首页|Contemporary horizontal crustal movement estimation for northwestern Vietnam inferred from repeated GPS measurements

Contemporary horizontal crustal movement estimation for northwestern Vietnam inferred from repeated GPS measurements

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  • NSTL
  • Springer Nature
We present a horizontal velocity field determined from a GPS network with 22 sites surveyed from 2001 to 2012 in northwestern Vietnam. The velocity is accurately estimated at each site by fitting a linear trend to each coordinate time series, after accounting for coseismic displacements caused by the 2004 Sumatra and the 2011 Tohoku earthquakes using static fault models. Considering the coseismic effects of the earthquakes, the motion of northwestern Vietnam is 34.3 ± 0.7 mm/yr at an azimuth of N108? ± 0.7?E in ITRF2008. This motion is close to, but slightly different from, that of the South China block. The area is in a transition zone between this block, the Sundaland block, and the Baoshan sub-block. At the local scale, a detailed estimation of the crustal deformation across major fault zones is geodetically revealed for the first time. We identify a locking depth of 15.3 ± 9.8 km with an accumulating left-lateral slip rate of 1.8 ± 0.3 mm/yr for the Dien Bien Phu fault, and a shallow locking depth with a right-lateral slip rate of 1.0 ± 0.6 mm/yr for the Son La and Da River faults.

Crustal movementGPScoseismic offsetearthquakenorthwestern Vietnam

Takeshi Sagiya、Fumiaki Kimata、Duong Chi Cong、Nguyen Anh Duong、Tran Dinh To、Vy Quoc Hai、Nguyen Xuan Binh、Nguyen Dinh Xuyen

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Nagoya University, D2-2 (510), Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan

Tono Research Institute of Earthquake Science, 1-63 Yamanouchi, Akeyo-cho, Mizunami 509-6132, Japan

Vietnam Institute of Geodesy and Cartography, 479 Hoang Quoc Viet Street, Cau Giay, Hanoi, Vietnam

Institute of Geophysics, Vietnam Academy of Science and Technology, Bldg. A8, 18 Hoang Quoc Viet Street, Cau Giay, Hanoi, Vietnam

Institute of Geological Sciences, Vietnam Academy of Science and Technology, 84 Chua Lang Street, Dong Da, Hanoi, Vietnam

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2013

10.5047/eps.2013.09.010

Earth, planets and space

Earth, planets and space

ISSN：1343-8832
年,卷(期)：2013.65(12)
  • 11
  • 46