The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
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Anisotropy of Magnetic Susceptibility (AMS) of the Quaternary Faults, SE Korea: Application to the Determination of Fault Slip Sense and Paleo-stress Field

한반도 남동부 제4기 단층의 대자율이방성(AMS): 단층의 운동감각과 고응력장 해석

  • Cho, Hyeongseong (Department of Geological Sciences, Pusan National University) ;
  • Kim, Min-Cheol (Department of Geological Sciences, Pusan National University) ;
  • Kim, Hyeonjeong (Department of Geological Sciences, Pusan National University) ;
  • Son, Moon (Department of Geological Sciences, Pusan National University)
  • 조형성 (부산대학교 지질환경과학과) ;
  • 김민철 (부산대학교 지질환경과학과) ;
  • 김현정 (부산대학교 지질환경과학과) ;
  • 손문 (부산대학교 지질환경과학과)
  • Received : 2014.04.24
  • Accepted : 2014.05.12
  • Published : 2014.06.30
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Abstract

The Quaternary faults are extensively observed along major inherited fault zones (i.e. Yangsan Fault System, Ulsan Fault, Yeonil Tectonic Line, Ocheon Fault System) in SE Korea. Their geometry and kinematics provide a very useful piece of information about the Quaternary crustal deformation and stress field in and around Korean Peninsula. Using magnetic fabrics (AMS), we attempted to determine the slip senses of Jinti, Mohwa, Suseongji2, and Wangsan faults and then interpreted the fabric development process of fault gouge and the characteristics of stress field during the Quaternary. All the magnetic fabrics of the faults, except the Wangsan Fault, consistently indicate a dominant reverse-slip sense with weak strike-slip component. Most of the oblate fabrics are nearly parallel to the fault surface and the anisotropy degrees generally increase in proportion to the oblatenesses. These results suggest that the fabrics of the fault gouges resulted from a progressive deformation due to continuous simple shear during the last reactivation stage as reverse faulting. It is also interpreted that the pre-existing fabrics were overwhelmed and obliterated by the re-activated faulting. Paleostress field calculated from the fault slip data indicates an ENE-WNW compressive stress, which is in accord with those determined from previous fault tectonic analysis, focal mechanism solution, and hydraulic fracturing test in and around Korean Peninsula.

한반도 남동부 일원에는 주요 지질구조선(양산단층대, 울산단층, 연일구조선, 오천단층계 등)을 따라 제4기 단층들이 도처에 분포하고 있으며, 이들의 기하와 운동학적 특징은 한반도의 제4기 지각변형사와 현생응력상태 등을 이해하는 데 중요한 정보들을 제공한다. 이번 연구에서는 진티단층, 모화단층, 수성지2단층 그리고 왕산단층을 대상으로 대자율이방성 방법을 적용하여 단층가우지의 미세구조를 분석하고 단층의 운동감각을 해석하였으며, 그 결과를 바탕으로 단층암의 미세구조 발달과정과 제4기 응력장에 대해 논의하였다. 대자율이방성 측정을 통해 구해진 자기미세구조로부터 단층의 운동감각을 분석한 결과, 왕산단층을 제외한 나머지 세 단층은 모두 역이동성이 우세한 단층운동에 의한 미세구조가 발달되어 있다. 단층면에 거의 평행한 편평형의 미세구조가 발달하는 점과 이방성정도가 클수록 편평형의 정도가 증가하는 특징에 근거할 때, 단층가우지의 미세구조는 점진적인 변형에 의한 최종응력변형이 기록된 것으로 해석된다. 또한, 최후기에 재활된 역단층운동으로 기존의 단층가우지 내에 존재하는 미세구조들은 모두 지워지고 최후기의 운동에 의한 미세구조만이 기록된 것으로 판단된다. 단층가우지의 자기미세구조 분석을 통해 유추된 운동감각으로부터 구해진 고응력장은 동북동-서남서 방향의 압축력이며, 이 응력장은 지진원 메커니즘, 수압파쇄시험 그리고 단층 지구조분석결과를 통해 구해진 한반도 남동부의 고응력장과 부합된다. 결론적으로 한반도 일원은 제4기 동안 동-서 내지 동북동-서남서 방향의 압축성 응력장이 지배적이었던 것으로 해석된다.

Keywords

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