Abstract(일부 발췌) The ROKS Cheonan incident has been investigated by both the Multinational Civilian-Military Joint Investigation Group (Ministry of National Defense, 2010) and Hong (Bull Seism Soc Am 101:1554–1562, 2011). Their respective methods and conclusions are also presented in this study. One of the main differences
between their findings and ours is that we deducted that the fundamental bubble frequency was 1.01 Hzwith a subsequent oscillation of 1.72 Hz. Also, in contrast to findings by the MCMJIG and Hong, our analysis shows the first reverberation frequency to be 8.5 Hz and
the subsequent one to be ≈25 Hz. The TNT-equivalent charge weight (seismic yield) and seismic magnitude were estimated from an observed bubble frequency of 1.01 Hz and the analytical model of a bubble pulse. From the data analyzed, we deducted that the seismic yield would be
about 136 kg of TNT, which is equivalent to the individual yield of a large number of land control mines (LCM) which were abandoned in the vicinity of the ROKS Cheonan incident by the Republic of Korea (ROK) Navy in the 1970s (Ministry of National Defense 2010). Also, whereas both the MCMJIG and HONG estimated the local
magnitude at 1.5, our findings came to the conclusion of a local magnitude of approximately 2.04 based on the bubble frequency of 1.01 Hz measured on the vertical component of BAR station data considering the empirical relationship between charge weight (TNT yield) and underwater explosion magnitude. Strong high-frequency
signals collected at the 3-component BAR station approximately 30 s after P-wave arrivals and infrasound records at BRDAR clearly indicate powerful acoustic phases and N-waves caused by a relatively shallow UWE. T-phases are also observed on seismograms and spectra at 15–17 Hz on the DEI, GAHB, and INCN stations. ■Underwater Explosion (UWE) Analysis of the ROKS Cheonan Incident (So Gu Kim and Yefim
Gitterman)
//www.springerlink.com/content/c861379488372070/ Pure and Applied Geophysics
2012, DOI: 10.1007/s00024-012-0554-9
*온라인게재 2012년 8월 10일 ☞전문을
보신 회원은 의견을 남겨주시길 바랍니다.
덧붙임 : Willis 경험식 및 그림
덧붙임 : 8월20일 추가 그림
※마하효과
※시뮬레이션결과
※지진파 소리음향 재현 시간대 분석 ※이정환 인터뷰 ※버블 최대반경
※Rayleigh-Willis 공식
■Introduction to seismic processing and imaging //www.uio.no/studier/emner/matnat/ifi/INF-GEO4310/h21/undervisningsmateriale/imaging_course.pdf
덧붙임 : 오송전 방지용 접지금구
덧붙임: ICCP의
개념도
출처: 한국군사과학기술학회지
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