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NTIS 바로가기한국지진공학회논문집 = Journal of the Earthquake Engineering Society of Korea, v.20 no.7 special, 2016년, pp.443 - 451
강현구 (서울대학교 건축학과) , 정승용 (서울대학교 건축학과) , 김상희 (서울대학교 건축학과) , 홍성원 (서울대학교 공학연구원) , 최병정 (경기대학교 플랜트.건축공학과)
A Gyeongju earthquake in the magnitude of 5.8 on the Richter scale (the moment magnitude of 5.4), which was recorded as the strongest earthquake in Korea, occurred in September 12, 2016. Compared with the 2011 Virginia earthquake, the moment magnitude was slightly smaller and its duration was 3 seco...
핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
기상청에서는 지진의 규모를 어떻게 산정하고 있는가? | 이렇게 기관에 따라 규모가 다른 것은 규모의 산정식이 다르며, 사용한 관측 데이터가 다르기 때문이다. 기상청에서는 리히터(지역) 규모식을 기반으로 하여 미국 서부 캘리포니아에서 사용하는 감쇠식을 수정하여 규모를 산정하고 있다(식 (1))[3]. | |
지진 모멘트는 어떻게 구하는가? | 여기서 M0는 지진 모멘트(seismic moment)이며, 단층의 전단계수, 단층의 붕괴 면적, 단층의 어긋난 길이의 곱으로 구한다. 단위는 dyne·cm (10-7N·m)이다. | |
강진에 대해서 리히터 규모가 아닌 모멘트 규모를 사용하는 이유는? | 단위는 dyne·cm (10-7N·m)이다. 리히터 규모는 지진파의 진폭과 거리에 따른 감쇠식으로 산정되고, 진앙으로부터 600 km 이내에서만 유효하며, 강진에 대한 규모 산정이 부정확하다는 한계가 있다. 따라서 최근에는 강진에 대해서는 모멘트 규모를 많이 사용하고 있다. |
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