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| 1 | Co-seismic Faults and Geological Hazards and Incidence of Active Fault of Wenchuan Ms 8.0 Earthquake,Sichuan,China显示文摘There are two co-seismic faults which developed when the Wenchuan earthquake happened. One occurred along the active fault zone in the central Longmen Mts.and the other in the front of Longmen Mts.The length of which is more than 270 km and about 80 km respectively.The co-seismic fault shows a reverse flexure belt with strike of N45°-60°E in the ground,which caused uplift at its northwest side and subsidence at the southeast.The fault face dips to the northwest with a dip angle ranging from 50°to 60°.The vertical offset of the co-seismic fault ranges 2.5-3.0 m along the Yingxiu-Beichuan co-seismic fault,and 1.5-1.1 m along the Doujiangyan-Hanwang fault.Movement of the coseismic fault presents obvious segmented features along the active fault zone in central Longmen Mts. For instance,in the section from Yingxiu to Leigu town,thrust without evident slip occurred;while from Beichuan to Qingchuan,thrust and dextral strike-slip take place.Main movement along the front Longmen Mts.shows thrust without slip and segmented features.The area of earthquake intensity more thanⅨdegree and the distribution of secondary geological hazards occurred along the hanging wall of co-seismic faults,and were consistent with the area of aftershock,and its width is less than 40km from co-seismic faults in the hanging wall.The secondary geological hazards,collapses,landslides, debris flows et al.,concentrated in the hanging wall of co-seismic fault within 0-20 km from co-seismic fault. | MA Yinsheng LONG Changxing TAN Chengxuan WANG Tao GONG Mingquan LIAO Chunting WU Manlu SHI Wei DU Jianjun PAN Feng | 2009 | Acta Geologica Sinica(English Edition)2009，83，4： | 7 |
| 2 | Crustal Stress State and Seismic Hazard along Southwest Segment of the Longmenshan Thrust Belt after Wenchuan Earthquake显示文摘The crustal stress and seismic hazard estimation along the southwest segment of the Longmenshan thrust belt after the Wenchuan Earthquake was conducted by hydraulic fracturing for in-situ stress measurements in four boreholes at the Ridi, Wasigou, Dahegou, and Baoxing sites in 2003, 2008, and 2010. The data reveals relatively high crustal stresses in the Kangding region(Ridi, Wasigou, and Dahegou sites) before and after the Wenchuan Earthquake, while the stresses were relatively low in the short time after the earthquake. The crustal stress in the southwest of the Longmenshan thrust belt, especially in the Kangding region, may not have been totally released during the earthquake, and has since increased. Furthermore, the Coulomb failure criterion and Byerlee's law are adopted to analyzed in-situ stress data and its implications for fault activity along the southwest segment. The magnitudes of in-situ stresses are still close to or exceed the expected lower bound for fault activity, revealing that the studied region is likely to be active in the future. From the conclusions drawn from our and other methods, the southwest segment of the Longmenshan thrust belt, especially the Baoxing region, may present a future seismic hazard. | Xianghui Qin Chengxuan Tan Qunce Chen Manlu Wu Chengjun Feng | 2014 | Journal of Earth Science2014，25，4： | 2 |
| 3 | Numerical modeling estimation of the ‘tectonic stress plane (TSP)’ beneath topography with quasi-U-shaped valleys显示文摘 | Tan Chengxuan Wang Ruijiang Sun Ye | 2004 | International Journal of Rock Mechanics and Mining Sciences2004，41，2： | 1 |
| 4 | An approach to the present-day three dimensional stress field and it's application to hydrocarbon migration and accumulation in the Zhangqiang depression, Liaohe field, China显示文摘 | Tan Chengxuan Jin Zhijun Zhang Mingli | 2001 | Marine and Petroleum Geology2001，18，9： | 1 |
| 5 | Numerical modeling estimation of the 'tectonic stress plane (TSP)' beneath topography with quasi-U-shaped valleys 显示文摘 | Tan Chengxuan Wang Ruijiang Sun Ye | 2004 | International Journal of Rock Mechanics and Mining Sciences2004，41，2： | 1 |
| 6 | An approach to the present day three-dimensional(3-D)stress field and its application to hydrocarbon migration and ac- cumulation in the Zhangqiang Depression, Liaohe Field 显示文摘 | TAN Chengxuan JIN Zhijun ZHANG Mingli | 2001 | China Marine and Petroleum Geology2001，18，9： | 1 |
| 7 | An approach to the present-day three dimensional (3D) stress field and it's application to hydrocarbon migration and accumulation in the Zhangqiang depression,Liaohe field,China显示文摘 | Tan Chengxuan Jin Zhijun Zhang Mingli | 2001 | Marine and Petroleum Geology2001，18，9： | 1 |
| 8 | Investigations and assessment of the landslide hazards of Fengdu county in the reservoir region of the Three Gorges project on the Yangtze River显示文摘 | Shuren Wu Yimin Jin Yongshuang Zhang Jusong Shi Chen Dong Weizhi Lei Ling Shi Chengxuan Tan Daogong Hu | 2004 | Environmental Geology2004，，4： | 1 |
| 9 | Assessment and zonation of regional crustal stability in and around the dam region of the Three Gorges Project on the Yangtze River 显示文摘 | Tan Chengxuan Sun Ye Wang Ruijiang | 1997 | Environmental Geology1997，32，4： | 1 |
