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Installation and Data Analysis of Superconducting Gravimeter in MunGyung, Korea; Preliminary Results  

Kim, Tae-Hee (Department of Geoinformation Engineering, Sejong University)
Neumeyer, Juergen (GeoForschungZentrum Potsdam, Dept. of Geodesy & Remote Sensing)
Woo, Ik (Ocean System Engineering, Kunsan National University)
Park, Hyuck-Jin (Department of Geoinformation Engineering, Sejong University)
Kim, Jeong-Woo (Department of Geoinformation Engineering, Sejong University)
Publication Information
Economic and Environmental Geology / v.40, no.4, 2007 , pp. 445-459 More about this Journal
Abstract
Superconducting Gravimeter(SG) was installed and has been successfully operated at MunGyung, Kyungsang province in Korea in March 2005. It was registered as the 21st observatory of the Global Geodynamics Project. Since SG can precisely measure the gravity variations below the 1mHz frequency band, it has the outstanding capability to sense and resolve many different periodic gravity components from each other. From the raw data collected between 18 March 2005 and 21 February 2006 diurnal and semi-diurnal tidal band's residual gravity components were analyzed. During this process, the instrumental noises, air pressure, and ground water corrections were carried out. Values of $-3.18nm/s^2/hPa\;and\;17nm/s^2/m$ were used respectively in the air pressure and groundwater corrections. Hartmann-Wenzel and Whar-Dehant Earth tide models were adopted to compute the residual gravity for Q1, O1, P1, K1, M2, N2, S2, K2 tidal bands. For the ocean loading correction, SCW80, FES952, and FES02 models were used and compared. As a result, FES02 ocean loading model has shown the best match for the data processing at MunGyung SG MunGyung SG gravity was compared with GRACE satellite gravity. The correlation coefficient between the two gravity after groundwater correction was 0.628, which is higher than before ground water correction. To evaluate sensitivity at MunGyung SG gravity statition, the gravity data measured during 2005 Indodesian earthquake was compared with STS-2 broad band seismometer data. The result clearly revealed that the SG could recorded the same period of earthquake with seismometer event and a few after-shock events those were detected by seismometer.
Keywords
Superconducting gravimeter; Earth tides; Ocean loading; Air pressure and ground water corrections; GRACE gravity; Comparison with seismometer data;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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