Journal of the Geological Society of Korea (지질학회지)

The Geological Society of Korea (대한지질학회)
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Paleostress changes based on analysis of geological structures around the Byeonsan peninsula area

변산반도 일원의 지질구조 분석을 통해 도출된 고응력장 변화

  • 고경태 (한국지질자원연구원 국토지질연구본부) ;
  • 최진혁 (파리 지구물리연구소) ;
  • ;
  • 김영석 (부경대학교 지구환경과학과)
  • Received : 2015.01.16
  • Accepted : 2015.03.14
  • Published : 2015.04.30
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Abstract

Paleostress analysis is carried out based on various structural elements and their characteristics around the Byeonsan peninsula, western Korea. In a regional-scale lineament analysis, the NE-SW trending set is dominant in land but NNW-SSE or NW-SE trending sets are obviously recognized along coastal line and in islands. Filed observations show that two different fault sets (NW-SE trending left-lateral, and E-W trending normal faults) are formed under a stress regime which is represented by E-W trending compression stress regime (Event-1). Other two fault sets (NNW-SSE trending normal and WNW-ESE trending right-lateral faults) are assumed as a result of NNW-SSW trending compression stress regime (Event-2). One interesting result is that fault reactivation with left-lateral slip sense is also observed along the NW-SE and NNW-SSE trending faults. This may be a result of the present stress regime which is estimated as ENE-WSW trending compression stress regime (Event-3). Therefore, our study imply that the study area underwent at least three different tectonic events, and the last event has occurred in the present tectonic regime.

변산반도 일원의 해안가 및 인근 도서지역에 나타나는 다양한 지질구조들의 발달특성을 조사하여 연구지역의 고응력장 변화를 밝히고자 하였다. 먼저 선형구조 분석결과, 내륙지역에서는 북동-남서 방향이 우세하지만, 해안 및 인근 도서지역에서는 북북서-남남동 내지 북서-남동 방향의 선형구조가 비교적 뚜렷하고 명확하게 인지되었다. 야외조사를 통해 북서-남동 방향의 좌수향 주향이동단층 그리고 동-서 방향의 정단층은 동-서 방향의 압축력 조건하에서 생성된 것으로 여겨진다(Event 1). 또한 북북서-남남동 방향의 정단층 및 서북서-동남동 방향의 우수향 주향이동단층은 북북서-남남동 방향 압축력으로의 응력 변화를 지시해준다(Event 2). 그리고 북서-남동 내지 북북서-남남동 방향의 단층들은 일부 지점에서 좌수향 주향이동으로의 재활성 단층운동이 인지되었으며, 이는 현재 한반도에 작용하는 동북동-서남서 방향의 일반적인 압축력과 일치한다(Event 3). 이러한 부안지역 취성지질구조요소들의 분석을 통한 고응력장 해석에서 이 지역은 최소 3회의 응력변화를 겪었던 것으로 해석되며, 최후기의 구조운동은 현재의 응력장하에서 발생했던 것으로 해석된다.

Keywords

Acknowledgement

Grant : 서해 연안지질 위험 요소 연구

Supported by : 한국지질자원연구원

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