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

The Korean Association of Geographic Information Studies (한국지리정보학회)
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A Study for Monitoring Soil Liquefaction Occurred by Earthquakes Using Soil Moisture Indices Derived from the Multi-temporal Landsat Satellite Imagery Acquired in Pohang, South Korea

다중시기 Landsat 위성영상으로부터 산출한 토양 수분 지수를 활용하여 지진 발생으로 인한 토양 액상화 모니터링에 관한 연구: 포항시를 사례로

  • 박인선 ((주)지오씨엔아이 공간정보기술연구소) ;
  • 김경섭 ((주)지오씨엔아이 공간정보기술연구소) ;
  • 한병철 ((주)지오씨엔아이 공간정보기술연구소) ;
  • 정윤재 ((주)지오씨엔아이 공간정보기술연구소) ;
  • 구본엽 ((주)지오씨엔아이 공간정보기술연구소) ;
  • 한진태 (한국건설기술연구원 인프라안전연구본부 지진안전연구센터) ;
  • 김종관 (한국건설기술연구원 인프라안전연구본부 지진안전연구센터)
  • Received : 2021.03.09
  • Accepted : 2021.03.18
  • Published : 2021.03.31
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Abstract

Recently, the number of damages on social infrastructure has increased due to natural disasters and the frequency of earthquake events that are higher than magnitude 3 has increased in South Korea. Liquefaction was found near the epicenter of a 5.4 magnitude earthquake that occurred in Pohang, South Korea, in 2017. To explore increases in soil moisture index due to soil liquefaction, changes in the remote exploration index by the land cover before and post-earthquake occurrence were analyzed using liquefaction feasibility index and multi-cyclical Landsat-8 satellite images. We found that the soil moisture index(SMI) in the liquefaction region immediately after the earthquake event increased significantly using the Normal Vegetation Index(NDVI) and Surface Temperature(LST).

최근 자연재해로 인한 많은 피해가 발생하고 있으며, 특히 국내 지진 발생 추이를 보면 규모 3이상의 강도 높은 지진이 발생하는 빈도가 증가하고 있다. 2017년 발생한 규모 5.4의 포항 지진에서는 이례적으로 진앙지 인근에서 액상화 현상이 발견되었다. 토양 액상화에 따른 토양 수분지수의 증가를 간접적으로 파악하기 위해서 액상화가능성지수 자료와 다중시기 Landsat-8 위성영상을 활용하여 지진 전후의 토지피복별 원격탐사지수 변화를 분석하였다. 해당 기간의 위성영상을 취득해 정규식생지수(NDVI)와 지표면온도(LST)를 계산하고 액상화 가능 지역에 대해 토양수분지수(SMI)를 산출하여 각 영상을 구성하고 있는 픽셀의 평균값을 분석한 결과 지진 직후 토양 액상화 현상에 따른 토양 수분지수의 증가를 확인할 수 있었다.

Keywords

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