Fig. 1. Geologic map of Ulleung-do (modified from Kim and Kim, 1997: Kim and Lee, 2008: Hwang et al., 2012).
Fig. 2. Location map showing the magnetic data measurement points.
Fig. 3. Diurnal variation in the reference measurement point.
Fig. 4. Total-field magnetic anomaly map constructed using a diurnal variation correction.
Fig. 5. Total-field magnetic anomaly map constructed using the IGRF correction.
Fig. 6. Total-field magnetic anomaly map constructed using RTP.
Fig. 7. Total-field magnetic anomaly map constructed using the analytic signal.
Fig. 8. Magnetic anomaly map reduced to the magnetic pole and geological map.
Fig. 9. Analytic signal map of the magnetic anomaly and geological map.
Table 1. Summary of nomenclature and the history of IGRF
References
- Atchuta, R.D., Babu, H.V.R., Narayan, P.V.S., 1981, Interpretation of magnetic anomalies due to dikes, the complex gradient method, Geophysics, 46, 1572-1578. https://doi.org/10.1190/1.1441164
- Blakely, R.J., 1995, Potential theory in gravity and magnetic applications, Cambridge University Press, 441p.
- Hansen, R.O., Pawlowski, R.S., 1989, Reduction to the pole at low latitudes by Wiener filtering, Geophysics, Vol. 54, pp.1607-1613.
- Harumoto, A., 1970, Volcanic rocks and associated rocks of Utsuryoto Island, Nippon Printing and Publishing, Co, Osaka, 39p.
- Hwang, S.K., Hwang, J.H., Kwon, C.W., 2012, Geological report of the Ulleungdo sheet : Scale 1:50,000, Korea Istitute of Geoscience and Mineral Resources, 84p. (in Korean with English abstract)
- Hsu, S.-K., Sibuet, J.-C., Shyu, C.-T., 1996, High-resolution detection of geologic boundaries from potential-field anomalies: An enhanced analytic signal technique, Geophysics, 61, 373-386. https://doi.org/10.1190/1.1443966
- Kim, K.-B., Lee, G.-D., 2008, A study on volcanic stratigraphy and fault of Ulleung-do, Korea, The Journal of Engineering Geology, 18(3), 321-330. (in Korean with English abstract)
- Kim, K.H., 1996, Naming a quaternary Jeodong Formation in the Jeodong area from Ulreung volcanic island of the East Sea, Journal of Korean Earth Science Society, 17(5), 383-390. (in Korean with English abstract)
- Kim, Y.G., Kim, S.W., 1977, Applied geology of Ulleung-do, Gyeongsangbuk-do, 59p. (in Korean)
- Korea Hydrographic and Oceanographic Agency (KHOA), 1998, Dok-do from Ulleung-do, Marine chart, W177. (in Korean)
- Kwon, B.-D., Kim, K.-J., Kim, S.-R., 1995, Gravity and magnetic investigation of Ulleungdo, Korea, Journal of the Geological Society of Korea, 31(2), 138-150. (in Korean with English abstract)
- Lee, S.-M., Kim, S.-W., Jin, M.-S., 1987, Igneous activities of the cretaceous to the early teriary and their tectonic implications in South Korea, Journal of the Geological Socienty of Korea, 23(4), 338-359. (in Korean with English abstract)
- MacLeod, I.N., S. Vierra, and A.C. Chavaes, 1993, Analytic signal and reduction to the pole in the interpretation of total magnetic field data at low magnetic latitudes, in Proceedings of the Third International Congress of the Brazilian Geophysical Society, Rio de Janeiro.
- Mendonca, C.A., Silva, B.C., 1993, A stable truncated series approximation of the reduction to the pole operator, Geophysics, Vol. 58, pp.1084-1090. https://doi.org/10.1190/1.1443492
- Min, K.D., Kim, O.J., Yun, S., Lee, D.S., Kim, K.H., 1988, Applicability of plate tectonics to the post-late cretaceous igneous activity and mineralization in the Southern part of South Korea (II), Journal of the Geological Society of Korea, 24, 11-40. (in Korean with English abstract)
- Nabigian, M.N., 1972, The analytic signal of two-dimensional magnetic bodies with polygonal cross-section: Its properties and use for automated anomaly interpretation. Geophysics, 37, 507-517.
- Nebere, L., 2015, Reduction to the pole and analytic signal interpretation techniques of magnetic data in equatorial area, Ethiopia, International Journal of Scientific Engineering and Research, doi: 10.21275/28071701, 466-468.
- Park, C.H., Nobuhiro, I., Nobukazu, S., Kim, S.I., 1999, Constraints from magnetic anomalies on the structure of the Ulleung Basin, the East Sea(Japan Sea), using analytic signal and reduction to the pole transformations, Journal of the Geological Society of Korea, 35(4), pp.297-308. (in Korean with English abstract)
- Park, K.-H., 2012, Cyclic igneous activities during the late paleozoic to early cenozoic period over the Korean peninsula, Journal of Petrological Society of Korea, 21(2), 193-202. (in Korean with English abstract) https://doi.org/10.7854/JPSK.2012.21.2.193
- Sagong, H., Kwon, S.-T. Ree, J.-H., 2005, Mesozoic episodic magmatism in South Korea and its tectonic implication, Tectonics, 24, TC5002, doi: 10.1029/2004TC001720, 1-18.
- Silva, B.C.J., 1986, Reduction to the pole as na inverse problem and its application to low latitude anomalies, Geophysics, 51, pp.369-382. https://doi.org/10.1190/1.1442096
- Song, Y.-S., Park, M.-E., Park, K.-H., 2006, Ages and evolutions of the volcanic rocks from Ulleung-do and Dok-do, Journal of Petrological Society of Korea, 15(2), 72-80. (in Korean with English abstract)
- Thurston, J.B., Brown, R.J., 1994, Automated source-edge location with a new variable pass-band horizontal-gradient operator, Geophysics, 59, pp.546-554. https://doi.org/10.1190/1.1443615
- Won, J.K., Lee, M.W., 1984, The volcanism and petrology of alkali volcanic rocks, Ulrung Island, Journal of the Geological Society of Korea, 20(4), 296-305. (in Korean with English abstract)
- Yu, S.H., Hwang, J.S., Min, K.D., Woo, I., 2005, Subsurface geology and geologic structure of the Euiseong Basin using gravity, magnetic, and satellite image data, Economic and Environmental Geology, 38(2), pp.143-153. (in Korean with English abstract)