Improving accuracy of altimeter-derived marine gravity anomalies in the East Vietnam Sea deep-basin and adjacent area

Tran Tuan Dung, Nguyen Van Sang, Nguyen Ba Dai, Nguyen Kim Dung, Tran Trong Lap, Tran Tuan Duong, Nguyen Thi Hai Ha
Author affiliations

Authors

  • Tran Tuan Dung Institute of Marine Geology and Geophysics, VAST, Vietnam Graduate University of Science and Technology, VAST, Vietnam
  • Nguyen Van Sang Hanoi University of Mining and Geology, Hanoi, Vietnam
  • Nguyen Ba Dai Institute of Marine Geology and Geophysics, VAST, Vietnam
  • Nguyen Kim Dung Institute of Marine Geology and Geophysics, VAST, Vietnam
  • Tran Trong Lap Institute of Marine Geology and Geophysics, VAST, Vietnam
  • Tran Tuan Duong Institute of Marine Geology and Geophysics, VAST, Vietnam
  • Nguyen Thi Hai Ha PetroVietnam University, Ba Ria-Vung Tau, Vietnam

DOI:

https://doi.org/10.15625/1859-3097/19/3B/14497

Keywords:

Altimeter-derived gravity, shipboard gravity, East Vietnam Sea deep-basin, least squares collocation.

Abstract

In recent years, the satellite altimeter technology allows enhancing the marine investigation in many areas. Up to now, many scientific studies have attempted to improve the accuracy and resolution of altimeter-derived gravity anomalies and have produced a gravity grid with interval of 1’×1’ for most oceans all over the world. However, these gravity anomalies are not very highly accurate and have a large difference compared to shipboard gravity anomalies, especially in the coastal and islands areas. The purpose of this article is to improve the accuracy of altimeter-derived marine gravity anomalies for geological structure research in the East Vietnam Sea deep-basin and adjacent areas. The least squares collocation method is used to correct the altimeter-derived marine gravity data based on the shipboard gravity data in order to improve the accuracy of marine gravity anomalies. In this article, the altimeter-derived marine gravity anomalies are taken from Sandwell, D. T., et al., (V24.1) and the shipboard gravity anomalies are from the survey projects between Vietnam, Russia and other countries. The mean-squared error when comparing both data is about 9,358 mGal. After correcting by collocation method, the error was reduced to 3,208 mGal (for the altimeter data coinciding with shipboard track). Also, in this article, the achieved results show the efficiency and actuality of the corrected-altimeter-derived marine gravity anomalies for more detailed researches of geological structures. Especially, it is more meaningful in the remote or sparsely surveyed regions.

Downloads

Download data is not yet available.

Metrics

Metrics Loading ...

References

Sandwell, D. T., Müller, R. D., Smith, W. H., Garcia, E., and Francis, R., 2014. New global marine gravity model from CryoSat-2 and Jason-1 reveals buried tectonic structure. Science, 346(6205), 65–67. doi: 10.1126/science.1258213.

Sandwell, D. T., and Smith, W. H., 1997. Marine gravity anomaly from Geosat and ERS 1 satellite altimetry. Journal of Geophysical Research: Solid Earth, 102(B5), 10039–10054.

Sandwell, D. T., and Smith, W. H., 2009. Global marine gravity from retracked Geosat and ERS‐1 altimetry: Ridge segmentation versus spreading rate. Journal of Geophysical Research: Solid Earth, 114(B1), B014411. http://dx.doi.org/10.1029/2008JB 006008.

Motao, H. U. A. N. G., Guojun, Z., and Yongzhong, O., 2006. Recovery of Marine Gravity Field Using Integrated Data from Multi-Satellite Missions. Science of Surveying and Mapping, 31(6), 37–39.

Andersen, O. B., Knudsen, P., and Berry, P. A., 2010. The DNSC08GRA global marine gravity field from double retracked satellite altimetry. Journal of Geodesy, 84(3), 191–199. DOI 10.1007/s00190-009-0355-9.

Zhang, S., and Sandwell, D. T., 2017. Retracking of SARAL/AltiKa radar altimetry waveforms for optimal gravity field recovery. Marine Geodesy, 40(1), 40–56. http://dx.doi.org/10.1080/014904 19.2016.1265032.

Bùi Công Quế, Trần Tuấn Dũng, Lê Trâm, 2008. Thành lập bản đồ dị thường trọng lực thống nhất trên vùng biển Việt Nam và kế cận. Tạp chí Khoa học và Công nghệ biển, 8(2), 29–41.

Nguyễn Văn Sáng, 2012. Xác định dị thường trọng lực cho vùng biển Việt Nam bằng kết quả đo cao vệ tinh. Luận án Tiến sĩ Khoa học kỹ thuật. Trường Đại học Tổng hợp Trắc địa và Bản đồ Moskva, Liên bang Nga.

http://bgi.obs-mip.fr/data-products/Gravi-ty-Databases/Marine-Gravity-data.

Institute of Marine Geology and Geophysics, 2007. Gravity, magnetic and seismic data of RV Professor Polshkov (Russia), 2007–2008.

POI FEB-RAS, 1990. Gravity and magnetic data of RV Professor Gagarinskiy (Russia), 1990–1992.

Tscherning, C. C., and Rapp, R. H., 1974. Closed covariance expressions for gravity anomalies, geoid undulations, and deflections of the vertical implied by anomaly degree variance models. Scientific Interim Report Ohio State Univ., Columbus. Dept. of Geodetic Science.

Nielsen, J., Tscherning, C. C., Jansson, T. R., and Forsberg, R., 2012. Development and User Testing of a Python Interface to the GRAVSOFT Gravity Field Programs. In Geodesy for Planet Earth (pp. 443–449). Springer, Berlin, Heidelberg.

Garcia, E. S., Sandwell, D. T., and Smith, W. H., 2014. Retracking CryoSat-2, Envisat and Jason-1 radar altimetry waveforms for improved gravity field recovery. Geophysical Journal International, 196(3), 1402–1422. doi: 10.1093/gji/ggt469.

Forsberg, R., and Tscherning, C., 2008. Geodetic Gravity Field Modelling Programs. Manual do usuário, Niels Bohr Institute, University of Copenhagen, Copenhagen.

Dung, T. T., Que, B. C., and Phuong, N. H., 2013. Cenozoic basement structure of the South China Sea and adjacent areas by modeling and interpreting gravity data. Russian Journal of Pacific Geology, 7(4), 227–236.

Downloads

Published

21-10-2019

How to Cite

Dung, T. T., Sang, N. V., Dai, N. B., Dung, N. K., Lap, T. T., Duong, T. T., & Ha, N. T. H. (2019). Improving accuracy of altimeter-derived marine gravity anomalies in the East Vietnam Sea deep-basin and adjacent area. Vietnam Journal of Marine Science and Technology, 19(3B), 43–53. https://doi.org/10.15625/1859-3097/19/3B/14497

Issue

Section

Articles