Inversion of seafloor topography in Emperor Seamount sea area by combined gravity anomalies and vertical gravity gradient anomalies data

Yang Fanlin; Shen Ruijie; Mei Sai; Tu Zejie; Xin Mingzhen

doi:10.12284/hyxb2022145

Volume 44 Issue 12

Jan. 2023

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Article Navigation > Haiyang Xuebao > 2022 > 44(12): 126-135

Yang Fanlin，Shen Ruijie，Mei Sai, et al. Inversion of seafloor topography in Emperor Seamount sea area by combined gravity anomalies and vertical gravity gradient anomalies data[J]. Haiyang Xuebao，2022, 44(12)：126–135 doi: 10.12284/hyxb2022145

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Inversion of seafloor topography in Emperor Seamount sea area by combined gravity anomalies and vertical gravity gradient anomalies data

doi: 10.12284/hyxb2022145

Yang Fanlin^{1, 2
,},
Shen Ruijie^{1, 2},
Mei Sai^{3
,
,},
Tu Zejie^{1, 2},
Xin Mingzhen^{1, 2}

1.
College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 266590, China
2.
Key Laboratory of Oceanic Surveying and Mapping, Ministry of Natural Resources, Qingdao 266590, China
3.
Qingdao Institute of Marine Geology, China Geological Survey, Ministry of Natural Resources, Qingdao 266237, China

Received Date: 2022-04-19
Rev Recd Date: 2022-06-07

Available Online: 2022-08-26

Publish Date: 2023-01-17

Abstract

Abstract

The topography of the seafloor is extremely important for marine scientific surveys and research. Echo-sounding technology, represented by multi-beam sounding, is costly and inefficient, and has only achieved about 20% of the world’s seabed mapping for decades. For the remaining void area, especially the deep ocean, it can be obtained by regression analysis using gravity anomalies and vertical gravity gradient anomalies, but the robustness of scale factor is poor. To address this issue, and considering the different advantages of the two kinds of gravity data in the characterization of the long and short wavelengths of the seafloor topography, a method which combining sliding window weighting and robust regression analysis was introduced in this paper. The experimental results in the Emperor Seamount in the Pacific Ocean (35°−45°N, 165°−175°E) indicate that: taking the ship test data as the checking condition, the standard deviation of the constructed model is 61.02 m, compared with the single gravity data inversion model, the accuracy was improved 14.92% (gravity anomalies) and 2.08% (vertical gravity gradient anomalies), which can better reflect the topographic trend of the Emperor Seamount Chain.
- gravity anomalies,
- vertical gravity gradient anomalies,
- seafloor topography,
- robust regression analysis,
- sliding window

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References(29)

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