지질공학 (The Journal of Engineering Geology)

  • 제23권3호
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  • Pages.217-225
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  • 2013
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  • 1226-5268(pISSN)
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  • 2287-7169(eISSN)
대한지질공학회 (The Korean Society of Engineering Geology)
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현생 응력하에서 단층 마찰계수에 따른 임곡단층의 거동 가능성 해석

Friction-dependent Slip Behavior of Imgok Fault under the Present-day Stress Field

  • 나현우 (충남대학교 지질환경과학과) ;
  • 장찬동 (충남대학교 지질환경과학과) ;
  • 장천중 (한국수력원자력(주) 중앙연구원)
  • Na, Hyun-Woo (Geology and Earth Environmental Sciences, Chungnam National University) ;
  • Chang, Chandong (Geology and Earth Environmental Sciences, Chungnam National University) ;
  • Chang, Chun-Joong (Central Research Institute, Korea Hydro & Nuclear Power)
  • 투고 : 2013.07.11
  • 심사 : 2013.09.04
  • 발행 : 2013.09.30
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초록

강릉지역의 NNE-SSW 주향을 갖는 선형구조(임곡단층)를 대상으로, ASTER 영상과 항공사진을 이용한 구조 영상 분석과 야외지질조사를 통해 단층의 기하 및 운동학적 특성을 관찰하고 단층의 지질역학적 특성에 대한 분석을 시도하였다. 현생 응력장 하에서 임곡단층의 운동 가능성 여부를 파악하기 위해 이용된 주변 지진자료는 이 지역의 현생 최대응력방향이 약 N$70^{\circ}$E이며 주향이동과 역단층 운동에 유리한 응력상태임을 보여준다. 현생 응력장 하에서 임곡단층이 운동하기에는 최적의 방향에서 오차 범위 밖의 주향을 보여 전단 성향이 낮은 것으로 분석되었다. 그러나 단층의 역학적 특성을 나타내는 마찰계수(${\mu}$)가 상당히 낮을 경우(예를 들어 0.25 이하) 현생 응력장 하에서도 운동 가능성이 있는 것으로 파악된다.

We carried out geometrical, kinematic, and geomechanical analyses on a lineament (the Imgok fault) near Gangneung, observed in ASTER images and aerial photographs, and field surveys. Earthquake focal mechanism solutions, used to estimate the present-day stress state, revealed that the direction of maximum compression is approximately N$70^{\circ}$E and that the stress condition is in favor of either strike-slip or reverse movement on the fault. The strike of the fault is not ideal for slip under the present-day stress field and thus the fault has a low slip tendency. However, the fault may be able to slip if the frictional coefficient (${\mu}$), representing the resistance of the fault to slip, is sufficiently low (e.g., ${\mu}$ < 0.25).

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