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Distribution Characteristics of the Seismicity of zipingpu reservoir Region after the Wenchuan Earthquake

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Earthquake Research in China 2011年第3期25卷 293-299页

作者： Li Hai＇ou Ma Wentao Xu Xiwei Xie Ronghua Yuan Jingli Xu Changpeng Institute of Geology China Earthquake Administration Beijing 100029 China Earthquake Administration of Sichuan Province Chengdu 610041 China

815 earthquakes recorded by 12 seismic stations of the zipingpu reservoir seismic network in 2009 were relocated using the double difference algorithm to analyze the seismic activity of the zipingpu *** results show that the earthquakes are concentrated relatively in three *** distribution characteristics of focal depth are obviously different among different concentration *** means earthquakes in different concentration zones may have different *** to relocation of earthquakes taking place before the Wenchuan earthquake done by other researchers,the seismic concentration zones in the reservoir area shifted obviously after the Wenchuan *** variations are related to local stress adjustment in the reservoir area and may also be related to the diffusion depth and range of increased pore pressure caused by rock failure in the course of Wenchuan earthquake.

关键词： Wenchuan earthquake zipingpu reservoir Double-difference algorithm Pore pressure diffusion

Research on Seismicity and Source Parameters of Small Earthquakes in the zipingpu reservoir before the Wenchuan M_S 8. 0 Earthquake

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Earthquake Research in China 2010年第3期24卷 292-303页

作者： Zhang Zhiwei Cheng Wanzheng Zhang Yongjiu Xie Ronghua Fu Ying Earthquake Administration of Siehuan Province Chengdu 610041 China

Based on the digital seismic waveform data observed from regional and reservoir seismic networks,the seismicity and source parameters in the zipingpu reservoir area from January 1,2000 to May 11,2008 before the Wenchuan MS8.0 earthquake are studied. The analysis shows a continuous activity of small earthquakes before the Wenchuan MS8. 0 earthquake. The level of seismic activity was from ML2.0 to ML3.0 in recent years. The impoundment of zipingpu reservoir started in September 2005 and the obvious increment of seismic activities occurred in February 2008,but according to the analysis of the longer time series,the frequency and intensity of seismic activities do not exceed its range,which means it is still a fluctuation of regional seismic activities or tectonic activity. At the same time,we also studied the spatio-temporal distribution and the change of apparent stress difference in the source region before the great earthquake,and the results show that the apparent stress values of small earthquakes are generally higher than fitted values of apparent stress in the reservoir area in the nearly three months before the Wenchuan MS8.0 earthquake. It can be seen from the spatial distribution of apparent stress difference,that the epicenter of the earthquake is located at a low stress distribution area,and the relatively high apparent stress difference is at the east of the epicenter. Apparent stress increment occurred in local areas.

关键词： reservoir-induced earthquake activity zipingpu reservoir Sourceparameters Apparent stress

Correlation of reservoir and earthquake by fluid flow driven pore-network crack model under Parallel CPU and GPU platform:zipingpu reservoir and 2008 Wenchuan Ms 8.0 earthquake

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Correlation of reservoir and earthquake by fluid flow driven...

The Focal Mechanism and Characteristic of Stress Field in the zipingpu Area before the M_S8.0 Wenchuan Earthquake

中国计算力学大会'2010（CCCM2010）暨第八届南方计算力学学术会议（SCCM8）

作者： B.J.Zhu1,C.Liu1,2,Y.L.Shi 1 Laboratory of Computational Geodynamics,College of Earth Science,Graduate University of Chinese Academy of Sciences Beijing 100049 P.R.China Laboratoire De Geologie,Ecole Normale Supérieure,24 Rue Lhomond,75231 Paris CEDEX 5,France

Coulomb failure assumptions is used to evaluate the earthquake trigger,and pore pressure parts reflect the effect of reservoir which closed to the earthquake *** flow driven pore-network crack model is use to study the reservoir and *** on the parallel CPU computation and GPU visualization technology,the relationship between the water-drainage sluice process of the zipingpu reservoir,stress triggers and shadows of 2008 Wenchuan Ms 8.0 earthquake and porosity variability of Longmenshan slip zone have been analyzed and the flow-solid coupled facture mechanism of Longmenshan coseismic fault slip is obtained.

关键词： zipingpu reservoir 2008 Wenchuan earthquake Coulomb failure stress diffusion Pore stress diffusion Fluid flow driven pore-network crack model

来源： cnki会议评论

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Earthquake Research in China 2011年第2期25卷 227-239页

作者： Zhang Yongjiu Zhang Zhiwei Earthquake Administration of Sichuan Province Chengdu 610041 China

Based on seismic wave records of the Chengdu digital seismic network and zipingpu reservoir digital seismic network from August 16,2004 to May 12,2008 when the Wenchuan MS8.0 earthquake occurred,the parameters of focal mechanisms of 486 earthquakes with magnitude larger than M1.6 in the zipingpu reservoir area were calculated using amplitude ratio method,meanwhile the temporal-spatial variation characteristics of mechanisms and stress field were analyzed based on these *** show a low ratio of thrust earthquakes and an increased number of strike-slip earthquakes in the reservoir water area in the period from 2006 to *** in the areas far from the reservoir waterfront,the thrust earthquakes took up a high proportion and the strike-slip ones did not *** direction of mean principal compressive stress field was deflected and disturbed differently in each area before the Wenchuan MS8.0 earthquake.

关键词： zipingpu reservoir Wenchuan earthquake Focal mechanism Stress field