Korean Journal of Remote Sensing (대한원격탐사학회지)

Korean Society of Remote Sensing (대한원격탐사학회)
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Preliminary Study of the Tsunami Effect from the Great East Japan Earthquake using the World First Geostationary Ocean Color Imager (GOCI)

천리안 해색위성 GOCI를 이용한 일본 동부 지진해일 영향 연구

  • 손영백 (한국해양연구원 해양위성센터) ;
  • 유주형 (한국해양연구원 해양위성센터)
  • Received : 2012.03.04
  • Accepted : 2012.04.04
  • Published : 2012.04.30
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Abstract

The enormous disaster (Friday nightmare) occurred at 14:46 (JST) (05:46 UTC) on 11 March 2011, officially named "the 2011 Tohoku Earthquake and Tsunami". To monitor the variations of the marine environment after the earthquake, we used chlorophyll and Rrs(555) of GOCI and MODIS ocean color satellite data during March ~ May 2011. Before the earthquake, chlorophyll and Rrs(555) were relatively low around the Sendai areas. After the earthquake;their concentration and intensity were suddenly increased along the coast and the water column was disturbed by the tsunami wave. The severe distortions influenced by the tsunami occurred at less than 30 m water depth and the variations in offshore were difficult to discern the effect of the tsunami. The disturbance by the tsunami was still remained in the terrestrial environment after one month. However the ocean environment returned to the former condition in almost two month later.

2011년 3월 11일 14시 46분 (JST) 일본 센다이에서 동쪽152 km 지점에서 수심 32 km지점에서 ($38.222^{\circ}N$ $142.369^{\circ}E$) 진도 9.0의 대지진이 (공식명칭: The 2011 Tohoku Earthquake and Tsunami) 발생했다. 지진해일 발생 후 센다이를 포함하는 주변해역에서 해양환경의 변화를 모니터링 하기 위해서 해색위성인 GOCI 및 MODIS에서 추출된 클로로필과 Rrs(555)을 이용하여 2011년 3월에서 5월까지 모니터링을 실시 하였다. 지진해일 발생 전 센다이 주변해역 및 일본 동부 해안은 상대적으로 낮은 농도의 클로로필과 부유물질 농도를 보였지만, 지진해일 발생 후 지진해일의 영향은 일본 동부 남북방향의 긴 해안선을 따라서 전 지역에서 영향을 미쳤고, 수층이 교란되었다. 급격한 변화는 수심 30 m 이내의 얕은 수심에서 일어났고, 외해에서의 변화는 거의 없었다. 지진해일 발생 두 달 후 이전의 안정된 해양환경으로 복원된 것으로 관측되었다.

Keywords

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