Browse > Article
http://dx.doi.org/10.9719/EEG.2015.48.6.451

External Gravity Field in the Korean Peninsula Area  

Jung, Ae Young (Department of Earth-Science Education, Pusan National University)
Choi, Kwang-Sun (Department of Earth-Science Education, Pusan National University)
Lee, Young-Cheol (Department of Earth-Science Education, Pusan National University)
Lee, Jung Mo (School of Earth System Sciences, Kyungpoook National University)
Publication Information
Economic and Environmental Geology / v.48, no.6, 2015 , pp. 451-465 More about this Journal
Abstract
The free-air anomalies are computed using a data set from various types of gravity measurements in the Korean Peninsula area. The gravity values extracted from the Earth Gravitational Model 2008 are used in the surrounding region. The upward continuation technique suggested by Dragomir is used in the computation of the external free-air anomalies at various altitudes. The integration radius 10 times the altitude is used in order to keep the accuracy of results and computational resources. The direct geodesic formula developed by Bowring is employed in integration. At the 1-km altitude, the free-air anomalies vary from -41.315 to 189.327 mgal with the standard deviation of 22.612 mgal. At the 3-km altitude, they vary from -36.478 to 156.209 mgal with the standard deviation of 20.641 mgal. At the 1,000-km altitude, they vary from 3.170 to 5.864 mgal with the standard deviation of 0.670 mgal. The predicted free-air anomalies at 3-km altitude are compared to the published free-air anomalies reduced from the airborne gravity measurements at the same altitude. The rms difference is 3.88 mgal. Considering the reported 2.21-mgal airborne gravity cross-over accuracy, this rms difference is not serious. Possible causes in the difference appear to be external free-air anomaly simulation errors in this work and/or the gravity reduction errors of the other. The external gravity field is predicted by adding the external free-air anomaly to the normal gravity computed using the closed form formula for the gravity above and below the surface of the ellipsoid. The predicted external gravity field in this work is expected to reasonably present the real external gravity field. This work seems to be the first structured research on the external free-air anomaly in the Korean Peninsula area, and the external gravity field can be used to improve the accuracy of the inertial navigation system.
Keywords
external free-air gravity anomaly; external gravity field; upward continuation; inertial navigation system; gravity anomaly;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
연도 인용수 순위
1 Park, R., Kang, H. and Jon, G. (1996) Geology of Korea. Foreign Language Books Publishing House, PyongYang, 631p.
2 Rabus, B., Eineder, M., Roth, A. and Bamler, R. (2003) The shuttle radar topography mission - a new class of digital elevation models acquired by spaceborne radar. Jour. of Photogrammetry and Remote Sensing, v.57, p.241-262.   DOI
3 Robbins, A.R. (1952) Length and Azimuth of Long Lines on the Earth. Empire Survey Review, no. 84, p.268-274.
4 Robbins, A.R. (1962) Long Lines on the Ellipsoid. Empire Survey Review, no.125, p.301-309.
5 Ryu, B.M. (1998) Geodesy, Dongmyung Co., Seoul, 393p.
6 Seo, S.N. (2008) Digital 30sec Gridded Bathymetric Data of Korea Marginal Seas - KorBathy30s. Jour. of Korean Soc. of Coastal and Ocean Engineers, v.20, p.110-120.
7 Won, J.H. (2000) Precise Geoid in and around the Southern Korean Peninsula from Gravity and GPS Data, Ph.D. Thesis, Pusan National University, 159p.
8 Bowring, B.R. (1981) The direct and inverse problems for short geodesics lines on the ellipsoid. Surveying and Mapping, v.41, no.2, p.135-141.
9 Choi, K.-S. (1986) A Study on Gravity in the Southern Part of the Korean Peninsula, Ph.D. Thesis, Seoul National University, 110p.
10 Choi, K.-S., Park, P.H. and Shin, Y.H. (1998) Gravity Surveying with GPS. Jour. Korean Earth Science Soc., v.19, no.2, p.120-126.
11 Choi, K.-S. and Lee, Y.-C. (2011) Analysis of Global gravitational Models based on measured gravity data, The Korean Institute of Maritime Information and Commucation Sciences, v.15, p.1833-1839.
