GPS measurements of crustal deformation in the Baikal-Mongolia area (1994-2002):: Implications for current kinematics of Asia -: art. no. 2501
GPS measurements of crustal deformation in the Baikal-Mongolia area (1994-2002):: Implications for current kinematics of Asia -: art. no. 2501
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DOI：
10.1029/2002jb002373
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发表时间：
2003-10-25
影响因子：
3.9
通讯作者：
Déverchère, J
中科院分区：
文献类型：
--
作者：
Calais, E;Vergnolle, M;Déverchère, J
[1]我们根据贝加尔裂谷带的GPS测量值和蒙古蒙古人的1994年2002年期间的GPS测量，在北亚的大部分地区呈现了地壳速度的新大地测量结果。我们将结果与Wang等人中国的GPS速度场相结合。 [2001]并在大多数亚洲得出一致的速度场。我们发现蒙古的运动学和应变状态形成鲜明对比，蒙古最西端的北向速度和N-S缩短，但向东向东南运动和蒙古中部和东部的左侧剪切。 E-W趋势Tunka，Bolnay和Gobi Altay断层（2 +/- 1.2 mm yr（-1），2.6 +/- 1.0 mm yr（2 +/- 1.0 mm yr（2 +/- 1.0 mm yr（2 +/- 1.0毫米） -1）和1.2 mm yr（-1）和整个贝加尔裂谷区域的延伸率分别为4 mm yr（-1）。因此，通过N-S缩短与蒙古Altay的右旋剪切相似，与印度 - 欧亚融合的15％相似，在tien shan以北，以及沿着蒙古中部和东部蒙古沿重大左侧滑动滑移断层的向东流离失所。我们发现，北中国和南部的逆时针旋转是围绕Stanovoy带以北的一个极点的准韧带块，该块排除了以前定义的Amurian板块的存在，这意味着左 - yr（-1）<2 mm yr（-1） Qinling Shan断层区域上的横向滑动。
[1] We present new geodetic results of crustal velocities over a large part of northern Asia based on GPS measurements in the Baikal rift zone and Mongolia spanning the 1994 2002 period. We combine our results with the GPS velocity field for China of Wang et al. [ 2001] and derive a consistent velocity field for most of Asia. We find contrasted kinematic and strain regimes in Mongolia, with northward velocities and N-S shortening in westernmost Mongolia but eastward to southeastward motion and left-lateral shear for central and eastern Mongolia. This eastward to southeastward motion of central and eastern Mongolia is accommodated by left-lateral slip on the E-W trending Tunka, Bolnay, and Gobi Altay faults (2 +/- 1.2 mm yr(-1), 2.6 +/- 1.0 mm yr(-1), and 1.2 mm yr(-1), respectively) and by about 4 mm yr(-1) of extension across the Baikal rift zone. Consequently, similar to 15% of the India-Eurasia convergence is accommodated north of the Tien Shan, by N-S shortening combined with dextral shear in the Mongolian Altay and by eastward displacements along major left-lateral strike-slip faults in central and eastern Mongolia. We find a counterclockwise rotation of north and south China as a quasi-rigid block around a pole north of the Stanovoy belt, which rules out the existence of an Amurian plate as previously defined and implies < 2 mm yr(-1) of left- lateral slip on the Qinling Shan fault zone.