| 芦山地震同震和震后地表形变及重力变化的理论模拟 |
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| 引用本文： | 邓明莉,孙和平,徐建桥,祝意青.芦山地震同震和震后地表形变及重力变化的理论模拟[J].地球科学,2014,39(9):1373-1382. |
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| 作者姓名： | 邓明莉 孙和平 徐建桥 祝意青 |
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| 作者单位： | 1.中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室, 湖北武汉 430077 |
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| 基金项目： | 国家自然科学基金项目(Nos．41021003，41074053)；中国科学院重点项目(No．KZCX2-YW-133)． |
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| 摘 要： | 为了研究芦山地震的孕震过程和震源区的长期构造过程以及解释实测的震后形变和重力资料, 采用分层介质模型, 利用数值模拟的方法, 考虑区域流变系数, 计算了地震引起的地表同震、震后的形变和重力变化以及区域内部分GPS与重力连续观测台站的震后形变和重力变化的时间序列.结果表明: 芦山地震的地表同震形变显示出发震断层明显的逆冲特性; 粘弹性松弛效应引起的震后地表形变和重力变化比同震形变和重力变化的范围明显扩大, 但随着粘滞系数的增加, 变化量明显减小; 观测台站的震后变化时变曲线显示震后形变和重力变化在震后50 a间变化显著, 100 a后基本平缓, 趋于稳定; 模拟计算的GPS台站中除了MEIG台和MYAN台以外, 其余台站的震后观测必须考虑粘弹性松弛的影响.
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| 关 键 词： | 芦山地震 地表形变 重力变化 粘弹性松弛 地球物理 |
| 收稿时间： | 2014-01-05 |
Theoretical Simulation of Co-Seismic and Post-Seismic Deformations and Gravity Changes of Lushan Earthquake |
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| Deng Mingli,Sun Heping,Xu Jianqiao,Zhu Yiqing.Theoretical Simulation of Co-Seismic and Post-Seismic Deformations and Gravity Changes of Lushan Earthquake[J].Earth Science-Journal of China University of Geosciences,2014,39(9):1373-1382. |
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| Authors: | Deng Mingli Sun Heping Xu Jianqiao Zhu Yiqing |
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| Abstract: | This paper aims at studying the seismogenic process and long-term tectonic process of the source area and explain the post-seismic deformation and gravity data in Lushan earthquake. Based on the layered half-space model, we calculate the co- and post-seismic surface deformations and gravity changes and their time series gained by the GPS and gravity stations, considering regional rheological coefficients, and using the numerical simulation method. It is found that the surface co-seismic deformation shows seismogenic fault is of obvious thrusting characteristics The range of influence of viscoelastic relaxation is significantly enlarged than that of the co-seismic, but changes gradually reduce with the increase of viscousity coefficients. The time-variable curves of the stations show that post-seismic deformation and gravity changes are significant in 50 years after the earthquake, become gentle after 100 years and tend to be stable. The post-seismic observations of the GPS stations are convinced to consider the effect of viscoelastic relaxation except for the MEIG and the MYAN. |
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| Keywords: | Lushan earthquake ground deformation gravity change viscoelastic relaxation geophysics |
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