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http://dx.doi.org/10.5000/EESK.2014.18.5.213

The Source Parameters of Offshore Earthquakes with Magnitude Larger than 4.0 Nearby Sinan  

Choi, Hoseon (Department of Structural Systems & Site Safety Evaluation, Korea Institute of Nuclear Safety)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.18, no.5, 2014 , pp. 213-219 More about this Journal
Abstract
The source parameters of four earthquakes with magnitude larger than 4.0 nearby the offshore Sinan are analyzed. The waveform inversion method is used for analyzing the source parameters of two events (20 August 2012 and 21 April 2013) with C&B and AK135-c crustal velocity structure models. The source parameters of the other two events (26 July 1994 and 23 March 2003) are obtained from references. Focal mechanisms of the events are strike slip faulting or strike slip faulting with a thrust component. The directions of P-axes of the events are ENE-WSW or NE-SW which are similar to previous studies on P-axes in and around the Korean peninsula. With regard to the events nearby the offshore Sinan, the regional stress, rather than being local stress, is seen to be the result of the combination of tectonic forces from the compression of plates colliding to the Eurasian Plate.
Keywords
Source parameter; Waveform inversion; Focal mechanism; The offshore Sinan;
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Times Cited By KSCI : 4  (Citation Analysis)
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1 Park Y, Ree JH, Yoo SH. Fault slip analysis of Quaternary faults in southeastern Korea. Gondwana Research. 2006;9:118-125.   DOI   ScienceOn
2 Eguchi T. Tectonic stress field in East Eurasia. Physics of the Earth and Planetary Interiors. 1983;33:318-327.   DOI   ScienceOn
3 Jin S, Park PH. Tectonic activities and deformation in South Korea constrained by GPS observations. International Journal of Geology. 2007;2:11-15.
4 Song DS, Yun HS. Crustal stain pattern analysis of Korean Peninsula using repeated GPS measurements. KSCE Journal of Civil Engineering. 2008;12:267-273.   DOI
5 Asia Economy online newspaper, 2012 Aug 8th, http://www.asiae.co.kr/news/view.htm?idxno=2012082022594077990.
6 Chang SJ, Baag CE. Crustal structure in southern Korea from joint analysis of regional broadband waveforms and travel times. Bulletin of the Seismological Society of America. 2006;96:856-870.   DOI   ScienceOn
7 Kennett BLN, Engdahl ER, Buland R. Constraints on seismic velocities in the earth from travel times. Geophysical Journal International. 1995;122:108-124.   DOI   ScienceOn
8 Cipar JJ. Earthquake focal mechanisms in northeastern China and Korea determined by the grid search algorithm. Environmental Research Papers. 1996;1197:1-25.
9 Choi H, Source parameters of two moderate earthquakes at the Yellow Sea area in the Korean Peninsula on March 22 and 30, 2003. Jigu-Mulli-wa-Mulli-Tamsa. 2010;13:235-242.   과학기술학회마을
10 Kubo A, Fukuyama E, Kawai H, Nomomura K. NIED seismic moment tensor catalogue for regional earthquakes. Tectonophysics. 2002;356:23-48.   DOI
11 Rhie J, Kim S. Regional moment tensor determination in the southern Korean Peninsula. Geosciences Journal. 2010;14:329-333.   DOI
12 Bouchon M. A simple method to calculate green's functions for elastic layered media. Bulletin of the Seismological Society of America. 1981;71:959-971.
13 Sokos EN, Zahradnik J. ISOLA a Fortran code and a Matlab GUI to perform multiple-point source inversion of seismic data. Computers & Geosciences. 2008;34:967-977.   DOI   ScienceOn
14 National Earthquake Comprehensive Information System, http://necis.kma.go.kr/.
15 Kanamori H. The energy release in great earthquakes. Journal of Geophysical Research. 1977;82:2981-2987.   DOI
16 Kim SK, Jun MS, Jeon JS. Recent research for the seismic activities and crustal velocity structure. Journal of Korea Society of Economic and Environmental Geology. 2006;39:369-384.   과학기술학회마을
17 Choi H. Seismic characteristics of earthquakes around the Korean Peninsula and their tectonic implications. Doctoral Thesis. Seoul National University. 2012.
18 Frohlich C. Triangle diagrams: ternary graphs to display similarity and diversity of earthquake focal mechanisms. Physics of the Earth and Planetary Interiors. 1992;75:193-198.   DOI   ScienceOn