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| 1 | Bounding of near-fault ground motion based on radiated seismic energy with a consideration of fault frictional mechanisms显示文摘The energy radiated as seismic waves strongly depends on the fault rupture process associated with rupture speed and dynamic frictional mechanisms involved in the fault slip motion.Following McGarr and Fletcher approach,we derived a physics-based relationship of the weighted average fault slip velocity vs apparent stress,rupture speed and static stress drop based on a dynamic circular fault model.The resultant function can be approximately used to bound near-fault ground motion and seismic energy associated with near-fault coseismic deformation.Fault frictional overshoot and undershoot mechanisms governed by a simple slip-weakening constitutive relation are included in our consideration by using dynamic rupture models named as M-and D-models and proposed by Madariaga(1976) and Boatwright.We applied the above function to the 2008 great Wenchuan earthquake and the 1999 Jiji(Chi-Chi) earthquake to infer the near-fault ground motion called slip weighted average particle velocity and obtained that such model-dependent prediction of weighted average ground velocities is consistent to the results derived from the near-fault strong motion observations.Moreover,we compared our results with the results by McGarr and Fletcher approach,and we found that the values of the weighted average particle velocities we obtained for these two earthquakes are generally smaller and closer to the values by direct integration of strong motion recordings of the near-fault particle velocity waveform data.In other words,if this result comes to be true,it would be a straightforward way used to constrain the near-fault ground motion or to estimate source parameters such as rupture speed,static and dynamic stress drops. | Baoping Shi Boyan Liu Lingyuan Meng | 2010 | Earthquake Science2010，23，4： | 2 |
| 2 | Diatom and silicoflagellate assemblages in modern surface sediments associated with human activity: A case study in Sishili Bay, China显示文摘 | Baoping Di Dongyan Liu Yujue Wang Zhijun Dong Xin Li Yajun Shi | 2013 | Ecological Indicators2013，，： | 1 |
| 3 | 对1906年旧金山地震期间雷斯角火车站地面加速度的估计显示文摘推导出了二维对称刚性块体在水平地面加速度的全正弦波作用下的振动和倾覆响应的解析解。我们用此解估算了致使开往旧金山的列车颠覆的1906年旧金山地震期间加利福尼亚州雷斯角火车站的峰值地面加速度的下限。对单个正弦波在3%阻尼比的条件下,我们得到1,1.5和2Hz的最小颠覆加速度分别为0.35g,0.5g和1.05g。对较真实的加速度图,颠覆加速度约为1.1g(综合数据)和0.76g(1992年兰德斯地震时卢塞恩的记录)。 | A. Anooshehpoor T. H. Heaton Baoping Shi J. N. Brune 刘志远 | 2000 | 世界地震译丛2000，31，4： | 1 |
| 4 | High-Purity Nano Particles ZnS Production by a Simple Coupling ReactionProcess of Biological Reduction and Chemical Precipitation Mediated with EDTA显示文摘 | Xin Baoping Huang Qun Chen Shi | 2008 | Biotechnology Progress2008，24，5： | 1 |
| 5 | Polariton lasing in InGaN quantum wells at room temperature显示文摘In this paper,we report the exciton polaritons in both positive and negative detuning micro cavities based on InGaN multi-quantum wells(MQWs)and the first polariton lasing in InGaN/GaN MQWs at room temperature by utilizing a 4.5λFabry-Perot(F-P)cavity with double dielectric distributed Bragg reflectors(DBRs).Double thresholds corresponding respectively to polariton lasing and photonic lasing are observed along with half-width narrowing and peak blue-shifts.The threshold of polariton lasing is about half of the threshold of photonic lasing.Our results paved a substantial way for ultra-low threshold lasers and room temperature Bose-Einstein Condensate(BEC)in nitride semiconductors. | Jinzhao Wu Hao Long Xiaoling Shi Song Luo Zhanghai Chen Zhechuan Feng Leiying Ying Zhiwei Zheng Baoping Zhang | 2019 | Opto-Electronic Advances2019，2，12： | 1 |
| 6 | Strong ground motion simulation for the 2013 Lushan M_W6.6 earthquake, Sichuan, China, based on the inverted and synthetic slip models显示文摘It is well known that quantitative estimation of slip distributions on fault plane is one of the most important issues for earthquake source inversion related to the fault rupture process. The characteristics of slip distribution on the main fault play a fundamental role to control strong ground motion pattern. A large amount of works have also suggested that variable slip models inverted from longer period ground motion recordings are relevant for the prediction of higher frequency ground motions. Zhang et al.(Chin J Geophys 56:1412–1417,2013) and Wang et al.