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| 1 | Site effects by generalized inversion technique using strong motion recordings of the 2008 Wenchuan earthquake显示文摘The generalized inversion of S-wave amplitude spectra from the free-field strong motion recordings of the China National Strong Motion Observation Network System (NSMONS) are used to evaluate the site effects in the Wenchuan area. In this regard, a total of 602 recordings from 96 aftershocks of the Wenchuan earthquake with magnitudes of M3.7-M6.5 were selected as a dataset. These recordings were obtained from 28 stations at a hypocenter distance ranging from 30 km to 150 km. The inversion results have been verified as reliable by comparing the site response at station 62WUD using the Generalized Inversion Technique (GIT) and the Standard Spectral Ratio method (SSR). For all 28 stations, the site predominant frequency Fp and the average site amplification in different frequency bands of 1.0-5.0Hz, 5.0-10.0Hz and 1.0-10.0 Hz have been calculated based on the inversion results. Compared with the results from the horizontal-to-vertical spectral ratio (HVSR) method, it shows that the HVSR method can reasonably estimate the site predominant frequency but underestimates the site amplification. The linear fitting between the average site amplification for each frequency band and the Vs20 (the average uppermost-20 m shear wave velocity) shows good correlation. A distance measurement called the asperity distance DAspt is proposed to reasonably characterize the source-to-site distance for large earthquakes. Finally, the inversed site response is used to identify the soil nonlinearity in the main shock and aftershocks of Wenchuan earthquake. In ten of the 28 stations analyzed in the main shock, the soil behaved nonlinearly, where the ground motion level is apparently beyond a threshold of PGA > 300cm/s2 or PGV > 20cm/s, and only one station coded 51SFB has evidence of soil nonlinear behavior in the aftershocks. | Ren Yefei Wen Ruizhi Hiroaki Yamanaka Toshihide Kashima | 2013 | Earthquake Engineering and Engineering Vibration2013，12，2： | 20 |
| 2 | Preliminary site classification of free-field strong motion stations based on Wenchuan earthquake records显示文摘During the great Wenchuan earthquake, about 460 permanent free-field stations in National Strong Motion Observation Network System (NSMONS) of China captured the main shock acceleration records. These records can be applied to site effect analyses, and then the site classification of those permanent stations can be carried out firstly, which will served as the fundamental information for further research. In this paper, the site of near-fault stations is classified by horizontal-to-vertical spectral ratio (HVSR) method according to the site class description of Japan earthquake resistant design code and response spectral shapes (RSS) method following the site class description of the 1997 Uniform Building Code (UBC) provisions. Then based on the detailed borehole data of those free-field stations, the equivalent shear wave velocity and overburden thickness are calculated and the site classifications are given by Chinese code for seismic design of buildings. Furthermore, for the stations having successful microtremor test data, the site dominant periods are computed to verify the results of site classification. Finally, combined with all the above results, the recommended site classes of near-fault permanent free-field stations are given. | Ruizhi Wen Yefei Ren Zhenghua Zhou Dacheng Shi | 2010 | Earthquake Science2010，23，1： | 15 |
| 3 | Improved HVSR site classification method for free-field strong motion stations validated with Wenchuan aftershock recordings显示文摘Local site conditions play an important role in the effective application of strong motion recordings.In the China National Strong Motion Observation Network System(NSMONS),some of the stations do not provide borehole information,and correspondingly,do not assign the site classes yet.In this paper,site classification methodologies for free-field strong motion stations are reviewed and the limitations and uncertainties of the horizontal-to-vertical spectral ratio(HVSR) methods are discussed.Then,a new method for site classification based on the entropy weight theory is proposed.The proposed method avoids the head or tail joggle phenomenon by providing the objective and subjective weights.The method was applied to aftershock recordings from the 2008 Wenchuan earthquake,and 54 free-field NSMONS stations were selected for site classification and the mean HVSRs were calculated.The results show that the improved HVSR method proposed in this paper has a higher success rate and could be adopted in NSMONS. | Wen Ruizhi Ren Yefei Shi Dacheng | 2011 | Earthquake Engineering and Engineering Vibration2011，10，3： | 14 |
