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Focal Mechanism Solutions of Microearthquakes in the Southwestern Part of the Korea Peninsula  

Cho, Hee-Kyu (Department of Earth Science Education, Korea National University of Education)
Kang, Tae-Seob (Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources)
Kyung, Jai-Bok (Department of Earth Science Education, Korea National University of Education)
Publication Information
Journal of the Korean earth science society / v.27, no.3, 2006 , pp. 341-347 More about this Journal
Abstract
Focal mechanisms were analyzed for the seven earthquakes which occurred in the southwestern part of the Korea Peninsula from 2001 to 2005. Grid searches are performed to fit distributions of P-wave first-motion polarities and SH/P amplitude ratios for each event. The focal mechanism solutions imply that most of the events have strike-slip sense including partially thrust component. The compressional axes of the solutions are predominantly ENE-WSW or NE-SW indirections. This result is similar to the directions of the principal compressional axes for major earthquakes occurred around the Korea Peninsula.
Keywords
focal mechanism solution; strike-slip fault; stress field;
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1 정태웅, 김우한, 2000, 1997년 6월 26일 경주지진의 단층 면해 비교해석. 지구물리, 3(4), 245-250
2 Snoke, J.A., 2000, FOCMEC: Focal mechanism determination. FOCMEC software manual
3 Hardebeck, J.L. and Shearer, P.M., 2003, Using S/P amplitude ratios to constrain the focal mechanism of small earthquake. Bulletin of the Seismological Society of America, 6, 2434-2444
4 Kang, T.S. and Baag, C.E., 2004, The 29 May 2004, Mw = 5.1, offshore Uljin earthquake, Korea. Geosciences Journal, 8 (2), 115-123   DOI   ScienceOn
5 Lee, K.H., 1979, On the crustal structure of the Korean Peninsula. Journal of the Geological Society of Korea, 15, 253-258
6 김상조, 김소구, 1983, 지진파를 이용한 남한의 지각구조 연구. 광산지질, 16(1), 51-61
7 Jun, M.S., 1990, Source parameters of shallow intraplate earthquake in and around the Korean Peninsula and their tectonic implication. Ph. D. thesis, University of Uppsala, 142 p
8 경재복, 정태웅, 이재구, 이덕기, 이은아, 2001, 남한 중부지역에서 발생한 미소지진의 단층면해와 응력장 해석. 한국지구과학회지, 22(4), 292-300
9 김성균, 1995, 한반도의 지각에 관한 연구. 지질학회지, 31(4), 393-403
10 박창업, 신진수, 지헌철, 강익범, 류용규, 1998, 1996년 12 월 13일 영월지진의 진원단층면 방향. 지구물리, 1(1), 23-30
11 김성균, 정부흥, 1985, 한반도 남부지역의 지각구조. 광산지질, 18, 151-157
12 Snoke, J.A., Munsey, J.W., Teague, A.G., and Bollinger, G.A., 1984, A program for focal mechanism determination by combined use of polarity and SV-P amplitude ratio data. Earthquake Notes, 55, 15
13 이기화, 정태웅, 1999, 1996년 양산단층 일대의 미소지진을 이용한 복합단층면해. 지구물리, 2(4), 235-240
14 Kyung, J.B., Oike, K., and Hori, T., 1996, Temporal variations in seismic and volcanic activity and relationship with stress fields in East Asia. Tectonophysics, 267, 331-342   DOI   ScienceOn