1996년 12월 13일 ML 4.5 영월 지진의 지진원 상수
Source parameters for the December 13 1996 ML 4.5 Earthquake in Yeongwol, South Korea
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
1996년 12월 13일 강원도 영월군 지역에서 국지규모(ML) 4.5의 지진이 발생하였다. 진앙은 37.2545°N, 128.7277°E이며, 지체구조구상 옥천습곡대에 해당한다. 지진자료의 필터링 대역에 따라 파형역산을 수행하였는데, 0.02∼0.2 Hz 필터링 대역을 적용할 경우 진원 깊이는 6 km, 지진모멘트는 1.3×1016 N⋅m로 추정되었다. 이 지진모멘트는 모멘트규모(MW) 4.7에 해당한다. 파형역산과 P파의 초동 극성 분석을 통한 영월 지진의 발진기구는 역단층 성분을 포함한 주향이동단층 특성을 보이며, 주응력 방향은 동북동-서남서 방향이다. 스펙트럼 분석을 통해 추정된 모멘트규모는 4.8이며, 이는 파형역산에 의해 추정된 모멘트규모와 비슷하다. 평균 응력강하는 14.3 MPa로 추정되었다.
Abstract
On December 13, 1996, an earthquake with local magnitude (ML) 4.5 occurred in the Yeongwol area of South Korea. The epicenter was 37.2545°N and 128.7277°E, which is located inside the Okcheon Fold Belt. The waveform inversion analysis was carried out to estimate source parameters of the event according to the filtering bandwidth of seismic data. Using 0.02∼0.2 Hz filtering bandwidth, focal depth and seismic moment were estimated to be 6 km and 1.3×1016 N⋅m, respectively. This seismic moment corresponds to the moment magnitude (MW) 4.7. The focal mechanism by the waveform inversion and P wave first motion polarity analysis is a strike slip faulting including a small thrust component, and the direction of P-axis is ENE-WSW. The moment magnitude estimated by spectral analysis was 4.8, which is similar to that estimated by waveform inversion. Average stress drop was estimated to be 14.3 MPa.
참고문헌 (17)
- Chang,S.-J., "Crustal structure in southern Korea from joint analysis of regional broadband waveforms and travel times", Bulletin of the Seismological Society of America, 96, pp.856~870 (2006)
- Song,S.-G., "A study on velocity structure of the Korean Peninsula using earthquake data" (2000), Thesis for an M.S. Degree, Seoul National University
- User’s Guide to HYPOINVERSE-2000, a Fortran program to solve for earthquake locations and magnitudes, "Klein,F.W.", U.S.Geological Survey, ~, pp.Open File Report 02-171 (2002)
- 김성균, "한반도 남부에서의 주파수별 가속도 최대진폭의 감쇠", 지질학회지, 38(2), pp.237~250 (2002), 대한지질학회
- Kubo,A., "NIED seismic moment tensor catalogue for regional earthquakes around Japan: quality test and application", Tectonophysics, 356, pp.23~48 (2002)
- Kim,S.G, "Source parameter determination of local earthquakes in Korea using moment tensor inversion of single station data", Bulletin of the Seismological Society of America, 89, pp.1077~1082 (1999)
- Bouchon,M, "A simple method to calculate Green's functions for elastic layered media", Bulletin of the Seismological Society of America, 71, pp.959~971 (1981)
- Sokos,E.N., "ISOLA a Fortran code and a Matlab GUI to perform multiple-point source inversion of seismic data", Computers and Geosciences, 34, pp.967~977 (2008)
- Kim,S.K., "Recent research for the seismic activities and crustal velocity structure", Journal of Korea Society of Economic and Environmental Geology, 39, pp.369~384 (2006)
- Namdae Jo, "The 20 January 2007, Mw 4.48, Odaesan, Korea, earthquake", Geosciences Journal, 11(1), pp.51~58 (2007), 한국지질과학협의회
- Kim, W.-Y, "The 20 January 2007 Odaesan, Korea, Earthquake Sequence", Bulletin of the Seismological Society of America
- Chi, H. C, "Seismological Study on Earthquake Engineering (IV)", Mining & Materials, pp.37~38 (1997), Korea Institute of Geology
- Baag, C.-E, "Fault-plane solutions of the December 13, 1996 Yeongweol earthquake", Journal of the Korean Geophyiscal Society, 1, pp.23~30 (1998)
- Snoke,J.A, "FOCMEC: focal mechanism determinations", International Handbook of Earthquake Engineering Seismology, pp.1629~1630 (2003)
- 노명현, "3성분 지진기록 합성에 의한 퓨리에 진폭스펙트럼 분석", 지구물리, 6(1), pp.25~29 (2003), 대한지구물리학회
- 최호선, "한반도 남부 지역의 지역규모와 모멘트규모의 관계", 지구물리, 7(3), pp.185~192 (2004), 대한지구물리학회
- Ruff,L.J, "State of stress within the Earth,” International Handbook of Earthquake and Engineering Seismology", pp.548~551 (2002), Academic Press