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| 1 | Determination of focal depth by two waveform-based methods:A case study for the 2008 Panzhihua earthquake显示文摘With the 2008 M S 6.1 Panzhihua earthquake as a case study,we demonstrate that the focal depth of the main shock can be well constrained with two approaches:(1) using the depth phase sPL and (2) using full waveform inversion of local and teleseismic data.We also show that focal depths can be well constrained using the depth phase sPL with single broadband seismic station.Our study indicates that the main shock is located at a depth of 11 km,much shallower than those from other studies,confirming that the earthquake occurs in upper crust.Aftershocks are located in the depth range of 11-16 km,which is consistent with a ruptured near vertical fault whose width is about 10 km,as expected for an M S 6.1 earthquake. | Zhenjie Wang Jiajun Chong Sidao Ni Barbara Romanowicz | 2011 | Earthquake Science2011，24，4： | 17 |
| 2 | Near surface velocity and Q_s structure of the Quaternary sediment in Bohai basin,China显示文摘Heavily populated by Beijing and Tianjin cities,Bohai basin is a seismically active Cenozoic basin suffering from huge lost by devastating earthquakes,such as Tangshan earthquake.The attenuation(QP and QS) of the surficial Quaternary sediment has not been studied at natural seismic frequency(1-10 Hz),which is crucial to earthquake hazards study.Borehole seismic records of micro earthquake provide us a good way to study the velocity and attenuation of the surficial structure(0-500 m).We found that there are two pulses well separated with simple waveforms on borehole seismic records from the 2006 MW4.9 Wen'an earthquake sequence.Then we performed waveform modeling with generalized ray theory(GRT) to confirm that the two pulses are direct wave and surface reflected wave,and found that the average vP and vS of the top 300 m in this region are about 1.8 km/s and 0.42 km/s,leading to high vP/vS ratio of 4.3.We also modeled surface re-flected wave with propagating matrix method to constrain QS and the near surface velocity structure.Our modeling indicates that QS is at least 30,or probably up to 100,much larger than the typically assumed extremely low Q(~10),but consistent with QS modeling in Mississippi embayment.Also,the velocity gradient just beneath the free surface(0-50 m) is very large and velocity increases gradually at larger depth.Our modeling demonstrates the importance of borehole seismic records in resolving shallow velocity and attenuation structure,and hence may help in earthquake hazard simulation. | Jiajun Chong Sidao Ni | 2009 | Earthquake Science2009，22，5： | 7 |
| 3 | Collection and evaluation of the genus Lilium resources in Northeast China显示文摘 | RONG Liping LEI Jiajun WANG Chong | 2010 | Genet Resour Crop Evol2010，58，1： | 1 |
| 4 | Causative fault and seismogenic mechanism of the 2010 Suining M5.0 earthquake from joint modeling of seismic and InSAR data显示文摘Although the Sichuan basin is a stable block with low historical seismicity,the Suining M5.0 earthquake on January31,2010 occurred near the center of the basin,causing casualty and substantial damage.Previous studies have shown that the earthquake is very shallow and may occur in the sedimentary cover rocks,but its causative fault has not been identified.Based on local broadband seismic waveform data as well as a pair of ALOS PALSAR ascending orbit data,we explore the seismogenic mechanism via further constraining the source depth and the ruptured fault.The earthquake caused ground uplift in the southeast of the epicenter area,with a maximum line of sight displacement of about 13.6 cm,much larger than the displacement caused by a M5 earthquake at a typical depth of 10 km,which indicates that the earthquake is very shallow.Through joint inversion of seismic waveform and InSAR data,we obtain the moment magnitude of Suining earthquake as MW4.5,with the strike,dip,and rake of its fault plane as 17°,66° and 90°,respectively,and the centroid depth less than 1 km,supporting that the earthquake occurred at the shallow part of a high angle thrust fault dipping to the southeast.It is further confirmed that the earthquake may be triggered by the diffusion of high-pressure fluid migrating from the underside gas reservoir. | Wangwang GU Sidao NI Shuofan WANG Baolong ZHANG Xinglin LEI Risheng CHU Aizhi GUO Qiang SHEN Hansheng WANG Liming JIANG Minhan SHENG Jiajun CHONG | 2023 | Science China Earth Sciences2023，66，8： | 0 |
