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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2021.10
- 수록면
- 589 - 604 (16page)
- DOI
- 10.1007/s12303-020-0053-4
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초록· 키워드
오류제보하기
We study the geomechanical stability of faults in southeastern Korea that have been active during the Quaternary (mostly Pleistocene), to investigate whether these faults can still be considered active today. We compile fault plane data and slip orientations for 40 Quaternary faults in southeastern Korea distributed along the two major fault systems, Yangsan Fault (group 1) and Ulsan Fault (group 2), and in the younger block to the east of the Ulsan Fault (group 3). Our aim is to determine the representative tectonic stress states in the Quaternary and in the present day, and to compare the slip susceptibility of these faults under the stress fields of these two periods. We estimate Quaternary stress from inversion of Quaternary fault data, and present-day stress from inversion of contemporary earthquake mechanisms. Both stress fields exhibit a maximum principal stress axis that is sub-horizontal and trends ENE-WSW, but the intermediate and minimum principal stress axes are switched, suggesting a change in stress regime from reverse-faulting during the Quaternary to strike-slip-faulting in the present day. We demonstrate that this change in stress regime is due to a marked reduction in the magnitude of horizontal tectonic stress from the Quaternary to the present day. We assess the slip susceptibility of the faults under the Quaternary and present-day stress fields using two indices: slip tendency and fault instability. This analysis shows an increase in slip susceptibility for most of group 1 faults and some of group 3 faults. Some of these faults exhibit a slip susceptibility comparable to the average obtained for contemporary earthquake focal planes, suggesting that these faults can be considered active in the present day.
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참고문헌 (66)
참고문헌 신청
Angelier, J. / 2002 / Inversion of earthquake focal mechanisms to obtain the seismotectonic stress IV – a new method free of choice among nodal planes / Geophysical Journal International 150:588~609
Yehuda Ben-Zion / 2008 / Collective behavior of earthquakes and faults: Continuum-discrete transitions, progressive evolutionary changes, and different dynamic regimes / Reviews of Geophysics 46(4):RG4006
Chang, C. / 2010 / Interaction between regional stress state and faults: Complementary analysis of borehole in situ stress and earthquake focal mechanism in southeastern Korea / Tectonophysics 485:164~177
Chang, S.-J. / 2006 / Crustal structure in Southern Korea from joint analysis of regional broadband waveforms and travel times / Bulletin of the Seismological Society of America 96:856~870
Chang, T. W. / 2001 / Quaternary tectonic activity at the Eastern Block of the Ulsan Fault / Journal of the Geological Society of Korea 37:431~444
Yehuda Ben-Zion / 2008 / Collective behavior of earthquakes and faults: Continuum-discrete transitions, progressive evolutionary changes, and different dynamic regimes / Reviews of Geophysics 46(4):RG4006
Chang, C. / 2010 / Interaction between regional stress state and faults: Complementary analysis of borehole in situ stress and earthquake focal mechanism in southeastern Korea / Tectonophysics 485:164~177
Chang, S.-J. / 2006 / Crustal structure in Southern Korea from joint analysis of regional broadband waveforms and travel times / Bulletin of the Seismological Society of America 96:856~870
Chang, T. W. / 2001 / Quaternary tectonic activity at the Eastern Block of the Ulsan Fault / Journal of the Geological Society of Korea 37:431~444
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