12 Choi, B.H., Kim, K.O. and Eum, H.M. (2002) Digital Bathymetric and Topographic Data for Neighboring Seas of Korea. Jour, of Korean Soc. Coastal and Ocean Engineers, v.14, no.1, p.41-50.
13 Choi, K.-S. and Lee, J.M. (1997) GPS/levelling Geoid of the South Korean Peninsula. Korean Jour. Geophysical Research., v.25, p.15-22.
14 Dragomir, V., Ghitau, M., Mihilescu, M. and Rotaru, M. (1982) Theory of the Earth's shape. Elsevier, Amsterdam, 694p.
15 Choi, K.-S., Yang, C.S., Shin, Y.H. and Ok, S.S. (2003) On the improvement of precision in gravity surveying and correction, and a dense Bouguer anomaly in and around the Korean Peninsula. Jour. Korean Earth Science Soc., v.24, no.3, p.205-215.
16 DMA (1991) Department of defense World Geodetic System 1984. DMA Technical Report.
17 DMA (1996) Performance specification Digital Terrain Elevation Data (DTED), Defence Mapping Agency, Document Number: MIL-PRF-89020A, 40 p.
18 GEBCO, 2003, http://www.ngdc.noaa.gov/mgg/gebco/gebco.html.
19 Global seafloor topography, 2007, http://topex.used.edu/marine_topo/mar_topo.html.
20 Geological Survey of Japan, 2000, https://www.gsj.jp/HomePage.html.
21 Heiskanen, W.A. and Moritz. H. (1967) Physical Geodesy. W.H. Freeman and Co., 345p.
22 Hofmann-Wellenhof, B. and Moritz, H. (2005) Physical geodesy, Springer-Verlag, Wien, 403p.
23 Jank, W. and Kivioja, L.A. (1980) Solution of the Direct and Inverse Problems on Reference Ellipsoids by Point-by-Point Integration Using Programmable Pocket Calculators. Surveying and Mapping, v.40, p.325-337.
24 JEGG, 2006, http://www.jodc.go.jp/data_set/jodc/jegg_intro.html.
25 Jekeli, C., Lee, J.-K. and Kwon, J. H. (2007) Modeling errors in upward continuation for INS gravity compensation, J. Geod. v.81, p.297-309.   DOI
26 Lee, J.S., Kwon, J.H., Lee, B.M. and Hong, C.K. (2009) Free-air anomaly from Airborne Gravity Surveying. Jour. Korean Soc. Surveying, Geodesy, Photogrammetry and Cartography, v.27, no.2, p.139-147.
27 Kivioja, L.A. (1971) Computation of geodetic direct and indirect problems by computers accumulating increments from geodetic line elements. Bull. Geodesy, v.99, no.1, p.55-63.   DOI
28 Kwon, J.H. and Jekeli, C. (2005) Gravity requirements for compensation of ultra-precise intertial navigation, L Navigat, v.58, p.479-492.   DOI
29 Korea Ministry of Land, Transport and Maritime Affairs (2005) Study on the Determination of the Precise Geoid Model, Final Report, 101 p. (in Korean with English abstract)
30 Lee, S.B. (2000) A Study on the Geoid Modeling by Gravimetric Methods and Methods of Satellite Geodesy. Jour. of the Korean Soc. Geospatial Information Science, v. 18, no.4, p.359-367.
31 Lee, Y.-C. (2008) Precise Geoid and Gravity Anomaly in and around Jeju island, Ph.D. Thesis, Pusan National University, 144p.
32 Li, X. and Gtze. H.-S. (2001) Tutorial: Ellipsoid, geoid, gravity, geodesy, and geophysics, Geophysics, v.66, p.1660-1668.   DOI
33 Murphy, D.W. (1981) Direct Problem Geodetic Computation Using a Programmable Pocket Calculator. Survey Review., v.26, no.199, p.11-15.   DOI
34 Orlin H. (1959) The Three Components of the External Anomalous Gravity Field. Jour.Geophysical Research., p.2395.
35 Pavlis, N.K., Holmes, S.A., Kenyon, S.C. and Factor, J.K. (2008) An Earth Gravitational Model to Degree 2160: EGM2008. presented at the 2008 General Assembly of the European Geosciences Union, Vienna, Austria, April 13-18.