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Recent crustal movement and great earthquakes in Qinghai-Tibet sub-plate

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Geodesy and Geodynamics 2011年第3期2卷 50-55页

作者： Guo Liangqian bo wanju Yang Guohua Chen Juzhong Guo He First Crust Monitoring and Application Center China Earthquake Administration Tianjin 300180 China

Crustal movement and incremental-movement data observed repeatedly at GPS stations during 1999 -2009 were analyzed to study the effect of two earthquakes of Ms8.1 and Ms8.0 that occurred in 2001 and 2008, respectively, in Qinghai-Tibet sub-plate and its eastern margin. The result revealed certain anoma- lous pre-earthquake deformation and some large co-seismic changes. Prior to the 2008 Wcnchuan Ms8.0 earthquake, the seismogenic Kunlunshan fault zone became a geographic boundary between different regional movements. At the time of the earthquake, there was an average cross-fault crustal shortening of - 1.04 m and an average right-lateral strike slip of 0.76 m along the ruptured segment, as well as a strain-energy release of -62.66 ×10.7.

关键词： Qinghai-Tibet sub-plate' s movement field tectonic activity movement incremental field earth-quake deformation strain energy Wenchuan earthquake

Preparatory mechanism of Ms8.0 Wenchuan earthquake evidenced by crust-deformation data

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Geodesy and Geodynamics 2011年第2期2卷 23-28页

作者： bo wanju Yang Guohua Zhan Wei Zhang Fengshuang Wan Wenni Zhang Licheng First Crust Monitoring and Application Center Tiaajin 300180 China

Some crustal-deformation data related to the Ms8.0 Wenchuan in 2008, was described and a model that is capable of explaining the observed deformation features is presented. The data include ： pre-earthquake uplift in an area south of the epicenter obtained by repeated-leveling measurements ; pre-earthquake horizontal deformation by GPS observation during two periods in Sichuan-Yunnan area;vertical deformation along a short cross-fault leveling line in the epicenter area; and co-seismic near-field vertical and horizontal crustal-move- ment data by GPS. The model is basically ＂elastic-rebound＂, but involves a zone between two local faults that was squeezed out at the time of earthquake. ：

关键词： Wenchuan Ms8.0 earthquake earthquake generation mechanism deformation leveling GPS

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形变异常与干扰关系的再认识

大地测量与地球动力学 2010年第1期30卷 5-8,26页

作者：薄万举中国地震局第一监测中心天津300180

对7次巨幅形变异常事件研究后认为:1)巨幅形变事件是指与其自身本底变化幅度相比相差悬殊的形变事件,如半年至一年的变化幅度,超过前3年内最大变幅的4倍,即可将此判定为巨幅形变事件;2)形变异常与干扰共存;3)形变与干扰一般情况下难以... 详细信息

对7次巨幅形变异常事件研究后认为:1)巨幅形变事件是指与其自身本底变化幅度相比相差悬殊的形变事件,如半年至一年的变化幅度,超过前3年内最大变幅的4倍,即可将此判定为巨幅形变事件;2)形变异常与干扰共存;3)形变与干扰一般情况下难以区分和识别,但巨幅形变事件不是一般干扰单独引起的,出现巨幅形变事件,应首先考虑是否属于近区域、中短期的强震的前兆异常;4)对于强震,近区域中短期应存在超大幅度的地壳形变,监测巨幅形变异常对地震预报意义重要。

关键词：形变异常干扰强震断层形变非线性动力学

The Application of GNSS to Fault Deformation Studies

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Earthquake Research in China 2014年第4期28卷 510-519页

作者： bo wanju Feng Shengtao Su Jianfeng Zhou Haitao Du Xuesong Wan Wenni Liu Tianhai The First Crustal Deformation Monitoring and Application Center CEA National Earthquake Response Support Service

Great earthquakes often occur along or near active fault belts. Thus,monitoring and research on fault deformation are quite important. Methods such as short-leveling,shortbaseline and integrated monitoring profile across fault belts have been used to monitor fault activities for many years. GNSS observations are mainly used to obtain the horizontal velocity field in large areas and to study the activities and deformation of major *** technology has been used to monitor and study the deformation of faults from a different aspects. In this paper,some applications and new explorations of GNSS are discussed. They are:( 1) Research and monitoring of strike-slip activities of faults with GNSS.( 2) Research and monitoring of vertical activities of faults with GNSS.( 3)Investigating the laws of deformation of blocks on the sides of fault zone and setting up strain models to deduce the activities and deformation of faults with respective models and compare the deduced results with the actual measurements across fault. It is concluded that a larger discrepancy between the deduced and the observed deformation indicates a stronger interaction between the blocks,which can be important for predicting the location of a strong earthquake and assessing seismic hazard,as well as the seismicity trend.

