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| 1 | Upper mantle anisotropy and crust-mantle deformation pattern beneath the Chinese mainland显示文摘Over the past 10 years,the number of broadband seismic stations in China has increased significantly.The broadband seismic records contain information about shear-wave splitting which plays an important role in revealing the upper mantle anisotropy in the Chinese mainland.Based on teleseismic SKS and SKKS phases recorded in the seismic stations,we used the analytical method of minimum transverse energy to determine the fast wave polarization direction and delay time of shear-wave splitting.We also collected results of shear-wave splitting in China and the surrounding regions from previously published papers.From the combined dataset we formed a shear-wave splitting dataset containing 1020 parameter pairs.These splitting parameters reveal the complexity of the upper mantle anisotropy image.Our statistical analysis indicates stronger upper mantle anisotropy in the Chinese mainland,with an average shear-wave time delay of 0.95 s;the anisotropy in the western region is slightly larger(1.01 s)than in the eastern region(0.92 s).On a larger scale,the SKS splitting and surface deformation data in the Tibetan Plateau and the Tianshan region jointly support the lithospheric deformation mode,i.e.the crust-lithospheric mantle coherent deformation.In eastern China,the average fast-wave direction is approximately parallel to the direction of the absolute plate motion;thus,the upper mantle anisotropy can be attributed to the asthenospheric flow.The area from the Ordos block to the Sichuan Basin in central China is the transition zone of deformation modes between the east and the west regions,where the anisotropy images are more complicated,exhibiting'fossil'anisotropy and/or two-layer anisotropy.The collision between the Indian Plate and the Eurasian Plate is the main factor of upper mantle anisotropy in the western region of the Chinese mainland,while the upper mantle anisotropy in the eastern region is related to the subduction of the Pacific Plate and the Philippine Sea Plate beneath the Eurasian Plate. | WANG ChunYong CHANG LiJun DING ZhiFeng LIU QiongLin LIAO WuLin Lucy M FLESCH | 2014 | Science China Earth Sciences2014，57，1： | 18 |
| 2 | Source rupture process of the 2015 Gorkha, Nepal Mw7.9 earthquake and its tectonic implications显示文摘On 25 April, 2015, an Mw7.9 earthquake occurred in Nepal, which caused great economic loss and casualties. However, almost no surface ruptures were observed. Therefore, in order to interpret the phenomenon, we study the rupture process of the earthquake to seek answers. Inversion of teleseismic body-wave data is applied to estimate the rupture process of the 2015 Nepal earthquake. To obtain stable solutions, smoothing and non-negative constraints are introduced. 48 teleseismic stations with good coverage are chosen. Finite fault model is established with length and width of 195 km and 150 km, and we set the initial seismic source parameters referring to CMT solutions. Inversion results indicate that the focal mechanism of this earthquake is a thrust fault type, and the strike, dip and rake angle are in accordance with CMT results. The seismic moment is 0.9195 ×10^(21)Nm(Mw7.9), and source duration is about 70s. The rupture nucleated near the hypocenter and then propagated along the dip direction to the southeast, and the maximum slip amounts to 5.2 m. Uncertainties on the amount of slip retrieved by different inversion methods still exist, the overall characteristics are inconsistent. The lack of shallow slip during the 2015 Gorkha earthquake implies future seismic hazard and this region should be paid more attention to. | Lifen Zhang Jinggang Li Wulin Liao Qiuliang Wang | 2016 | Geodesy and Geodynamics2016，7，2： | 5 |
