Journal of the Korean Association of Geographic Information Studies (한국지리정보학회지)

The Korean Association of Geographic Information Studies (한국지리정보학회)
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Seismic Displacement Analysis of GPS Permanent Stations in Korean and Asian Area Due to the Tohoku-Oki Mega-Thrust Earthquake

일본 Tohoku-Oki 대지진으로 인한 한국 및 아시아 지역 상시관측소의 위치변동량 분석

  • Hwang, Jin-Sang (Department of Architectural and Environmental System Engineering, SungKyunKwan University) ;
  • Yun, Hong-Sic (Department of Civil and Environmental Engineering, SungKyunKwan University) ;
  • Lee, Dong-Ha (Department of Architectural and Environmental System Engineering, SungKyunKwan University) ;
  • Jung, Tae-Jun (Department of Architectural and Environmental System Engineering, SungKyunKwan University) ;
  • Suh, Yong-Cheol (Department of Spatial Information Engineering, Pukyong National University)
  • 황진상 (성균관대학교 건설환경시스템공학과) ;
  • 윤홍식 (성균관대학교 사회환경시스템공학과) ;
  • 이동하 (성균관대학교 건설환경시스템공학과) ;
  • 정태준 (성균관대학교 건설환경시스템공학과) ;
  • 서용철 (부경대학교 공간정보시스템공학과)
  • Received : 2011.10.11
  • Accepted : 2011.12.13
  • Published : 2011.12.30
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Abstract

In this study, we analyzed the effects of seismic displacements due to the mega thrust earthquake occurred near Tohoku-Oki area on Mar. 11, 2011 with Mw 9.0 magnitude in the context of evaluation of position change by the earthquake on the Korean and Asian GPS permanent stations. For this, two weeks GPS data observed around the event of Tohoku-Oki earthquake (Mar. 4 ~ Mar. 18, 2011) were obtained from 22 GPS permanent stations in the vicinity of epicenter (Korea, Japan, Russia, China and Taiwan) and 284 IGS global stations. All available GPS data were processed and adjusted by GAMIT/GLOBK software to estimate the co-seismic horizontal displacements at each station. As the results of GPS analysis, the co-seismic displacements due to Tohoku-Oki earthquake were clearly revealed in the GPS stations of Asian region, Japan and its neighboring countries, and even to affect the horizontal position of GPS station (WUHN in China) which are located about 2,702km away from the epicenter. In conclusion, it was found that the Tohoku-Oki earthquake had resulted in the horizontal displacements ranging from 14.9 mm to 58.3 mm in Korea. So, these displacements can cause the position error of GPS geodetic survey up to 20 mm without updating the coordinates of Korean geodetic network.

284개의 IGS GPS 관측소와 한반도 및 인근 섬들에 위치한 22개 GPS 관측소의 관측 데이터를 이용하여 2011년 3월 11일에 발생한 진도 9.0Mw의 Tohoku-Oki 지진이 아시아 및 한국의 GPS 상시관측소에 미친 위치변동량을 분석하였다. GPS 관측데이터는 지진발생일을 기준으로 전후 7일씩 총 15일간 수신자료를 이용하였으며, GAMIT/GLOBK 소프트웨어를 이용하여 등진역 변위와 지진 후 변위를 해석하였다. 연구 결과, Tohoku-Oki 지진의 영향이 광범위 하여 진앙 중심으로부터 2,702km 떨어진 GPS 상시관측소에서도 등진역 변위가 발생한 것으로 나타났으며, 일본과 가까운 한국, 중국, 대만, 러시아 등 여러 국가에서도 지진의 영향이 확인되었다. 또한, Tohoku-Oki 지진은 한국의 GPS 상시관측소에 최소 14.9mm에서 최대 58.3mm에 이르는 위치변동량을 발생시켜 측지기준망의 성과를 새롭게 정비하지 않고 GPS 측량을 수행하는 경우 최대 20mm에 이르는 위치오차가 발생할 수 있을 것으로 판단되었다.

Keywords

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