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Kinematic model of crustal deformation of Fenwei basin, China based on GPS observations

机译：基于GPS观测的of渭盆地地壳形变运动学模型

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摘要

Using high precision GPS data for the period of 1999-2007 from the China Crustal Movement Observation Network, we have constructed a plate kinematic model of crustal deformation of Fenwei basin, China. We have examined different kinematic models that can fit the horizontal crustal deformation of the Fenwei basin using three steps of testing. The first step is to carry out unbiasedness and efficiency tests of various models. The second step is to conduct significance tests of strain parameters of the models. The third step is to examine whether strain parameters can fully represent the deformation characteristics of the 11 tectonic blocks over the Fenwei basin. Our results show that the degree of rigidity at the Ordos, Hetao, Yinshan and South China blocks is significant at the 95% confidence level, indicating the crustal deformation of these blocks can be represented by a rigid block model without the need to consider differential deformation within blocks. We have demonstrated that homogeneous strain condition is suitable for the Yinchuan basin but not for other 6 blocks. Therefore, inhomogeneous strains within blocks should be considered when establishing the crustal deformation model for these blocks. We have also tested that not all of the quadratic terms of strain parameters are needed for the Yuncheng-Linfen block. Therefore, four kinds of elastic kinematic models that can best represent the detailed deformation characteristics of the 11 blocks of Fenwei basin are finally obtained. Based on the established model, we have shown that the current tectonic strain feature of the Fenwei basin is mainly characterized by tensile strain in the NW-SE direction, and the boundaries betweem the Ganqing and Ordos blocks and the Shanxi graben possess the maximum shear strain. A comparison between our results and past geological and geophysical investigations further confirms that the model established in this paper is reasonable.
机译：利用中国地壳运动观测网1999-2007年的高精度GPS数据，我们建立了F渭盆地地壳形变的板块运动学模型。我们使用三个测试步骤，研究了可以适应the渭盆地水平地壳变形的不同运动学模型。第一步是对各种模型进行无偏性和效率测试。第二步是进行模型应变参数的显着性检验。第三步是研究应变参数是否可以完全代表the渭盆地11个构造块的变形特征。我们的结果表明，鄂尔多斯，河套，银山和华南地块的刚度在置信度为95％时很显着，这表明这些地壳的变形可以用刚性块模型来表示，而无需考虑微分形变。在块内。我们已经证明，均匀应变条件适用于银川盆地，但不适用于其他6个区块。因此，在建立这些块的地壳变形模型时，应考虑块内的不均匀应变。我们还测试了运城-临fen区块并不需要应变参数的所有二次项。因此，最终获得了四种可以最好地代表of渭盆地11个区块详细变形特征的弹性运动学模型。根据建立的模型，表明F渭盆地目前的构造应变特征主要表现为西北向东南方向的拉应变，甘青，鄂尔多斯区块和山西grab陷之间的边界具有最大的剪切应变。 。将我们的结果与过去的地质和地球物理研究进行比较，进一步证实了本文建立的模型是合理的。

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  • 来源
    《Journal of geodynamics》 |2014年第4期|1-8|共8页
  • 作者

    Wei Qu; Zhong Lu; Qin Zhang; Zhenhong Li; Jianbin Peng; Qingliang Wang; Jane Drummond; Ming Zhang;

  • 作者单位

    College of Geology Engineering and Geomatics, Chang'an University, Xian, Shaanxi, China;

    Department of Earth Sciences, Southern Methodist University, Dallas, TX, USA;

    College of Geology Engineering and Geomatics, Chang'an University, Xian, Shaanxi, China;

    School of Geographical and Earth Sciences, University of Glasgow, UK;

    College of Geology Engineering and Geomatics, Chang'an University, Xian, Shaanxi, China;

    Second Monitoring and Application Center, CEA, Xian, Shaanxi, China;

    School of Geographical and Earth Sciences, University of Glasgow, UK;

    College of Geology Engineering and Geomatics, Chang'an University, Xian, Shaanxi, China;

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  • 正文语种 eng
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  • 关键词

    Block kinematic models; Fenwei basin; GPS; Crustal deformation; Hypothesis testing;

    机译：块运动模型;wei渭盆地;全球定位系统;地壳变形;假设检验;

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