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In this paper the authors present the error estimation in determining main parameters of earthquake hypocenter based on solving the system of linear equations, expressing the relationship between earthquake coordinates and the coordinates of the seismic stations. The results of the error estimation in determining the epicenter coordinates and the focus depth of the earthquakes recorded by the system of 30 seismic stations in Vietnam are presented, interpreted and compared with the results of the previous studies. | Vietnam Journal of Earth Sciences, 40(1), 1-16, Doi: 10.15625/0866-7187/40/1/10875 Vietnam Academy of Science and Technology Vietnam Journal of Earth Sciences (VAST) http://www.vjs.ac.vn/index.php/jse Estimation of errors in determination of main parameters of earthquake hypocenter, recorded by the national seismic network of Vietnam Ngo Thi Lu1,2*, Burmin V. Y.3, Phung Thi Thu Hang1,2, Vu Thi Hoan1, Ha Thi Giang1 1 Institute of Geophysics, Vietnam Academy of Science and Technology, Hanoi, Vietnam Graduate University of Science and Technology, Hanoi, Vietnam 3 Institute of Physics of the Earth, Russian Academy of Sciences. 10, B. Gruzinskaya st., 123995, Moscow, Russia 2 Received 8 June 2017; Received in revised form 27 October 2017; Accepted 10 November 2017 ABSTRACT In this paper the authors present the error estimation in determining main parameters of earthquake hypocenter based on solving the system of linear equations, expressing the relationship between earthquake coordinates and the coordinates of the seismic stations. The results of the error estimation in determining the epicenter coordinates and the focus depth of the earthquakes recorded by the system of 30 seismic stations in Vietnam are presented, interpreted and compared with the results of the previous studies. The results show that the operation of the seismic network of Vietnam is not really optimal, particularly when determining the epicenter coordinates and the focus depth of the earthquakes in the East Vietnam Sea region. The national seismic network of Vietnam allows determination of the epicenter coordinates and the focal depth of earthquakes for most of the Vietnam territory with the errors ∆h ≤ 20 km, ∆φ ≤ 4 km, ∆ ≤ 5 km. The errors of the determination of the epicenter coordinates and the focal depth of the earthquakes are increasing to the south and southwest areas of the territory of Vietnam and reach the maximum in these areas. Particularly, errors of the determination of the .