| 3 | Source rupture process inversion of the 2013 Lushan earthquake,China显示文摘The spatial and temporal slip distribution of the Lushan earthquake was estimated using teleseismic body wave data.To perform a stable inversion,we applied smoothing constraints and determined their optimal relative weights on the observed data using an optimized Akaike's Bayesian Information Criterion (ABIC).The inversion generated the source parameters.Strike,dip and slip were 218°,39° and 100.8°,respectively.A seismic moment (M0) was 2.1×1020 Nm with a moment magnitude (Mw) of 6.8,and a source duration was approximately 30 second.The rupture propagated along the dip direction,and the maximum slip occurred at the hypocenter.The maximum slip was approximately 2.1 m,although this earthquake did not cause an apparent surface rupture.The energy was mainly released within 10 second.In addition,the Lushan earthquake was apparently related to the 2008 Wenchuan earthquake.However,the question of whether it was an aftershock of the Wenchuan earthquake requires further study. | Zhang Lifen Iman Fatchurochman Liao Wulin Li Jinggang Wang Qiuliang | 2013 | Geodesy and Geodynamics2013，4，2： | 5 |
| 4 | Analysis of the relationship between water level fluctuation and seismicity in the Three Gorges Reservoir(China)显示文摘The Three Gorges Reservoir is a good site for the further researches on reservoir induced seismicity due to decades' seismic monitoring. After the first water impounding in 2003, seismic activity becomes more frequent than that before water impoundment. In order to quantitatively study, the relationship between the water level fluctuation and earthquakes in TGR, we introduced statistical methods to attain the goal.First of all, we relocated the earthquakes in TGR region with double difference method and divided the earthquakes into 5 clusters with clustering analysis method. Secondly, to examine the impacts of water level fluctuation in different water filling stages on the seismic activity in the 5 clusters, a series of statistical analyses are applied. Pearson correlation results show that only the 175 m water level fluctuation has significantly positive impacts on the seismic activity in clusters Ⅰ, Ⅱ, Ⅲ and Ⅴ with correlation coefficients of 0.44, 0.38, 0.66 and 0.63. Cross-correlation analysis demonstrates that 0, 1, 0 and 0 month time delay separately for the clusters Ⅰ, Ⅱ, Ⅲ and Ⅴ exists. It illustrated the influences of the water loading and pore pressure diffusion on induced earthquakes. Cointegration tests and impulse response analysis denoted that the 175 m water level only had long term and significant effects just on the seismic events in the intersection region of the Fairy Mount Fault and Nine-brook Fault. One standard deviation shock to175 m water level increased the seismic activity in cluster Ⅴ for the first 3 months, and then the negative influence was shown. After 7 months, the negative impulse response becomes stable. The long-term effect of the 175 m water impoundment also proved the important role of pore pressure diffusion in RIS with time. | Lifen Zhang Jinggang Li Guichun Wei Wulin Liao Qiuliang Wang Chuanfang Xiang | 2017 | Geodesy and Geodynamics2017，8，2： | 4 |
| 5 | Factor analysis of earthquake-induced geological disasters of the M7.0 Lushan earthquake in China显示文摘The seismic intensities,lithologic characteristics and terrain features from a 3000 km2-region near the epicenter of the Lushan earthquake are used to analyze earthquake-induced geological disaster.The preliminary results indicate that secondary effects of the earthquake will affect specific areas,including those with glutenite and carbonate bedrock,a seismic intensity of IX,slopes between 40° and 50°,elevations of less than 2500 m,slope change rates between 20° and 30°,slope curvatures from-1 to-0.5 and 0.5 to 1,and relief between 50 and 100 m.Regions with susceptibility indices greater than 0.71 are prone to landslides and collapses.The secondary features are mainly distributed on both sides of the ridges that extend from Baosheng to Shuangshi and from Baosheng to Longxing.Other features are scattered on both sides of the ridges that extend from Qishuping to Baosheng and from Masangping to Lingguan.The distribution of the earthquake-related features trends in the NE direction,and the area that was most affected by the Lushan earthquake covers approximately 52.4 km2. | Li Xue Liu Xiaoli Li Jinggang Wang Qiuliang Liao Wulin Zhang Lifen | 2013 | Geodesy and Geodynamics2013，4，2： | 3 |
