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신영홍,박종욱,서기원 한국지구과학회 2009 한국지구과학회지 Vol.30 No.3
The Modern Geodesy monitors physical and geometrical shape and motion of the Earth and, more importantly, its temporal variations with unprecedented precision. It provides accurate and stable reference frames for Earth observations in the Space era. Furthermore, with an aid of interdisciplinary approaches, it also traces the causes of the variations in shape and motion of the Earth and eventually contributes to a better understanding of the Earth system. The International Association of Geodesy (IAG) has established the Global Geodetic Observing System (GGOS) to integrate the multitude of geodetic tools and tried to contribute to the management of global environmental changes as a partner of the Global Earth Observation System of Systems (GEOSS). Here we introduce the contribution of geodesy to the various fields of Earth Science by focusing on GGOS and encourage interdisciplinary researches. 현대 측지학은 전례 없는 정밀도로 지구의 물리·기하학적 형상과 운동, 특히 이의 변화를 감시하고 있다. 이는 우주시대의 지구관측을 위한 정확하고 통일된 기준좌표계를 제공할 뿐만 아니라, 학제적 연구를 통해 지구형상과 운동의 변화를 일으키는 원인을 규명함으로써 궁극적으로는 지구시스템의 정확한 이해에 기여하고 있다. 국제측지연맹에서는 다양한 측지학적 도구들을 통합하고자 지구측지관측시스템(GGOS)을 구축하고, 전지구관측시스템(GEOSS)의 주요 파트너로서 지구환경변화에 대응하려는 인류의 노력에 기여하고 있다. 여기서는 지구측지관측시스템을 중심으로 측지학이 전지구관측시스템 및 지구과학의 여러 영역과 어떤 관계를 가지는지를 살펴보고, 학제적 연구의 동기 부여를 촉진하고자 한다.
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. NMC Moland mine, which is classified as a contact replacement or skarn deposit, has been interpreted to have been formed by Daebo igneous activity which intruded into the Joseon Supergroup, because it is quite closely located to Jecheon granite. However, an alternative interpretation was recently suggested that the mine could be related with the hydrothermal fluid originated from Cretaceous granitic rocks, bringing about skarnization and Mo mineralization. Here we present an interpretation on the source granite of the mine based on the gravity exploration: the gravity anomaly, unlike the surface geology, shows that the Muamsa granite could be the related granite of the mine, because its hidden subsurface structure is expected to be more widely extended to surrounding area of the mine and deeper than the Jecheon granite.
신영홍,박종욱,박필호 한국지구과학회 2006 韓國地球科學會誌 Vol.27 No.6
The Moho structure and its deformation in the southern part of the Korean Peninsula were estimated usinggravity and topography data. Gravity signals from the upper and lower crust were separated using a filter that wascomputed from isostacy and elastic thickness. The result of this study shows three characteristic features of the Mohodeformation. First, the Moho folding structure is parallel to SKTL (the South Korean Tectonic Line), which indicatespositive association with the collision of the Yeongnam and Gyeonggi Masifs and repeated compression afterwards. Incontrast, noticeable deformation of the Moho was not observed along the Imjingang Belt, which is interpreted as anotherrisen; this seems to be the result from both the collisional compression and buoyancy caused by magmatic underplating.Third, the Moho deformation is shallowest in the east of the Taebaek Mountains and deepens toward the west, consistentwith the topographic characteristic of the Korean Peninsula of “high east and low west”. It can be interpreted as theresults of the opening of the East Sea and Ulleung Basin. A tectonic explanation for this could be the ascent of themantle induced by continental rifting and horizontal extension at the early stage of the opening of the East Sea. TheMoho deformation model computed in this study correlates well with the earthquake distribution and crustal movementmeasured by GPS. We suggest that the compression along the SKTL is still exerted, consequently, the Moho deformationis active, although it may be weak.......... Moho deformation, gravity inversion, isostasy, continental collision, magmatic underplating. . : ... .... ... .. ... .... ...... ... ... ..... . ... .. ... .