• Tran Tuan Dung Institute of Marine Geology and Geophysics, VAST, Vietnam Graduate Universiy of Science and Technology, VAST, Vietnam
  • R. G. Kulinich V.I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch of Russia Academy of Sciences, Russia
  • Ngo Thi Bich Tram Department of Cartography, General Staff of the Vietnam People’s Army
  • Nguyen Quang Minh Institute of Marine Geology and Geophysics, VAST, Vietnam
  • Nguyen Ba Dai Institute of Marine Geology and Geophysics, VAST, Vietnam
  • Tran Tuan Duong
  • Nguyen Thai Son Institute of Geography, VAST, Vietnam



Hoang Sa archipelago, satellite-derived gravity, present-day stress field, earthquake’s focal mechanism, Earth’s crust displacement.


Present-day stress filed in the Hoang Sa archipelago and adjacent areas is determined through the earthquake’s focal mechanism parameters that have been recorded during a time period of more than 100 years. The geometric parameters of the faults (such as the location, strike and dip angles as well as depth, length…) are determined by satellite-derived gravity, seismic data and stress fields. In this study, predictive determination of the magnitude and tendency of the relative displacement of the Earth’s crust is carried out by calculating and assessing the relationship between the stress fields and fault’s geometric parameters. On the basis of the Earth’s crust relative displacement, the geodynamic mechanism of the Hoang Sa archipelago and adjacent areas through the different geological periods can be rebuilt. Magnitude and tendency of the relative displacement of the Earth’s crust are represented by the color spectrum and the vector’s magnitude. Although the displacement appears in the whole region, its intensities are different in particular areas that have the faults systems with different grades.


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