering, Inha University) ;
  • Park, Kwan Dong (Department of Geoinformatic Engineering, Inha University)
  • 투고 : 2015.01.26
  • 심사 : 2015.03.09
  • 발행 : 2015.03.31
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초록

이 논문에서는 지진에 의한 지각변동 분석에서 측지학적 요소만을 구분하고자 하는 목적으로 GNSS 자료를 전처리하는 전략을 연구하였다. 이를 위해 GNSS 자료처리 결과의 해석에 앞서 GNSS 좌표 시계열에서 나타나는 위신호들을 검출하고 제거하였다. GNSS 관측소는 한반도가 포함된 큰 지각판 위에 위치하므로 판의 운동으로 인한 속도가 좌표 시계열에 포함된다. 그리고 일부 관측소 주변에 위치한 나무들은 계절에 따라 성장변화가 일어나기 때문에 계절적 신호특성이 GNSS 좌표 시계열에 반영된다. 따라서 오일러축에 의한 지각판 운동효과를 정확히 제거하기 위해 축의 위치와 각속도를 한반도 지각판에 맞게 새롭게 추정하였고 이에 대한 검증을 수행하였다. 그리고 1년 주기로 나타나는 계절변동 신호를 추정해 각 관측소의 좌표시계열에 반영하였다. 두 효과를 제거함으로써 지진에 의한 영향을 측지학적으로 분석할 수 있다. 이를 이용해 2011년 동일본 대지진에 의한 지각변위 예비 분석을 수행하였다.

In this study, we developed strategies for pre-processing GNSS data for the purpose of separating geodetic factors from crustal deformation due to the earthquakes. Before interpreting GNSS data analysis results, we removed false signals from GNSS coordinate time series. Because permanent GNSS stations are located on a large tectonic plate, GNSS position estimates should be affected by the tectonic velocity of the plate. Also, stations with surrounding trees have seasonal signals in their three-dimensional coordinate estimates. Thus, we have estimated the location of an Euler pole and angular velocities to deduce the plate tectonic velocity and verified with geological models. Also, annual amplitudes and initial phases were estimated to get rid of those false annual signals showing up in the time series. By considering the two effects, truly geodetic analysis was possible and the result was used as preliminary data for analyzing post-seismic deformation of the Korean peninsula due to the Tohoku-oki earthquake.

키워드

참고문헌

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