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Digital Gravity Anomaly Map of KIGAM

한국지질자원연구원 디지털 중력 이상도

  • Lim, Mutaek (Korea Institute of Geoscience and Mineral Resources) ;
  • Shin, Younghong (Korea Institute of Geoscience and Mineral Resources) ;
  • Park, Yeong-Sue (Korea Institute of Geoscience and Mineral Resources) ;
  • Rim, Hyoungrea (Department of Earth Science Education, Pusan National University) ;
  • Ko, In Se (Korea Institute of Geoscience and Mineral Resources) ;
  • Park, Changseok (Korea Institute of Geoscience and Mineral Resources)
  • Received : 2019.01.07
  • Accepted : 2019.02.25
  • Published : 2019.02.28

Abstract

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 $4km{\times}4km$ 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.

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Fig. 1. Gravity survey data distribution.

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Fig. 2. Network adjustment error (left) and points to be verified in the future (right).

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Fig. 3. Distribution of granitoids (left), Bouguer anomaly (middle) and isostatic anomaly (right): Tectonic zoning and classification of granitoids are referrred to Chough et al. (2000).

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Fig. 4. Comparison of isostatic anomaly maps and their data distribution: map by Shin et al. (2006) (left), isostatic anomaly map from the Bouguer anomaly map of KIGAM (2014) (middle), and map of this study (right).

Acknowledgement

Supported by : 한국지질자원연구원

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