| 4 | Dye-Enhanced Self-Electrophoretic Propulsion of Light-Driven TiO_2–Au Janus Micromotors显示文摘Light-driven synthetic micro-/nanomotors have attracted considerable attention in recent years due to their unique performances and potential applications. We herein demonstrate the dye-enhanced self-electrophoretic propulsion of light-driven Ti O_2–Au Janus micromotors in aqueous dye solutions. Compared to the velocities of these micromotors in pure water, 1.7, 1.5, and 1.4 times accelerated motions were observed for them in aqueous solutions of methyl blue(10-5g L^(-1)), cresol red(10^(-4)g L^(-1)),and methyl orange(10^(-4)g L^(-1)), respectively. We determined that the micromotor speed changes depending on thetype of dyes, due to variations in their photodegradation rates. In addition, following the deposition of a paramagnetic Ni layer between the Au and Ti O_2 layers, the micromotor can be precisely navigated under an external magnetic field. Such magnetic micromotors not only facilitate the recycling of micromotors, but also allow reusability in the context of dye detection and degradation.In general, such photocatalytic micro-/nanomotors provide considerable potential for the rapid detection and ‘‘on-thefly'' degradation of dye pollutants in aqueous environments. | Yefei Wu Renfeng Dong Qilu Zhang Biye Ren | 2017 | Nano-Micro Letters2017，9，3： | 4 |
| 5 | Characteristics of strong motions and damage implications of M_s6.5 Ludian earthquake on August 3,2014显示文摘The Ludian County of Yunnan Province in southwestern China was struck by an MS6.5 earthquake on August 3, 2014, which was another destructive event following the MS8.0 Wenchuan earthquake in 2008, MS7.1 Yushu earthquake in 2010, and MS7.0 Lushan earthquake in 2013. National Strong-Motion Observation Network System of China collected 74 strong motion recordings,which the maximum peak ground acceleration recorded by the 053 LLT station in Longtoushan Town was 949 cm/s2 in E–W component. The observed PGAs and spectral ordinates were compared with ground-motion prediction equation in China and the NGA-West2 developed by Pacific Earthquake Engineering Researcher Center. This earthquake is considered as the first case for testing applicability of NGA-West2 in China. Results indicate that the observed PGAs and the 5 % damped pseudo-response spectral accelerations are significantly lower than the predicted ones. The field survey around some typical strong motion stations verified that the earthquake damage was consistent with the official isoseismal by China Earthquake Administration. | Peibin Xu Ruizhi Wen Hongwei Wang Kun Ji Yefei Ren | 2015 | Earthquake Science2015，28，1： | 3 |
| 6 | Comparison of strong-motion records and damage implications between the 2014 Yunnan M_S6.5 Ludian earthquake and M_S6.6 Jinggu earthquake显示文摘Serial destructive earthquakes have caused heavy casualties and economic losses to the city in southwestern of China. The Ludian M_s 6.5 earthquake and the Jinggu M_s6.6 earthquake occurred in Yunnan province in 2014. There is a question of why the two events with almost the same level of magnitude caused differences in earthquake damage. To understand the uniqueness of the phenomenon,this paper focuses on the characteristics of the ground motions and post-earthquake field investigation for the two events.Firstly, we present an overview of the residuals between the Ludian earthquake and the Jinggu earthquake based on the YW06 Ground Motion Prediction Equation(GMPE), and explain the unusual destructiveness of the strong ground motion. Then we analyze the ground motion recordings at selected typical station, based on the strong motion parameters: equivalent predominant frequency and Arias intensity. The result exhibits a good agreement with the Chinese seismic intensity scale. This study would be helpful to gain a better knowledge of the characteristics and variability of ground motions for M_S6 class earthquakes in China and to understand the implications to future earthquakes with similar focal mechanism and local condition. | Peibin Xu Ruizhi Wen Yefei Ren | 2018 | Earthquake Science2018，31，1： | 1 |
| 7 | Comparison of two great Chile tsunamis in 1960 and 2010 using numerical simulation显示文摘Great differences in hazard and losses were shown from two tsunamis,both generated in Chile,one in 1960 and the other in 2010.Numerical simulation was applied to the tsunami analysis.The fault dislocation of the seafloor was assumed to equal to the initial tsunami wave field,which can be calculated by the formula of fault dislocation in the elastic isotropic half-space.The linear long wave theory was used as the tsunami hydrodynamic model,and the finite difference method and leap-frog scheme were selected for solving the equations.The accuracy of the simulated results was verified by the observed data in five tide gauges.By means of two scenario tsunamis, the analytical results show that the earthquake magnitude,bathymetry in rupture zone and rapid release of warning information in 2010 tsunami are the main explanations of the aforementioned great difference. | Ruizhi Wen Yefei Ren Xiaojun Li Rong Pan | 2011 | Earthquake Science2011，24，5： | 1 |
