PRESENT DAY TECTONIC GRADIENT IN NINH THUAN AND SURROUNDING REGION

Phan Trong Trinh, Ngo Van Liem, Vy Quoc Hai, Tran Van Phong, Nguyen Van Huong, Nguyen Viet Thuan, Nguyen Quang Xuyen, Bui Van Thom, Nguyen Dang Tuc, Hoang Quang Vinh, Nguyen Huy Thinh, Bui Thi Thao, Tran Quoc Hung

Abstract


The estimation of the present day tectonic movement and tectonic gradient (strain rate) has an important practical signification in the assessment of active fault and seismic hazards for the selection of Ninh Thuan nuclear power plant. Based on the three campaigns of GPS measurement between 2012 - 2013, we used BERNESE 5.0 software to determine present day slip rates of 13 stations in ITRF08 frame. The GPS stations move eastwards at the slip rates of 22 - 25 mm/yr, southwards at the velocities of 5 - 10 mm/yr. The standard errors in latitudinal and longitudinal directions are 1.2 mm/yr and 0.9 mm/yr, respectively. Combined with GPS data from the project of the study on actual geodynamics in Tay Nguyen TN3/06, we determined the strain rate ranging from 50 to 100 nanostrains with the standard error of 50 nanostrains. The direction of  maximum compressive strain rate is from northwest - southeast to east - west.

Keywords


GPS, present-day tectonics, veolocity, tectonic gradient, strain rate, maximum compressive axe, maximum extensive axe.

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References


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DOI: https://doi.org/10.15625/1859-3097/15/3/7216

Journal of Marine Science and Technology ISSN: 1859 3097

Published by Vietnam Academy of Science and Technology