| THE LATERAL INHOMOGENEITY IN YUNNAN PROVINCE, CHINA |
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| 作者姓名： | 陈培善 刘福田 李强 秦嘉政 |
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| 作者单位： | Institute of Geophysics，State Seismological Bureau，Beijing 100081，PRC，Institute of Geophysics，Academia Sinica，Beijing 100083，PRC，Institute of Geophysics，State Seismological Bureau，Beijing 100081，PRC，Seismological Bureau of Yunnan Province，Kunming 650011，PRC |
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| 基金项目： | Project supported by the Seismological Joint Foundation. |
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| 摘 要： | Images of the velocity cross--section at 10 different depths in Yunnan Province have been suc-cessfully reconstructed, using the principle and method of seismic tomography (ST). These velocitycoss-sections are consistent with the results of six velocity profiles of deep seismic sounding. The reconstruction method of ST used in this paper has two advantages: (i) The velocity modeli determined by spe cifying node--velocities of hexahedron and linear interpolation through knownbasic function. A velocity field with lateral continuous velocity value and vertical discontinuitiesis established. This model is obviously better than the block model of constant velocity. The verticaldiscontinuities allow the model to simulate velocity discontinuities in the crust and upper mantle. (ii)The velocity and hypocenter parameters are separated by introducing an orthogonal projection oper-ator. Sequential orthogonal triangularization and modified singular decomposition are adopted.These measures reduce the RAM requirement
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THE LATERAL INHOMOGENEITY IN YUNNAN PROVINCE, CHINA |
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| CHEN PEI-SHAN,LIU FU-TIAN,LI QIANG,QIN JIA-ZHENG Institute of Geophysics,State Seismological Bureau,Beijing ,PRC Institute of Geophysics,Academia Sinica,Beijing ,PRC Institute of Geophysics,State Seismological Bureau,Beijing ,PRC Seismological Bureau of Yunnan Province,Kunming ,PRC.THE LATERAL INHOMOGENEITY IN YUNNAN PROVINCE, CHINA[J].Science in China(Chemistry),1991(5). |
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| Authors: | CHEN PEI-SHAN LIU FU-TIAN LI QIANG QIN JIA-ZHENG Institute of Geophysics State Seismological Bureau Beijing PRC Institute of Geophysics Academia Sinica Beijing PRC Institute of Geophysics State Seismological Bureau Beijing PRC Seismological Bureau of Yunnan Province Kunming PRC |
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| Institution: | CHEN PEI-SHAN,LIU FU-TIAN,LI QIANG,QIN JIA-ZHENG Institute of Geophysics,State Seismological Bureau,Beijing 100081,PRC Institute of Geophysics,Academia Sinica,Beijing 100083,PRC Institute of Geophysics,State Seismological Bureau,Beijing 100081,PRC Seismological Bureau of Yunnan Province,Kunming 650011,PRC |
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| Abstract: | Images of the velocity cross--section at 10 different depths in Yunnan Province have been suc-
cessfully reconstructed, using the principle and method of seismic tomography (ST). These velocity
coss-sections are consistent with the results of six velocity profiles of deep seismic sounding.
The reconstruction method of ST used in this paper has two advantages: (i) The velocity model
i determined by spe cifying node--velocities of hexahedron and linear interpolation through known
basic function. A velocity field with lateral continuous velocity value and vertical discontinuities
is established. This model is obviously better than the block model of constant velocity. The vertical
discontinuities allow the model to simulate velocity discontinuities in the crust and upper mantle. (ii)
The velocity and hypocenter parameters are separated by introducing an orthogonal projection oper-
ator. Sequential orthogonal triangularization and modified singular decomposition are adopted.
These measures reduce the RAM requirement by one order of magnitude and reduce the amount of
computation to a half. |
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| Keywords: | imaging of seismic tomography lateral inhomogeneity Yunnan region reconstruction of velocity image resolution matrix |
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