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Discrepancies between free air gravity anomalies from EGM2008 and the ones from dense gravity/GPS observations at west Sichuan Basin

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doi: 10.6038/cig20131117
Authors:Fu Guangyu; Zhu Yiqing; Gao Shanghua; Liang Weifeng; Jin Honglin; Yang Guangliang; Zhou Xin; Guo Shusong; Xu Yunma; Du Weiji
Author Affiliations:Primary:
China Earthquake Administration, Institute of Earthquake Science, Beijing, China
Chinese Academy of Sciences, China
Volume Title:Diqiu Wulixue Bao Acta Geophysica Sinica
Source:Diqiu Wulixue Bao = Acta Geophysica Sinica, 56(11), p.3761-3769. Publisher: Science Press, Beijing, China. ISSN: 0001-5733
Publication Date:2013
Note:In Chinese with English summary. 19 refs.; illus., incl. 2 tables, sketch maps
Summary:Recently, we built a dense regional observation network made up of 302 stations in the western Sichuan Basin and carried out a gravity/GPS hybrid observation campaign. We plan to find the detailed features of the Free-air Gravity Anomaly (FGA) at the study area and evaluate the quality of the modeled results of EGM2008. Overall, the observed FGAs are negative. They change slowly from about -160×10-5 ms-2 in the west to -60×10-5 ms-2 east of the study area. The modeled FGAs from EGM2008 correlate well with the topography of the western Sichuan Basin. There are visible modeled gravity gradient belts at both the Longquan Mountains and the boundary of the Sichuan Basin and Tibetan Plateau. In the southeastern study area, the modeled FGAs are about -50×10-5 ms-2. However, at the Chengdu plain west of the Longquan Mountains, the modeled FGAs become as large as -120×10-5 ms-2. The discrepancies between the modeled FGAs and the observed ones change slightly round -10×10-5 ms-2 at most points of our observation network, indicating that the EGM2008 can recover the total distribution shape of the earth's gravitational field in the study area. If adjusted by several in situ observation results at the earth's surface, the EGM2008 will reflect the real gravitational field of the earth well.
Subjects:Free-air anomalies; Geodesy; Global navigation satellite systems; Global Positioning System; Gravity anomalies; Gravity field; Observations; Asia; China; Far East; Longquan Mountain; Szechwan Basin
Coordinates:N303501 N303501 E1041802 E1041802
Record ID:762949-17
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