(Chin J Geophys 56:1408–1411, 2013)published their source inversions for the fault rupturing process soon after the April 20, 2013 Lushan earthquake in Sichuan,China. In this study, first, we synthesize two forward source slip models: the value of maximum slip, fault dimension, size, and dimension of major asperities, and corner wave number obtained from Wang's model is adopted to constrain the generation of k-2model and crack model. Next, both inverted and synthetic slip models are employed to simulate the ground motions for the Lushan earthquake based on the stochastic finite-fault method. In addition, for a comparison purpose, a stochastic slip model and another k-2model(k-2model II) with2 times value of corner wave number of the original k-2model(k-2model I) are also employed for simulation for Lushan event. The simulated results characterized by Modified Mercalli Intensity(MMI) show that the source slip models based on the inverted and synthetic slip distributions could capture many basic features associated with the ground motion patterns.Moreover, the simulated MMI distributions reflect the rupture directivity effect and the influence of the shallow velocity structure well. On the other hand, the simulated MMI bystochastic slip model and k-2model II is apparently higher than observed intensity. By contrast, our simulation results show that the higher frequency ground motion is sensitive to the degree of slip roughness; therefore, we suggest that, for realistic groundmotion simulations due to future earthquake, it is imperative to properly estimate the slip roughness distribution. | Wenhao Shen Qiu Zhong Baoping Shi | 2014 | Earthquake Science2014，27，4： | 1 |
| 7 | Failure time variation derived from R–S relation: the role of the static stress perturbation显示文摘In general, earthquake cycle related to earthquake faulting could include four major processes which could be described by(1) fault locking,(2) self-acceleration or nucleation(possible foreshocks),(3) coseismic slip, and(4) post-stress relaxation and afterslip. A sudden static stress change/perturbation in the surrounding crust can advance/ delay the fault instability or failure time and modify earthquake rates. Based on a simple one-dimensional spring-slider block model with the combination of rate-and-statedependent friction relation, in this study, we have approximately derived the simple analytical solutions of clock advance/delay of fault failures caused by a sudden static Coulomb stress change applied in the different temporal evolution periods during an earthquake faulting. The results have been used in the physics-based explanation of delayed characteristic earthquake in Parkfield region, California, in which the next characteristic earthquake of M 6.0 after 1966 occurred in 2004 instead of around 1988 according to its characteristic return period of 22 years. At the same time, the analytical solutions also indicate that the time advance/ delay in Coulomb stress change derived by the dislocation model has a certain limitation and fundamental flaw. Furthermore, we discussed the essential difference between rate- and state-variable constitutive(R–S) model and Coulomb stress model used commonly in current earthquake triggering study, and demonstrated that, in fact, the Coulomb stress model could be involved in the R–S model. The results, we have obtained in this study, could be used in the development of time-dependent fault interaction model and the probability calculation related to the time-dependent and renewal earthquake prediction model. | Qiu Zhong Wenhao Shen Baoping Shi | 2014 | Earthquake Science2014，27，1： | 0 |
| 8 | Transient postseismic slip and aftershock triggering:A case study of the 2008 M_W7.9 Wenchuan Earthquake,China显示文摘In this study,we investigate how a stress variation generated by a fault that experiences transient postseismic slip(TPS)affects the rate of aftershocks.First,we show that the postseismic slip from Rubin-Ampuero model is a TPS that can occur on the main fault with a velocity-weakening frictional motion,that the resultant slip function is similar to the generalized Jeffreys-Lomnitz creep law,and that the TPS can be explained by a continuous creep process undergoing reloading.Second,we obtain an approximate solution based on the Helmstetter-Shaw seismicity model relating the rate of aftershocks to such TPS.For the Wenchuan sequence,we perform a numerical fitting of the cumulative number of aftershocks using the Modified Omori Law(MOL),the Dieterich model,and the specific TPS model.The fitting curves indicate that the data can be better explained by the TPS model with a B/A ratio of approximately 1.12,where A and B are the parameters in the rate-and state-dependent friction law respectively.Moreover,the p and c that appear in the MOL can be interpreted by the B/A and the critical slip distance,respectively.Because the B/A ratio in the current model is always larger than 1,the model could become a possible candidate to explain aftershock rate commonly decay as a power law with a p-value larger than 1.Finally,the influence of the background seismicity rate r on parameters is studied;the results show that except for the apparent aftershock duration,other parameters are insensitive to r. | Mengyu Xie Baoping Shi Lingyuan Meng | 2023 | Earthquake Science2023，36，6： | 0 |
