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http://dx.doi.org/10.5000/EESK.2009.13.5.023

Source parameters for the December 13 1996 ML 4.5 Earthquake in Yeongwol, South Korea  

Choi, Ho-Seon (한국원자력안전기술원, 서울대학교 지구환경과학부)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.13, no.5, 2009 , pp. 23-29 More about this Journal
Abstract
On December 13, 1996, an earthquake with local magnitude (M$_L$) 4.5 occurred in the Yeongwol area of South Korea. The epicenter was 37.2545$^{\circ}$N and 128.7277$^{\circ}$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$\sim$0.2 Hz filtering bandwidth, focal depth and seismic moment were estimated to be 6 km and 1.3$\times$10$^{16}$ N$\cdot$m, respectively. This seismic moment corresponds to the moment magnitude (M$_W$) 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.
Keywords
Yeongwol; Source parameter; Waveform inversion; Focal mechanism; Spectrum;
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Times Cited By KSCI : 2  (Citation Analysis)
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