Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Application of Seismic Tomography to the Region in and Near Southern Korean Peninsula

한반도 남부의 지진파 토모그라피 연구

  • Kang, Ik-Bum (Korea Institute of Geoscience and Mineral Resources) ;
  • Park, Jung-Ho (Korea Institute of Geoscience and Mineral Resources)
  • Published : 2006.08.01
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Abstract

3-D seismic tomographic inversion is applied to investigation on velocity structure in and near Korean Peninsula. Firstly, it is applied to the region in southeastern Korean Peninsula. According to the results low-velocity zone seems to be clearly appeared in the so called Gyeongsang sedimentary basin and high-velocity zone is shown at the section of 7.5 km depth it implies the inclusion of plutonic rocks at the sedimentary basin. At the depth about $20{\sim}30$ km existence of low-velocity zone seems to be related with the development of Yangsan fault system. Secondly it is applied to the region not only in Korean Peninsula but also East Sea using data from both Korean Peninsula and Japan Islands. Accorging to the results, subduction zone starting from eastern part of Japan seems to be extended to the region beneath the East Sea.

한반도 남부 및 인근 지역에 대하여 3차원 토모그래피 연구를 수행하였다. 먼저 1차 연구지역은 지진계의 분포가 비교적 조밀하게 설치되어 있는 한반도 남동부지역으로 연구결과에 의하면 경상분지 지역의 지표에서는 퇴적층 지역에서는 상대적으로 저속도가 나타나며 7.5km 깊이에서는 상대적 고속도 분포가 넓게 나타났다. 이는 경상분지 내에서 화성기원의 암석들이 넓게 분포하는 것으로 보인다. 양산단층대 하부 약 $20{\sim}30km$ 깊이에서는 저속도 분포가 나타나는데 이는 양산단층대의 발달과 관계가 있을 것으로 여겨진다. 한반도 및 일본에서 관측된 자료를 이용하여 한반도 및 동해지역의 연구지역에서의 연구결과에 의하면 일본 동부에서 시작된 섭입대는 동해지역에까지 연장되는 것으로 분석되었다.

Keywords

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