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ANALYSIS OF TIDAL DATA BEFORE WENCHUAN Ms8.0 EARTHQUAKE
汶川Ms8.0地震前的潮汐变化分析

Chen Zhiyao,Lu Pinji,Li Zhengyuan,Zhao Bin,Lin Suiping,
陈志遥
,吕品姬,李正媛,赵斌,林穗平

大地测量与地球动力学 , 2009,
Abstract: The data for 5 years observed at 9 fixed crustal deformation stations were used to calculate the tidal factor and phase delay series before the Wenchuan Ms8.0 earthquake.It is shown that at 7 stations there were abnomal changes before the earthquake.The nearer the station located to epicenteris,the greater of the abnormal signal.However the abnormal signal from the two stations were not obvious before the earthquak,one was Maoxian which is 100 km away from the earthquake and another was Kangding which is 20...
STUDY ON IONOSPHERIC TEC ANOMALY PRIOR TO WENCHUAN Ms8.0 EARTHQUAKE
汶川Ms8.0地震前电离层TEC异常分析

Zhu Fuying,Wu Yun,Lin Jian,Zhou Yiyan,Xiong Jing,Yang Jian,Institute of Seismology,CEA,Wuhan Crustal Movement Laboratory,Wuhan Rearch Center of Wuhan University,Wuhan,
祝芙英
,吴云,林剑,周义炎,熊晶,杨剑

大地测量与地球动力学 , 2008,
Abstract: An Ms8.0 earthquake struck Wenchuan in Sichuan province on May 12th 2008 and had resulted in severe damage.On the basis of the GPS observation data from the reference stations of Crustal Movement Observational Network of China,the continuous 31day TEC values over whole China were computed,examined and compared with two statistical analysis method,both the results showed that the ionospheric TEC anomaly did exist 1-6 days prior to the earthquake in the region,the apparent anomalous reduction of TEC occurred ...
CRUSTAL DEFORMATION MEASURED BY MOBILE OBSERVATION BEFORE WENCHUAN Ms8.0 EARTHQUAKE
汶川Ms8.0地震前的流动形变

Bo Wanju,Yang Guohua,
薄万举
,杨国华

大地测量与地球动力学 , 2008,
Abstract: 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180 mm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.
MECHANISM ANALYSIS OF VERTICAL UPLIFT OF CRUST IN THE WEST OF LONGMENSHAN BEFORE WENCHUAN Ms8.0 EARTHQUAKE
汶川地震震前龙门山以西地壳垂直隆升机理分析

Jiang Fengyun,Wang Qingliang,Zhu Liangyu,Zhang Xiaoliang,Wang Shuangxu,
蒋锋云
,王庆良,朱良玉,张晓亮,王双绪

大地测量与地球动力学 , 2011,
Abstract: The mechanism of the vertical uplift of crust in the west of Longmenshan before Wenchuan Ms8.0 earthquake has been debated through constructing the 2-D FEM model for the profile across Longmenshan fault,which is based on the velocity field that had calculated from the GPS observations and the result of seismic tomography obtained by Wu Jiangping et al.In addition,the effect of crustal inhomogeneity on the vertical uplift has been discussed as well.We concluded that the existence of the low velocity anomaly ...
GRAVITY DISTURBANCE BEFORE WENCHUAN Ms8.0 EARTHQUAKE
汶川大地震前的重力扰动

Hao Xiaoguang,Hu Xiaogang,Xu Houze,Zhong Min,Fang Jian,Hao Xinghua,Liu Min,Liu Genyou,Xue Huaiping,
郝晓光
,胡小刚,许厚泽,钟敏,方剑,郝兴华,刘明,刘根友,薛怀平

大地测量与地球动力学 , 2008,
Abstract: 继1997年5月采用LacosteET-21重力仪在中国南极中山站观测发现South of Kermadec Islands 7.1级地震前的"重力扰动"现象之后,2008年5月又在武汉大地测量国家野外科学观测站LacosteET-20重力仪的观测资料中发现了汶川大地震的"重力扰动"现象:从大震前两天开始,"重力扰动"逐渐增大、最大振幅约为±0.8×10-8ms-2,直到大震发生。由于这两次监测的时间不同、地点不同、仪器不同(ET-21与ET-20),这就使得监测结果的可靠性得到了加强。初步认识是:在某些强震发生前两天左右,往往会出现较明显的"重力扰动",其振幅在±(1~2)×10-8ms-2左右、信号周期4~8s。
PROBE INTO SEISMO-IONOSPHERIC ANOMALY OF WENCHUAN Ms8.0 EARTHQUAKE BASED ON COMPUTERIZED IONOSPHERIC TOMOGRAPHY
基于电离层层析成像技术探测汶川地震前电离层异常

