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임영빈,고인세 한밭대학교 건설안전기술연구소 2001 건설안전기술논문집 Vol.1 No.-
It is necessary for utilizing the GPS/Leveling method to determine the detailed geoid, and thus many researchers have developed various geopotential models, which are widely used in our community. To obtain the data for this study, 26 GPS observation points including 23 TBL and 3 triangulation points with an approximately 16-㎞ interval were selected from the Andong geographic map with a scale of 1 : 250,000. These data are implemented to the previously developed gravity models : EGM96, OSU91A, and KGEOID. Deviations between geoid calculated from the geopotential models and geoid obtained from GPS observation, based on the assumption that the levels of TBL and triangulation points are correct, are 0.887m∼0.121m in EGM96 model, 0.580m ∼ -0.028m in OSU91A model, and 0.467m ∼ -0.024m in KGEOID model. The average deviations are 0.493m, 0.277m, and 0.195m, respectively and RMS errors are ±0.299m, ±0.152m, and ±0.133m. Although results shows that the KGEOID model has a better accuracy compared to other models, it is though that models used above are still not good for utilizing the GPS/Leveling method. Geoid undulations in the study area are 25.70m on Chungju region in Chungbuk Province and 29.80m on Pohang region in Kyungbuk Province, and deviation isabout 4.10m. The general trend of geoid undulations, however, shows an increasing pattern to the NW-SE direction. It has been also reported that geoid undulations are related with topographic highs and geoid highs, but the low R-squared value (0.01677) calculated in this area suggests that the relationship is very poor. Therefore, it is necessary for the enhancement and establishing the more precise model in appropriate to our countrys terrain to do more geoid related observations, and it is also considered other factors including topography in the field of the detailed geoid studying. Especially, the effect of different materials in the subsurface should be considered and geoid models used in this study would be helpful.
임무택,신영홍,박영수,임형래,고인세,박창석 한국지구물리.물리탐사학회 2019 지구물리와 물리탐사 Vol.22 No.1
한국지질자원연구원에서 2000년부터 2018년까지 수행한 중력 탐사 자료를 처리하여 중력 이상도를 작성하였다. 2016년까지는 전국을 대상으로 하는 중력 이상도 작성에 필요한 자료를 빠르게 획득하기 위하여 약 4 km × 4 km 당 1 점의 측점 밀도로 약 6,400 점에서 측정을 하였다. 이와는 별개로 광산 개발과 관련하여, 관계 화성암 혹은 기반암의 분포를 규명하기 위하여, 2013년에는 제천 NMC 몰랜드 광산의 주변에서, 그리고 2015년에서 2018년까지는 태백산 광화대 일대에서 수백 미터에서 2 km 정도의 간격으로 탐사를 수행하였다. 한편 2016년과 2017년에는 경주와 포항에서 규모가 큰 지진이 발생하였는데, 이들 진앙지 일대에서는 측점 간격이 250 m 정도가 되도록 더욱 정밀하게 탐사를 하였다. 이들까지 포함한 전체 측점은 9,600여 점이다. 한편, 효율적인 탐사를 위하여 일부 지역에 대해서는 부산대학교의 자료를사용하였다. 중복점과 임시 기준점을 제외하면 전체 측점은 약 16,000여 점이며, 이를 바탕으로 순높이 이상, 부게 이상, 지각 평형 이상을 계산하였다. 이 중력 이상도는 우리나라에서 가장 고르게 분포하면서 가장 많은 측점을 사용한 중력이상도로서의 의미를 가진다. We present gravity anomaly maps based on KIGAM’s gravity data measured from 2000 to 2018. Until 2016, we acquired gravity data on about 6,400 points for the purpose of regional mapping covering the whole country with data density of at least one point per 4 km × 4 km for reducing the time of the data acquisition. In addition, we have performed local gravity surveys for the purpose of mining development in and around the NMC Moland Mine at Jecheon in 2013 and in the Taebaeksan mineralized zone from 2015 to 2018 with data interval of several hundred meters to 2 km. Meanwhile, we carried out precise gravity explorations with data interval of about 250 m on and around epicenter areas of Gyeongju and Pohang earthquakes of relatively large magnitude which occurred in 2016 and in 2017, respectively. Thus we acquired in total about 9,600 points data as the result. We also used additional data acquired by Pusan National University for some local areas. Finally, gravity data more than 16,000 points except for the repetition and temporal control points were available to calculate free-air, Bouguer, and isostatic gravity anomalies. Therefore, the presented anomaly maps are most advanced in spatial distribution and the number of used data so far in Korea.

충북 제천 NMC 몰랜드 광산의 관계 화성암에 대한 중력탐사
신영홍,유봉철,임무택,박영수,고인세,Shin, Young Hong,Yoo, Bong Chul,Lim, Mutaek,Park, Yeong-Sue,Ko, In Se 대한자원환경지질학회 2014 자원환경지질 Vol.47 No.2
NMC 몰랜드 광산은 고생대 조선누층군을 관입한 화성암류에 의해 형성된 접촉교대 또는 스카른 광상으로 공간적으로 제천화강암과 인접해 있어 이 화강암을 관계 화성암으로 간주하여 대보 화성 활동과 관련하여 형성된 광상으로 해석하였으나, 최근에는 백악기 천부 반화강암질 암체에서 기원된 광화유체로부터 스카른화작용과 더불어 Mo 광화작용이 진행된 것이라는 해석이 제시되었다. 본 연구에서는 광산 일원에 대한 중력탐사를 통해 지하구조를 해석함으로써, 지표 지질에서 제천화강암이 광산에 훨씬 인접한 것과는 달리 지하에서는 남쪽의 백악기 무암사화강암이 광산 하부와 주변으로까지 뻗어있을 것으로 여겨지며, 결과적으로 광상 형성의 관계 화성암으로 작용하였을 것임을 제시한다.

Gravity anomaly in the Taebaeksan mineralized zone
신영홍(Young Hong Shin),고인세(In Se Ko) 대한지질학회 2019 지질학회지 Vol.55 No.4
Gravity survey in Taebaeksan mineralized zone began in 2015, although it is the most important mineralized zone in Korea. It is necessary to estimate the spatial distribution of granitic rocks in order to develop ore deposits effectively, since granitic magma penetrates the limestone zone and forms a lot of scarn and hydrothermal deposits. Gravity survey provides a quick and easy way to estimate such spatial distribution of granitic rocks at large areas, because granitic rocks are distinctly less dense than limestone. It is notable that the mines of the Taebaeksan mineralized zone are distributed along the edges of low gravity anomaly, which can be interpreted as the boundary between granitic body and limestone of similar temperature condition of hydrothermal or granitic magma. The Sangdong mine, although its source granite is not exposed on the surface, can be thought to have a underground granitic body by its low gravity anomaly, which is estimated to be much larger than the nearby Eopyeong granite of Geodo mine. Likewise, other ore deposits developed in the area where the granitic body is not exposed show low gravity anomalies indicating that there is a granitic body underground. In addition, the areas where small scale acid dyke is revealed are connected with low gravity, which may imply that they are connected to a larger granitic body underground.