| GPS时间序列及其对昆仑山口西 8.1级地震的响应 |
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| 引用本文： | 敬少群,吴云,乔学军,周硕愚,施顺英.GPS时间序列及其对昆仑山口西 8.1级地震的响应[J].地震学报,2005,27(4):394-401. |
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| 作者姓名： | 敬少群 吴云 乔学军 周硕愚 施顺英 |
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| 作者单位： | 中国武汉,430071,中国地震局地震研究所;中国长沙,410012,湖南省地震局;中国武汉,430071,中国地震局地震研究所 |
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| 基金项目： | 国家自然科学基金，国家科技攻关项目 |
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| 摘 要： | 采用GIPSY软件解算的站点坐标时间序列，对我国25个GPS基准站的观测数据进行了分析. 结果表明， 该时间序列存在明显的趋势变化，经向坐标与纬向坐标的趋势变化反映了各站点在全球板块中的运动； 垂直方向的趋势变化揭示的可能是大尺度的构造信息， 也可能是站点周围局部运动的反映. 分析还表明，该时间序列存在明显的近乎1年的年变周期，但具体原因还有待于进一步研究. 最后， 就该时间序列对昆仑山口西8.1级地震的响应进行了分析. 结果表明:GPS时间序列对该地震的孕育过程反映明显，并根据时间进程及异常特点将昆仑山口西8.1级地震的孕育过程分为3个阶段: 块体受力状态的变化、应力积累和能量的快速积累与缓慢释放. 在8.1级地震孕育的初始阶段和临震、同震及震后恢复阶段， 垂直方向的异常占据主导地位，初始阶段垂直方向的异常运动导致断层间闭锁； 而在地震孕育的中期，各块体间水平方向的差异运动则占主导地位，它是引起能量在断层闭锁段积累的重要原因.
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| 关 键 词： | GPS时间序列 趋势变化 周期变化 地震孕育 断层间闭锁 能量积累 |
| 文章编号： | 0253-3782(2005)04-0394-08 |
| 修稿时间： | 2003年12月17 |
GPS TIME-SERIES AND ITS RESPONSE TO Ms =8.1 KUNLUNSHAN EARTHQUAKE |
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| Jing Shaoqun,Wu Yun,Qiao Xuejun,Zhou Shuoyu,Shi Shunying.GPS TIME-SERIES AND ITS RESPONSE TO Ms =8.1 KUNLUNSHAN EARTHQUAKE[J].Acta Seismologica Sinica,2005,27(4):394-401. |
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| Authors: | Jing Shaoqun Wu Yun Qiao Xuejun Zhou Shuoyu Shi Shunying |
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| Abstract: | In this paper, observation data in 25 GPS reference stations of China have been analyzed by calculating GPS position coordinate time-series with GIPSY. Result shows there is an obvious trend variation in such time-series. The trend variations of time series along the longitudinal and latitudinal coordinates reflect the motion of each position in the global-plate, in which the trend variation in the vertical direction reveals some large-scale construction information or reflects the local movement around the positions. The analysis also shows that such time-series have a variation cycle of nearly 1.02 year, but the reason still remains to be further studied. At the end of this paper, response of the time-series to M_S=8.1 Kunlunshan earthquake was analyzed, and the earthquake preparation of M_S= 8.1 Kunlunshan earthquake, according to the time proceeding and the feature of anomaly, was divided into 3 phases-forces change exerted on blocks, strain accumulation, quick accumulation and slow release of energy. At the initial stage of seismogenic process of M_S=8.1 earthquake and at the imminent earthquake, coseismic process as well as during the post earthquake recovery, anomaly in vertical direction is always in a majority. The anomalous movement in vertical direction at the initial stage resulted in a blocking between faults, while at the middle stage of seismogenic process, the differential movement between blocks are in a majority, which is the major reason causing energy accumulating at the blocking stage of faults. |
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| Keywords: | GPS time-series trend variation periodic variation earthquake preparation blocking between faults energy accumulation |
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