Yang Jian,Wu Yun,Zhou Yiyan,
杨剑
,吴云,周义炎

大地测量与地球动力学 , 2011,
Abstract: The technology of Computerized Ionospheric Tomography was used to reconstruct the distribution of electron density on UT9:00 from May 8th to May 10th,2008 before Wenchuan Ms8.0 earthquake that occurred on May 12th.It is found that an ionospheric anomaly had taken place on May 9th,and the aspect about when and where this anomaly occurred is consistent with the conclusion made by VTEC analysis.After eliminating the possible impacts that space weather event existed in the ionosphere,we can undoubtedly maintain...
The characteristics of surface vertical deformation before the Wenchuan Ms8.0 earthquake from InSAR
汶川Ms 8.0地震前InSAR垂直形变场变化特征研究

SHAN Xin-Jian,SONG Xiao-Gang,HAN Yu-Fei,QU Chun-Yan,ZHANG Gui-Fang,ZHANG Guo-Hong,
单新建
,宋小刚,韩宇飞,屈春燕,张桂芳,张国宏

地球物理学报 , 2009,
Abstract: Using the D-InSAR technology, we have analyzed the Japanese satellite ALOS/PLASAR data before the 2008 Wenchuan earthquake and obtained four zones of ground deformation which cover the Yingxiu town, Maoxian county, Beichuan county, Pingwu and Qingchuan county in Sichuan Province. The result shows that before the Wenchuan event, the deformation field was a symmetric convex-shaped pattern around the fault. Vertical uplift appeared nearby the seismogenic fault, while subsidence took place far on its both sides away from the fault which increased in amplitude with increasing distance from the fault. Around Pingwu, Beichuan, Anxian and Jiangyou, a large area of uplift was present on the both sides of the fault with amplitude 5~10 cm. Nearby the Yingxiu town and the epicenter of the main shock, small scale spot-like swelling of 10~15 cm occurred separately, which coincides with the location of the epicenter as well as the most obvious rupture section. In the areas far away from the fault on both sides, there was dominantly subsidence, which was measured 0~-10 cm around Mianyang and Chengdu City and -5~-10 cm from Songpan to Wenxian, respectively. Our study indicates that along the locked thrust fault, vertical uplift is its primary characteristic before the quake. Although the derived deformation before the Wechchuan event from this work probably contains errors of 5 cm related with DEM and the atmospheric delay in the troposphere, such an abnormal change in the vertical deformation field indeed existed which can serve as a line of evidence for earthquake prediction.
ANALYSIS OF FAULT ACTIVITY CHARACTERISTICS IN SICHUAN-YUNNAN AREA BEFORE WENCHUAN Ms8.0 EARTHQUAKE
汶川地震前川滇地区断裂活动特征分析

Fan Guosheng,Jiao Qing,
范国胜
,焦 青

大地测量与地球动力学 , 2008,
Abstract: 利用川滇地区32处跨断层位移流动短水准、短基线20余年的观测资料,对该区主要活动构造在汶川地震前的活动特征进行了分析,结果表明:20世纪80年代以来主要活动构造多数呈继承性活动;汶川地震前,区域应力在2006年以来出现了持续2年左右的增强;鲜水河断裂带中南段、龙门山断裂带中南段受较强的北西-南东方向的压应力作用.
ANOMALOUS RESPONSE OF CRUST TILT TIDAL FACTOR γVALUE IN SHANXI BEFORE WENCHUAN Ms 8.0 EARTHQUAKE
汶川8级地震前陕西地倾斜γ值的异常反应

Ke Changan,Li Zhengyuan,Dou Mali,
柯昌安
,李正媛,窦玛丽

大地测量与地球动力学 , 2008,
Abstract: 对陕西省定点形变资料进行处理时发现,在汶川8级地震前形变资料出现异常现象:1)震前3个月,乾县、西安、宝鸡和汉中台的水平摆和水管仪资料,潮汐因子γ值明显增大;2)临震前1天,乾县和西安台的水管仪NS分量资料,出现畸变等.
ANALYSIS OF PERTURBATION PHENOMENA OF DEFORMATION DATA IN SHANXI PROVINCE
陕西形变资料扰动现象分析

Ke Chang'an,Li Zhengyuan,Dou Mali,Liu Chun,Li Jing,
柯昌安
,李正媛,窦玛丽,刘春,李晶

大地测量与地球动力学 , 2012,
Abstract: Through analyzing deformation data in Shanxi province,perturbations frequently appeared before M≥4 earthquake in range of 400 km or M≥5 earthquake in range of 500 km.It is shown in two aspects: 1)response of vertical pendulum in Hanzhong seismostation,water tube tiltmeter at Qianxian station and Xi’an station,vertical pendulum at Ningshan station to large aftershocks of Wenchuan Ms8.0 earthquake,2)response of vertical pendulum at Qianxian station to Hejing Ms4.8 earthquake.
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