| 8 | Field survey around strong motion stations and its implications on the seismic intensity in the Lushan earthquake on April 20,2013显示文摘The Ms7.0 Lushan earthquake on April 20,2013 is another destructive event in China since the Ms8.0Wenchuan earthquake in 2008 and Ms7.1 Yushu earthquake in 2010.A large number of strong motion recordings were accumulated by the National Strong Motion Observation Network System of China.The maximum peak ground acceleration(PGA)at Station 51BXD in Baoxing Country is recorded as-1,005.3 cm/s2,which is even larger than the maximum one in the Wenchuan earthquake.A field survey around three typical strong motion stations confirms that the earthquake damage is consistent with the issued map of macroseismic intensity.For the oscillation period 0.3–1.0 s which is the common natural period range of the Chinese civil building,a comparison shows that the observed response spectrums are considerably smaller than the designed values in the Chinese code and this could be one of the reasons that the macroseismic intensity is lower than what we expected despite the high amplitude of PGAs.The Housner spectral intensities from 16 stations are also basically correlated with their macroseismic intensities,and the empirical distribution of spectral intensities from Lushan and Wenchuan Earthquakes under the Chinese scale is almost identical with those under the European scale. | Yefei Ren Kun Ji Ruizhi Wen Xutao Huang | 2013 | Earthquake Science2013，26，3： | 1 |
| 9 | Experimental and numerical investigation of residual stresses around cold extrusion hole of ultrahigh strength steel显示文摘 | Chunmei Zhao Hongyan Hu Yefei Zhou Yukui Gao Xunjun Ren Qingxiang Yang | 2013 | Materials and Design2013，，： | 1 |
| 10 | Analysis of faulting destruction and water supply pipeline damage from the first mainshock of the February 6,2023 Türkiye earthquake doublet显示文摘In 2023,two consecutive earthquakes exceeding a magnitude of 7 occurred in Türkiye,causing severe casualties and economic losses.The damage to critical urban infrastructure and building structures,including highways,railroads,and water supply pipelines,was particularly severe in areas where these structures intersected the seismogenic fault.Critical infrastructure projects that traverse active faults are susceptible to the influence of fault movement,pulse velocity,and ground motions.In this study,we used a unique approach to analyze the acceleration records obtained from the seismic station array(9 strong ground motion stations)located along the East Anatolian Fault(the seismogenic fault of the MW7.8 mainshock of the 2023 Türkiye earthquake doublet).The acceleration records were filtered and integrated to obtain the velocity and displacement time histories.We used the results of an on-site investigation,jointly conducted by China Earthquake Administration and Türkiye’s AFAD,to analyze the distribution of PGA,PGV,and PGD recorded by the strong motion array of the East Anatolian Fault.We found that the maximum horizontal PGA in this earthquake was 3.0 g,and the maximum co-seismic surface displacement caused by the East Anatolian Fault rupture was 6.50 m.As the fault rupture propagated southwest,the velocity pulse caused by the directional effect of the rupture increased gradually,with the maximum PGA reaching 162.3 cm/s.We also discussed the seismic safety of critical infrastructure projects traversing active faults,using two case studies of water supply pipelines in Türkiye that were damaged by earthquakes.We used a three-dimensional finite element model of the PE(polyethylene)water pipeline at the Islahiye State Hospital and fault displacement observations obtained through on-site investigation to analyze pipeline failure mechanisms.We further investigated the effect of the fault-crossing angle on seismic safety of a pipeline,based on our analysis and the failure performance of the large-diameter Thames Water pipeline during the 1999 Kocaeli earthquake.The seismic method of buried pipelines crossing the fault was summarized. | Xiaoqing Fan Libao Zhang Juke Wang Yefei Ren Aiwen Liu | 2024 | Earthquake Science2024，37，1： | 0 |
| 11 | 采用强震动记录确定2013年芦山余震的破裂方向性显示文摘地震动的方向性效应在分析震源物理及活断层附近的地震危险性方面有广泛的影响。由于受到观测台站方位角的限制,详细地确定小地震的破裂方向性存在一定困难。在2013年4月20日和21日的4次震级较大的芦山余震(分别记为事件1,事件2,事件3,事件4)中,中国数字强震动台网收集了大量强震动记录。这4次芦山余震震源位置靠近且震级相近,但触发的强震动台站空间分布有显著差异。通过分析地震动参数,包括峰值、反应谱和持时,认为事件2和事件3的地震动有明显的方向性效应。采用傅里叶谱比方法证实了破裂方向性的存在,通过反演峰值参数确定了震源破裂方向和破裂速度,并用多次随机反演过程来分析反演结果的不确定性。结果表明,这4次余震有相近的北东-南西走向的破裂面,且震源破裂速度接近,大约为2.1km/s。尽管反演结果存在不确定性,但事件1为对称双向破裂的可能性很高,事件2和事件3的主破裂方向为西南方向,事件4近似为对称双向破裂,略偏向东北方向。破裂方向性效应与周期的相关性也得到了证实。 | Ruizhi Wen Hongwei Wang Yefei Ren 张颖楚 | 2016 | 世界地震译丛2016，47，6： | 0 |
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