The GPS vertical component is more sensitive to the surface loading, while the horizontal components may be controlled mostly by tectonic processes. In this work, we would like to derive the groundwater distribution through GPS vertical displacement in the North China craton, Gansu and Shaanxi provinces in particular. Firstly, we select continuous and campaign-mode GPS stations in these regions. Then, we process the GPS vertical data and remove effects of processes other than the groundwater change. In the end, we invert the corrected GPS data for the groundwater distribution based on the elastic loading theory. Research members: Siyuan Yang, Dr. Yan Hu
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In this project, we aim to better constrain the rheological structure and properties of the southern section of the Longmen Shan fault system, and to better understand the short-term deformation processes of medium-size (Mw7) earthquakes. First, we derive the coseismic and postseismic displacements from continuous and campaign-mode GPS network for the 20 April 2013 Ms 7.0 Lushan earthquake. Then, we constructed a three-dimensional viscoelastic finite element model according based on previously published co-seismic slip model of the Lushan earthquake, tomographic images of the Sichuan basin and the eastern margin of the Tibetan plateau. Finally, we used the elastic and vis
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The rupture of the 2016 Kumamoto earthquake initiated on the Futagawa–Hinagu fault zone and terminated near the Aso volcano on the Kyushu island. This earthquake provides a good opportunity to investigate the rheology structure in this volcano-active area. In this study, we constructed an adequate finite element model (FEM), which involves the subducted Philippine slab and a well constrained volcanic zone, to simulate the 5-year postseismic process of this earthquake. Research members: Yiqing Liu, Dr. Yan Hu.
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