Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Analysis of Fault Plane Solution and Stress Field Using the Micro-ewarthquakes in the Central Region of South Korea

남한 중부지역에서 발생한 미소지진의 단층면해와 응력장 해석

  • Cheong, Tae-Woong (Department of Earth Science, Sejong University) ;
  • Lee, Jae-Gu (Department of Earth Science Education, Korea National University of Education) ;
  • Lee, Duk-Kee (METRI/KMA Marine Meteorology and Earthquake Research Lab.) ;
  • Lee, Eun-Ah (Department of Earth Science Education, Korea National University of Education) ;
  • Kyung, Jai-Bok (Department of Earth Science Education, Korea National University of Education)
  • 정태웅 (세종대학교 지구과학교육과) ;
  • 이재구 (한국교원대학교 지구과학교육과) ;
  • 이덕기 (기상청 기상연구소 해양기상지진실) ;
  • 이은아 (한국교원대학교 지구과학교육과) ;
  • 경재복 (한국교원대학교 지구과학교육과)
  • Published : 2001.08.31
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Abstract

By using two methods we obtained plane solutions for 5 groups of earthquakes including 13 events, which occurred in the central region of South Korea after December 1997. The first method is the composite fault plane solution by P wave polarity, and the second the solution by amplitude ratio (SV/P, SH/P, SV/SH) and P and S wave polarities. The two method results show similar results. The strike of fault is in the direction of NNE-SSW and WNW-ESE with the movement of strike-slip or strike-slip including thrust component. The compressional axis of the stress field dominantly trends ENE-WSW or NE-SW. The results are almost consistent with the other main events occurred in and around the Korean Peninsula.

1997년 12월 이후 남한 중부지역에서 방생한 지진 중 13개 지진에 대하여, 지역에 따라 5개 그룹으로 구분하여 P 파 극성을 이용하여 구한 복합단층면해와 P, S파 극성 및 진폭비(SV/P, SH/P, SV/SH)를 이용하여 구한 결과를 비교 해석하였다. 지진원에서의 단층운동은 NNE-SSW와 WNW-ESE 방향의 단층면을 나타내며 주향이동 혹은 역단층성 주향이동운동이 우세하게 나타났다. 단층운동에 작용한 주압축응력방향은 ENE-WSW 방향, 혹은 NE-SW 방향을 나타내며, 이는 남한지역에 발생하는 주요 지진에 대하여 구해진 주압축 응력장 방향과 거의 일치한다.

Keywords

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