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지형효과를 이용한 한반도에서 관측된 2011년 동일본 지진해일 선행파 수치모의

Numerical Simulations of the 2011 Tohoku, Japan Tsunami Forerunner Observed in Korea using the Bathymetry Effect

박은희|이종호|박순천|이덕기|이준환
한국해안,해양공학회|2016.10|한국해안·해양공학회논문집 (Journal of Korean Society of Coastal and Ocean Engineers)|제28권 제5호|pp. 265-276

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지진해일 선행파지형효과2011 동일본 지진해일조위관측소도달시각tsunami forerunnerbathymetry effect2011 TohokuJapan tsunamitide stationarrival time
주제분류토목공학

초록

2011년 3월 11일에 발생한 2011년 동일본(도호쿠) 지진해일은 한반도에 도달하여 많은 조위관측소에 기록되었다. 북동쪽 조위관측소 관측 자료에서 기존의 수치모의로 예측한 지진해일 도달시각보다 매우 이른 시간에 지진해일이 관측되는 지진해일 선행파가 관측되었다. Murotani et al.(2015)는 지형효과가 일본 및 러시아에서 관측된지진해일 선행파와 관련 있음을 밝혔다. 본 연구에서는 지형효과를 고려한 지진해일 수치모의를 통해 우리나라에서관측된 지진해일 선행파를 재현하였다. 이를 통하여 2011년 동일본 대지진과 같이 완만한 경사의 단층에서 발생한지진에 의한 지진해일의 경우 지형효과를 고려하는 것이 지진해일 예측에 중요함을 알 수 있었다. 그러나 수치모의에 지형효과를 고려하기 위해서는 추가적인 연산 시간이 소요되므로 지진해일 통보 시스템에 적용하기 위해서는충분한 검토가 필요하다.

Abstract

The 2011 Tohoku, Japan Tsunami, which occurred on March 11, 2011, reached the Korean Peninsula and was recorded at numerous tide stations. In the records of the north-eastern tide stations, tsunami forerunners were found in only about a few minutes after the earthquake, which was much earlier than the expected arrival time based on a numerical simulation. Murotani et al. (2015) found out that the bathymetry effect is related to the tsunami forerunners observed in Japan and Russia. In this study, the tsunami forerunners observed in Korea were well reproduced by a numerical simulation considering the bathymetry effect. This indicates that it is important to consider the bathymetry effect for a tsunami caused by an earthquake on shallowly dipping fault plane(e.g. 2011 Tohoku, Japan Earthquake). However, since the bathymetry effect requires additional computation time, it is necessary to examine the problems that results from applying the bathymetry effect to the tsunami warning system.

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