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NTIS 바로가기대한원격탐사학회지 = Korean journal of remote sensing, v.34 no.6 pt.4, 2018년, pp.1531 - 1544
손동효 (기상청 지진화산국 지진화산연구과) , 박순천 (기상청 지진화산국 지진화산연구과) , 이원진 (기상청 지진화산국 지진화산연구과) , 이덕기 (기상청 지진화산국 지진화산연구과)
We detected the coseismic ionospheric disturbance generated by the earthquakes of magnitude 5.0 and greater in Korean Peninsula. We considered the seismic events such as Gyeongju earthquake in September 2016 with magnitude 5.8, the Pohang earthquake in November 2017 with magnitude 5.4, and the under...
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핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
전리층의 전자밀도는 어떻게 변하는가? | 이들의 영향으로 발생하는 지연오차는 위성의 위치나 관측시간에 따라 수 미터에서 수 십 미터까지 발생한다. 전리층의 전자밀도는 태양의 일주운동(밤과 낮의 변화), 계절변화, 흑점폭발로 인해 일정한 주기로 변하지만(Emardsonet al., 2013; Misra and Enge, 2012), 태양플레어 폭발, 코로나 물질방출, 지자기폭풍 등과 같이 비주기적으로 나타나는 현상으로 인해 단기간에 급격히 변하는 경우도 있다(Mitchell et al., 2005; Pokhotelov et al., 2010). | |
전리층 변동연구는 어떻게 진행되어 왔는가? | 그 원인에 대해 국내 지진과 같이 규모가 작은 지진에 동반되는 지표의 수직변위나 음파 에너지가 크지 않고, 발생하는 지진의 많은 경우가 주향이동단층의 특성을 가져 지진의 규모와 발생 특성이 전리층 변동에 큰 영향을 미치지 않았다고 해석하였다. 이와 같이 지구 내부 요인으로 인해 발생한 전리층 변동연구는 수 많은 사례를 통해 다양하게 진행되어 왔으며, 주로 규모 6.0 이상의 대형지진을 대상으로 전리층 변동연구뿐만 아니라 연계된 분석이 다양하게 수행되었다. 일부 연구에서 규모 5. | |
6.0 이상의 대형지진에 전리층 변화가 일어난다고 보이는데, 이에 반하는 예는 무엇인가? | 5로 보고한 바 있다. 그러나 Tojiev et al.(2013)는우즈베키스탄에서 발생한 규모 5.0 이상의 지진을 대상으로 전리층 변동이 탐지되었음을 보고하였고, 진앙과 충분히 가까운 관측소에서는 규모 5.0 미만의 지진에 의해서도 전리층 변동이 탐지될 가능성이 있음을 제시하였다. Karia and Pathak(2011)은 2009년 인도에서 발생한 규모 5.0 수준의 지진들로 인해 총전자수가 증가하였음을 확인하였다. 그리고 Park et al.(2011)과 Zhang and Tang(2015)은 2009년 5월에 발생한 규모 4.5의 북한 핵실험으로 인해 전리층 변동이 발생함을 보였다. |
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