| 9 | A brief discussion on the relationship between apparent stress and slip-weakening law based on the energy partition criteria显示文摘According to the representation theorem of seismic energy radiation,we know that,at any point on the fault,the instantaneous seismic radiation energy,ES,the seismic moment M0,and the apparent stress σa=μES /M0(μ is the shear modulus on the fault plane) should be positive values at any time during an earthquake faulting.However,we have noticed that,in recent source parameter inversion scheme for deriving the critical slip-weakening distance,the apparent stress used as a constraint condition on the fault plane could be less than zero or negative value,and the negative part was considered as dissipation energy and incorporated to the fracture energy.Although the mathematical formula in such case has no influence to the final resolution,however,the earthquake dynamic source process violates obviously the basic physical law,which could results in the overestimating of radiated seismic energy.In this study,we have proposed an alternative way to take account of the apparent stress expression based on the earthquake energy partition principle,and at the same time,we have also suggested that an additional constraint regarding to the radiation energy conservation on the fault could be added into the source parameter inversion in order to estimate the critical slip-weakening distance Dc. | Boyan Liu Baoping Shi | 2009 | Earthquake Science2009，22，1： | 0 |
| 10 | Effect of the free surface on the earthquake energy:A case study of reverse faulting显示文摘Based on the representation theorem of seismic energy radiation,in this study,we have quantitatively investigated the effect of free surface on the radiation energy distribution due to a coupling interaction between free surface and near surface finite fault for the reverse earthquake faulting.Corresponding to the finite faulting,a 2-D pseudostatic-reverse-fault-dislocation solution has been used in the calculation of the work done by the seismic response against free surface.The results indicate that,due to a strong coupling interaction between the free surface and near surface fault,the total radiated seismic energy ER is much larger than that radiated only from the fault itself(EF),especially for the shallow reverse faulting.In convention,EF is commonly used in the estimation of earthquake energy radiation.However,when the fault depth H,the distance between the free surface and top of fault location,increases,the effect of the coupling interaction between the fault and free surface decreases gradually.Therefore,the total radiated energy ER approaches to the EF when the depth H is about 2 times the fault length l.The current study could provide us a partial explanation of the apparent stress discrepancy observed at the far field and near field in the recent large earthquake.Moreover,the current study also has a significant implication of how to quantitatively describe the near fault strong ground motion and associated seismic hazard from the earthquake source energy point of view. | LI YanHeng SHI BaoPing ZHANG Jian | 2009 | Chinese Science Bulletin2009，54，13： | 0 |
| 11 | Ethanol extract of Cyathulae Radix inhibits osteoclast differentiation and bone loss显示文摘Cyathulae Radix,a traditional Chinese medicine and a common vegetable,boasts a history spanning millennia.It enhances bone density,boosts metabolism,and effectively alleviates osteoporosis-induced pain.Despite its historical use,the molecular mechanisms behind Cyathulae Radix’s impact on osteoporosis remain unexplored.In this study,we investigated the effects and mechanisms of Cyathulae Radix ethanol extract(CEE)in inhibiting osteoporosis and osteoclastogenesis.Eight-week-old female mice underwent ovariectomy and were treated with CEE for eight weeks.Micro-computed tomography(micro-CT)assessed histomorphometric parameters,bone tissue staining observed distal femur histomorphology,and three-point bending tests evaluated tibia mechanical properties.Enzyme-linked immunosorbent assay(ELISA)measured serum estradiol(E2),receptor activator for nuclear factor B ligand(RANKL),and osteoprotegerin(OPG)levels.Osteoclastogenesis-related markers were analyzed via Western blotting(WB)and quantitative real-time polymerase chain reaction(qRT-PCR).Additionally,CEE effects on RANKL-induced osteoclast formation and bone resorption were investigated in vitro using tartrate-resistant acid phosphatase(TRAP)staining,qRT-PCR,and WB assay.Compared with the ovariectomy(OVX)group,CEE treatment enhanced trabecular bone density,maximal load-bearing capacity,and various histomorphometric parameters.Serum E2 and OPG levels significantly increased,while Receptor activator of nuclear factor-κB(RANK)decreased in the CEE group.CEE downregulated matrix metallopeptidase 9(MMP-9),Cathepsin K(CTSK),and TRAP gene and protein expression.In bone marrow macrophages(BMMs),CEE reduced mature osteoclasts,bone resorption pit areas,and MMP-9,CTSK,and TRAP expression during osteoclast differentiation.Compared with DMSO treatment,CEE markedly inhibited RANK,TNF receptor associated factor 6(TRAF6),Proto-oncogene c-Fos(c-Fos),Nuclear factor of activated T-cells cytoplasmic 1(NFATc1)expressions,and Extracellular regulated protein kinases(ERK),c-Jun N-terminal kinase(JNK),NF-kappa B-p65(p65)phosphorylation in osteoclasts.In conclusion,CEE significantly inhibits OVX-induced osteoporosis and RANKL-induced osteoclastogenesis,potentially through modulating the Estrogen Receptor(ER)/RANK/NFATc1 signaling pathway. | SHI Liying REN Liuyi LI Jinping LIU Xin LU Jingjing JIA Lujuan XIE Baoping TANG Siyuan LIU Wei ZHANG Jie | 2024 | Chinese Journal of Natural Medicines2024，22，3： | 0 |
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