| 5 | 3D S-wave velocity structure of the Ningdu basin in Jiangxi province inferred from ambient noise tomography with dense array显示文摘The Ningdu basin,located in southern Jiangxi province of southwest China,is one of the Mesozoic basin groups which has exploration prospects for geothermal energy.A study on the detailed velocity structure of the Ningdu basin can provide important information for geothermal resource exploration.In this study,we deployed a dense seismic array in the Ningdu basin to investigate the 3D velocity structure and discuss implications for geothermal exploration and geological evolution.Based on the dense seismic array including 35 short-period(5 s-100 Hz)seismometers with an average interstation distance of~5 km,Rayleigh surface wave dispersion curves were extracted from the continuous ambient noise data for surface wave tomographic inversion.Group velocity tomography was conducted and the 3D S-wave velocity structure was inverted by the neighborhood algorithm.The results revealed obvious low-velocity anomalies in the center of the basin,consistent with the low-velocity Cretaceous sedimentary rocks.The basement and basin-controlling fault can also be depicted by the S-wave velocity anomalies.The obvious seismic interface is about 2 km depth in the basin center and decreases to 700 m depth near the basin boundary,suggesting spatial thickness variations of the Cretaceous sediment.The fault features of the S-wave velocity profile coincide with the geological cognition of the western boundary basincontrolling fault,which may provide possible upwelling channels for geothermal fluid.This study suggests that seismic tomography with a dense array is an effective method and can play an important role in the detailed investigations of sedimentary basins. | Long Teng Xiangteng Wang Chunlei Fu Feng Bao Jiajun Chong Sidao Ni Zhiwei Li | 2023 | Earthquake Research Advances2023，3，1： | 0 |
| 6 | 体波接收函数与瑞利波椭圆率联合反演研究显示文摘近年来,结合体波接收函数或瑞利波椭圆率,面波频散已被广泛应用于岩石层结构的成像研究中。由于面波频散是其传播路径的总传播效应,因此联合反演方法需依赖于密集的地震台阵或较高的地震活动性,从而获得局部速度结构。但是,接收函数和瑞利波椭圆率均为具有局部敏感性的单台测量方法,并且能自然地相互合并进行联合反演。本文中,我们对利用瑞利波椭圆率和接收函数联合反演的可行性进行了探讨。我们通过正演模拟进行了敏感性检验,发现接收函数对速度跃变的界面较为敏感,但对长波结构显示较弱的敏感性,这几乎与瑞利波椭圆率互补。因此,利用两种单台测量方法进行联合反演为地震台站下方的速度结构提供了更严格的条件约束。本文提出了一种基于快速模拟退火方法的联合反演算法,对岩石层结构的瑞利波椭圆率和接收函数进行反演。该算法在印度克拉通和美国威利斯顿盆地的应用中,在减少反演的非唯一性方面证明了其有效性。但是,通过该联合反演可能无法获得有效的地壳平均速度,表明有必要结合面波频散(或其他类型的观察研究)、接收函数和瑞利波椭圆率来获得更准确的速度结构。 | Jiajun Chong Sidao Ni Risheng Chu Paul Somerville 张尧(译) 田宝峰(校) | 2017 | 世界地震译丛2017，48，3： | 0 |
| 7 | Inhibition of proliferation,migration,and invasiveness of bladder cancer cells through SAPCD2 knockdown显示文摘Introduction:Bladder cancer(BC)has a high incidence and mortality rate worldwide.Suppressor anaphasepromoting complex domain containing 2(SAPCDC2)is over-expressed in a variety of tumors.Objectives:This study investigated the effects of SAPCD2 knockdown on BC cells.Methods:T24 and UMUC3 cell models and the xenografted BC tumor model with SAPCD2 knockdown were established to observe the malignant phenotype of BC cells by cell counting kit-8 assay,colony formation test,wound healing,and Transwell assay,mRNA and proteins expressions were measured with quantitative real-time polymerase chain reaction,western blotting,and tissue immunohistochemistry.Lithium chloride agonist on the Wnt/β-catenin pathway was used to clarify the molecular mechanism of SAPCD2 knockdown.Results:SAPCD2 expression was significantly higher in BC cell lines than in SVHUC-1 cells.SAPCD2 knockdown inhibited viability and cloning,hindered the G0/G1 phase of the cell cycle in UMUC3 and T24 cells,and decreased the migration and invasiveness of BC cells.SAPCD2 knockdown inhibited expression levels of cyclin D1,cyclin B1,N-cadherin,vimentin,Snail,β-catenin,c-Myc,and cyclin-dependent kinase 4,while the P21 and E-cadherin were raised by SAPCD2 knockdown.Furthermore,lithium chloride reversed the effects of SAPCD2 knockdown on the expression levels of the above proteins in UMUC3 and T24 cells.In vivo,SAPCD2 knockdown inhibited the volume,weight,and expression of Ki-67 andβ-catenin in tumors and increased the E-cadherin expression.Conclusion:SAPCD2 knockdown inhibits the malignant phenotype of BC via a pathway involvingβ-catenin. | CHONG SHEN JIAJUN YAN YU REN ZHIRONG ZHU XIAOLONG ZHANG SHUIXIANG TAO | 2024 | BIOCELL2024，48，1： | 0 |
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