关键词： GNSS Fault deformation Baseline Leveling Seismicity Crust block

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地震水准测量成果中几项改正的讨论

大地测量与地球动力学 2011年第3期31卷 34-37,41页

作者：薄万举陈聚忠中国地震局第一监测中心天津300180

依据国家一、二等水准测量规范(GB/T 12987-2006),分别给出了水准测量中标尺温度改正、正常水准面不平行改正、重力异常改正、固体潮改正和海潮负荷影响等改正的计算公式和方法,并对地震形变分析计算中进行各项改正的必要性进行了讨论... 详细信息

依据国家一、二等水准测量规范(GB/T 12987-2006),分别给出了水准测量中标尺温度改正、正常水准面不平行改正、重力异常改正、固体潮改正和海潮负荷影响等改正的计算公式和方法,并对地震形变分析计算中进行各项改正的必要性进行了讨论。强调:在形变分析计算中,是否进行某一项改正,新老成果必须保持一致;老成果没有进行改正,新成果中没有必要也不应该进行改正,否则可能造成更大的不合理;出于科学研究和测量数据多样化用途的考虑,认为在地震水准测量中各项改正所需要的辅助观测量应该完整地保存下来。

关键词：水准测量温度改正固体潮重力异常海潮负荷

Vertical deformation and tectonic activity in Tianjin area

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Geodesy and Geodynamics 2010年第1期1卷 42-47页

作者： Liangqian Guo wanju bo Yukun Chen Lanyu Yao La Ta Haitao Zhou He Guo First Crust Monitoring and Application Center China Earthquake Administration Tianfin 300180 China Earthquake Administration of Tianfin Municipality Tianjin 300207 China

Vertical deformation in Tianjin area during 1992 -2008 was calculated from leveling data. The effect of large surface subsidence caused by extensive groundwater pumping was removed by fitting the data along each survey line with a polynomial function. The results are fitted with crustal blocks individually in this area. Vertical deformation rates are mapped, vertical rates of the main fault zones were calculated, and the activities of the blocks and fault zones were investigated. The observed vertical deformation shows that some of the blocks tilted and some blocks rose or subsided as a whole. The vertical rates at fault zones in the area vary within the range of 0. 13-0. 48 mm/a,with an average value of 0.29 mm/a.

关键词： level data ground subsidence crustal vertical deformation block motion vertical velocity of fault zone

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地球自转、断层形变与地震活动关系研究

大地测量与地球动力学 2006年第2期26卷 43-47页

作者：薄万举王广余中国地震局第一监测中心天津300180 中国地震应急搜救中心北京100039

对地球自转、断层形变和地震活动三者各自的活动性规律进行了比较,对三者之间的相关性进行了分析,得出了几点新的认识1)地球自转速度变化与地壳形变相关,近30年来存在准10年周期的变化,但相关成分在总的形变信息中比重很小,呈弱相关;2)... 详细信息

对地球自转、断层形变和地震活动三者各自的活动性规律进行了比较,对三者之间的相关性进行了分析,得出了几点新的认识1)地球自转速度变化与地壳形变相关,近30年来存在准10年周期的变化,但相关成分在总的形变信息中比重很小,呈弱相关;2)地球自转速度变慢、日长变长、华北地震活跃,据此认为目前华北处于非强震活动期;3)强震中短期前兆在形变资料中有较好的显示,但在地球自转资料中不会出现特定地震的中短期前兆异常;4)地球自转速度变化与地壳形变可能是同源关系,而不是从属关系,有互补性;5)华北最近的两个地震活动高潮期与地球自转变化的10年以上周期相关,认为地震活动与地球自转变化有关系,但不同区域会有不同的对应关系。同样是地球自转速度变慢,因不同区域地壳与地幔的耦合关系不一样,速度变化对不同区域地壳活动的影响也不同。

关键词：地球自转断层形变地震活动中长期预测相关性

A Preliminary Research on the Application of GPS to Regional Crustal Movement and Judgement of Seismic Risk Region

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Earthquake Research in China 1998年第3期12卷 49-56页

作者： Yang Guohua, Li Yanxing, bo wanju, and Han YuepingThe First Crustal Deformation Monitoring Center, China Seismological Bureau, Tianjin 300180, China

We analyzed the present state of crustal horizontal movement in part of the North China region using existing GPS re-observation data (1992-1995) and drew the following conclusions: (1) The monitored region appears to be in tensile movement, with the trend of the principal tensile strain in the WNW-ESE direction; (2) There are two zones of higher maximum shear strain in the monitored region, namely, the Beijing zone and two sides of the Tancheng-Lujiang fault near Linyi; (3) There exists a striped compressive zone which stretches in the NNE-SSW direction; the zone of maximum planar compression is located in the Beijing zone; (4) The displacement field has an obvious zoned distribution.

关键词： GPS survey North China region Crustal horizontal movement Earthquake.

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汶川Ms8.0地震前的流动形变

大地测量与地球动力学 2008年第6期28卷 11-15页

作者：薄万举杨国华中国地震局第一监测中心天津300180

分析汶川Ms8.0大震前南北地震带流动水准和流动GPS观测到的形变图像发现:1)流动水准显示汶川地震之前该区域存在一个相对隆起区,量级在180mm以上;2)流动GPS显示该区域存在长期显著的压性变形,与隆起变形相配套;3)汶川大震前没有任何察... 详细信息

分析汶川Ms8.0大震前南北地震带流动水准和流动GPS观测到的形变图像发现:1)流动水准显示汶川地震之前该区域存在一个相对隆起区,量级在180mm以上;2)流动GPS显示该区域存在长期显著的压性变形,与隆起变形相配套;3)汶川大震前没有任何察觉的主要原因:一是孕震区缺少足够的观测手段,难以捕捉到可信的前兆信息,二是缺少8级逆冲型地震的震例和经验。

关键词：汶川地震流动形变监测前兆预测隆起