| 10 | An approach to the present-day three-dimensional (3-D) stress field and its application to hydrocarbon migration and accumulation in the Zhangqiang depression, Lioahe field, China显示文摘 | Tan Chengxuan Jin Zhijun Zhang Mingli | 2001 | Marine and Petroleum Geology2001，18，9： | 1 |
| 11 | Assessment and zonation of regional crustal stability in and around the dam region of the Three Gorges Project on the Yangtze River显示文摘 | Sun Ye Wang Ruijiang | 1997 | Environmental Geology1997，32，4： | 1 |
| 12 | Research on loess-paleosol engineering geology features from the borehole cores of a typical section in Baoji area, Shaanxi province, China显示文摘 | Tan Chengxuan Sun Weifeng Meng Jing Zhang Chunshan Wu Shuren Shi Jusong Li Bin Wang Tao | 2015 | Environmental Earth Scineces2015，74，5： | 1 |
| 13 | Numerical modeling estimation of the 'tectonic stress plane' (TSP) beneath topography with quasi-U-shaped valleys显示文摘 | Tan Chengxuan Wang Ruijiang Sun Ye | 2003 | International Journal of Rock Mechanics and Mining Sciences2003，40，6： | 1 |
| 14 | Numerical modeling estimation of the 'tectonic stress plane'(TSP) beneath topography with quasi-U-shaped valleys显示文摘 | Wang Ruijing Sun Ye | 2004 | International Journal of Rock Mechanics and Mining Science2004，41，3： | 1 |
| 15 | An approach to present-day three-dimensional(3D) stress field application in hydrocarbon migration and accumulation from the Zhangqiang depression, Liaohe field, China显示文摘 | Tan Chengxuan Jin Zhijun Zhang Mingli | 2001 | Marine and Petroleum Geology2001，18，9： | 1 |
| 16 | An approach to the present-day three dimensional (3D) stress field and it's appli- cation to hydrocarbon migration and accumulation in the Zhangq- iang depression, Liaohe field, China显示文摘 | Tan Chengxuan Jin Zhijun Zhang Mingli | 2001 | Marine and Petroleum Ge- ology2001，18，9： | 1 |
| 17 | Quantitative assess- ment and zonation of regional crustal stability in the dam region of the Three Gorges Project on the Yangtze River and its vicinity显示文摘 | Tan Chengxuan Sun Ye Wang Ruijiang | 1997 | Environmental Geology1997，32，4： | 1 |
| 18 | The Stress State of the Beichuan-Jiangyou Segment of the Longmenshan Fault before and after the Wenchuan M_S 8.0 Earthquake显示文摘After the Wenchuan MS 8.0 Earthquake, which occurred on May 12, 2008, in Sichuan Province, China, we conducted a series of hydraulic fracturing stress measurements in three 200 m deep boreholes(ZK01, ZK02, and ZK03) drilled in Beichuan and Jiangyou regions near the northeastern segment of Longmenshan fault belt in 2009. These measurements revealed the near-surface stress field in the fault region one year after the Wenchuan MS 8.0 Earthquake. However, the lack of the stress measurements before the earthquake in the same region makes it difficult to understand variations of the in situ stress field(near-surface) by comparative analysis. In order to determine the unknown horizontal principal stresses before the earthquake in Beichuan and Jiangyou regions, the following research method was tentatively applied. Firstly, we calculate the static co-seismic stress field by linear elastic finite element numerical simulation with ANSYS, based on the co-seismic static displacement generated by the Wenchuan MS 8.0 Earthquake along the central Longmenshan fault plane in Beichuan and Jiangyou. Secondly, combining hydraulic fracturing measurements(after the earthquake) with the co-seismic stress(simulation), the magnitudes and orientations of horizontal principal stresses before the earthquake were calculated. Finally, the variation of the in situ stress(near-surface) in Beichuan and Jinagyou, both before and after the Wenchuan MS 8.0 Earthquake, were obtained by comparative analysis. To do this the magnitude of SHmax was decreased on average by 13.01 and 6.54 MPa after the earthquake in ZK02 and ZK03, respectively and the magnitude of SHmin was decreased by 2.54 and 5.29 MPa in ZK02 and ZK03, respectively. Following the earthquake, the average direction of SHmax rotated anticlockwise by 42.5°. | Chengjun Feng Qunce Chen Chengxuan Tan Xianghui Qin Peng Zhang Wen Meng | 2014 | Journal of Earth Science2014，25，5： | 0 |
| 19 | Quantitative Assessment and Zonation of Regional Crustal Stability in China显示文摘QuantitativeAssessmentandZonationofRegionalCrustalStabilityinChinaSunYe;TanChengxuan(UrbanandEngineeringSiteStabilityResearch... | Sun Ye Tan Chengxuan(Urban and Engineering Site Stability Research Center, CAGS, Beijing 101601) | 1996 | Journal of Earth Science1996，15，2： | 0 |
| 20 | Grey Prediction of Seismic Activity in the Three Gorges Area of the Yangtze River显示文摘On the basis of historical earthquake data and recent observations, two grey models prediction of the next seismic active period and the maximal magnitude of earthquakes which might occur during that period are constructed on the basis of the grey theory. As predicted by the two models, the next seismic active period would last 79 years, and that the maximal magnitude of earthquakes occurring within the period would not exceed 5.2. These results provide an important basis for the assessment of earthquake risks and reduction of disasters in the Three Gorges area. | HU Daogong WU Shuren TAN Chengxuan | 1999 | Acta Geologica Sinica(English Edition)1999，73，3： | 0 |
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