| 6 | Building damages in Deyang city by the 2008 Wenchuan earthquake显示文摘The Ms8. 0 Wenchuan earthquake in 2008 caused huge casualties,economic losses,and building damages,which are analyzed. The results show that damages of houses designed according to the current seismic code were significantly smaller than those without such design,suggesting that the code has achieved the desired goal of seismic fortification. Buildings of different kinds of structures showed large differences in damages: Houses with steel-frames and shear walls or steel structures suffered the least damages; those with frames or with brick-and-concrete structures suffered more; old cottages,the most. | Wang Qiuliang LiJinggang Liao Wulin Zhang Lifen Qin Xiaojun | 2011 | Geodesy and Geodynamics2011，2，4： | 3 |
| 7 | Estimation of the 2010 Mentawai tsunami earthquake rupture process from joint inversion of teleseismic and strong ground motion data显示文摘Joint inversion of teleseismic body-wave data and strong ground motion waveforms was applied to determine the rupture process of the 2010 Mentawai earthquake. To obtain stable solutions, smoothing and non-negative constraints were introduced. A total of 33 teleseismic stations and 5 strong ground motion stations supplied data. The teleseismic and strong ground motion data were separately windowed for 150 s and 250 s and bandpass filtered with frequencies of 0.001e1.0 Hz and 0.005e0.5 Hz, respectively. The finitefault model was established with length and width of 190 km and 70 km, and the initial seismic source parameters were set by referring to centroid moment tensor(CMT) solutions. Joint inversion results indicate that the focal mechanism of this earthquake is thrust fault type, and the strike, dip, and rake angles are generally in accordance with CMT results. The seismic moment was determined as 5.814 1020Nm(Mw7.8) and source duration was about 102 s, which is greater than those of other earthquakes of similar magnitude. The rupture nucleated near the hypocenter and then propagated along the strike direction to the northwest, with a maximum slip of 3.9 m. Large uncertainties regarding the amount of slip retrieved using different inversion methods still exist; however, the conclusion that the majority of slip occurred far from the islands at very shallow depths was found to be robust. The 2010 Mentawai earthquake was categorized as a tsunami earthquake because of the long rupture duration and the generation of a tsunami much larger than was expected for an earthquake of its magnitude. | Zhang Lifen Liao Wulin Li Jinggang Wang Qiuliang | 2015 | Geodesy and Geodynamics2015，6，3： | 1 |
| 8 | Source parameters determination for earthquakes in Kushiro,Japan considering source time function显示文摘This paper applies a new formulation to do moment tensor inversion for earthquakes in the Kushiro area of Japan.Comparing with conventional moment tensor inversion method,the new one takes the effect of source time function into consideration.For the inversion,best solution is obtained byminimizing the difference between the observed seismograms and the synthetic ones.And the best-fitting focal depth is determined from the variance reduction.The results indicate that half duration of source time function is proportional to the magnitude of earthquakes.Large earthquakes have long half duration,whereas that of moderate-small earthquakes is comparatively shorter.The focal mechanisms of all three earthquakes are of thrust fault type,which is mainly ascribed to the collision of the North American plate with the Eurasia plate in the late Cretaceous or Paleogene. | Lifen Zhang Wulin Liao Guichun Wei Jinggang Li Qiuliang Wang | 2012 | Earthquake Science2012，25，2： | 0 |
| 9 | Correlation between seismicity and geomorphology in Dingxi Basin,Gansu Province,China显示文摘A M6.6 earthquake occurred on July 22,2013 at Dingxi Basin in Gansu Province within the tectonially expanding northeastern margin of the Qinghai-Tibet Plateau.We analyzed the geomorphological features of the Dingxi Basin by using remote sensing technology and compared them with local seismic activity.We found that most of the river basins are at the robust stage of development and that the major local rivers and the development of some basins boundaries are controlled by the seismic faults.Among four zones identified to have significant tectonic activities,the northwestly-oriented one located in the south has the highest seismic activity,and it is where the M6.6 earthquake occurrred. | Li Xue Liu Xiaoli Li Jinggang Zhang Lifen Wang Qiuliang Liao Wulin | 2013 | Geodesy and Geodynamics2013，4，4： | 0 |
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