HR: 11:30h
AN: T22D-05    [Abstracts]
TI: Seismic array observations at the boundary of Ordos plateau, North China
AU: * Chen, Y J
EM: johnyc@pku.edu.cn
AF: Peking University, Department of Geophysics School of Earth and Space Sciences, Beijing, 100871, China
AU: Zhou, S
EM: zsy@pku.edu.cn
AF: Peking University, Department of Geophysics School of Earth and Space Sciences, Beijing, 100871, China
AU: Ning, J
EM: njy@pku.edu.cn
AF: Peking University, Department of Geophysics School of Earth and Space Sciences, Beijing, 100871, China
AU: Feng, Y
EM: fengyg@263.net
AF: Peking University, Department of Geophysics School of Earth and Space Sciences, Beijing, 100871, China
AU: Tang, Y
EM: tgyc003@163.com
AF: Peking University, Department of Geophysics School of Earth and Space Sciences, Beijing, 100871, China
AU: Jin, G
EM: jinwar@sina.com
AF: Peking University, Department of Geophysics School of Earth and Space Sciences, Beijing, 100871, China
AU: Fu, Y
EM: cugfyy@163.com
AF: Peking University, Department of Geophysics School of Earth and Space Sciences, Beijing, 100871, China
AU: Sandvol, E
EM: SandvolE@missouri.edu
AF: University of Missouri, Dept. of Geological Sciences, Columbia, MO 65211, United States
AU: Liu, M
EM: lium@missouri.edu
AF: University of Missouri, Dept. of Geological Sciences, Columbia, MO 65211, United States
AB: Since September 2005, three temporary seismic linear arrays consisting of total 49 portable seismic stations were deployed across the boundary of the Ordos plateau at three locations with different time periods to image the crustal and upper mantle structure of the seismically active fault zones that bound the Ordos plateau, which is a relatively stable block in North China. These arrays were conducted as a pilot study by Peking University for the implementation of the ¡°Integrated Seismic Arrays¡±, which is a major observational program of a new research initiative, ¡°Destruction of North China craton¡±, recently funded by the Chinese NSF. Preliminary results from over one-year observations at these arrays show that the faults, which form the Weihe graben and Sanxi graben at the boundary of the Ordos plateau, cut through the Moho indicating that these are lithospheric faults. Deformation at the upper mantle correlates to the deformation at the surface through these deep-cutting faults. Relatively uniform fast directions across these boundary faults from shear-wave splitting analyses and their agreement with the surface deformation directions inferred from both GPS data and observations of Quaternary fault slip rate imply strong crust-mantle coupling at Ordos plateau and its adjacent regions.
DE: 7218 Lithosphere (1236)
DE: 8103 Continental cratons
DE: 8120 Dynamics of lithosphere and mantle: general (1213)
DE: 8178 Tectonics and magmatism
SC: Tectonophysics [T]
MN: 2007 Fall Meeting