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Earthquake Engineering and Engineering Vibration 2011年第3期10卷 325-337页

作者： wen ruizhi Ren Yefei Shi Dacheng Institute of Engineering Mechanics China Earthquake Administration Harbin 150080 China

Local site conditions play an important role in the effective application of strong motion *** 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 *** 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 ***,a new method for site classification based on the entropy weight theory is *** proposed method avoids the head or tail joggle phenomenon by providing the objective and subjective *** 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 *** results show that the improved HVSR method proposed in this paper has a higher success rate and could be adopted in NSMONS.

关键词： site classification strong motion recording entropy weight theory horizontal-to-vertical spectrum ratio wenchuan earthquake aftershock head-tail joggle

Efficient simulation of spatially correlated non-stationary ground motions by wavelet-packet algorithm and spectral representation method

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Earthquake Engineering and Engineering Vibration 2024年第4期23卷 799-814页

作者： Ji Kun Cao Xuyang Wang Suyang wen ruizhi College of Civil and Transportation Engineering Hohai UniversityNanjing 210098China The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of TechnologyBeijing 100022China Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin 150080China Key Laboratory of Earthquake Disaster Mitigation Ministry of Emergency ManagementHarbin 150080China

Although the classical spectral representation method(SRM)has been widely used in the generation of spatially varying ground motions,there are still challenges in efficient simulation of the non-stationary stochastic vector process in *** first problem is the inherent limitation and inflexibility of the deterministic time/frequency modulation *** difficulty is the estimation of evolutionary power spectral density(EPSD)with quite a few *** tackle these problems,the wavelet packet transform(WPT)algorithm is utilized to build a time-varying spectrum of seed recording which describes the energy distribution in the time-frequency *** time-varying spectrum is proven to preserve the time and frequency marginal property as theoretical EPSD will do for the stationary *** the simulation of spatially varying ground motions,the auto-EPSD for all locations is directly estimated using the time-varying spectrum of seed recording rather than matching predefined EPSD *** the constructed spectral matrix is incorporated in SRM to simulate spatially varying non-stationary ground motions using efficient Cholesky decomposition *** addition to a good match with the target coherency model,two numerical examples indicate that the generated time histories retain the physical properties of the prescribed seed recording,including waveform,temporal/spectral non-stationarity,normalized energy buildup,and significant duration.

关键词： non-stationarity time-varying spectrum wavelet packet transform(WPT) spectral representation method(SRM) response spectrum spatially varying recordings

Site effects by generalized inversion technique using strong motion recordings of the 2008 wenchuan earthquake

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Earthquake Engineering and Engineering Vibration 2013年第2期12卷 165-184页

作者： Ren Yefei wen ruizhi Hiroaki Yamanaka Toshihide Kashima Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake Administration Tokyo Institute of Technology Building Research Institute

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 F and the average site amplification in different frequency bands of 1.0-5.0 Hz, 5.0-10.0 Hz 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 V20 （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 ofPGA 〉 300 cm/s^2 or PGV 〉 20 cm/s, and only one station coded 51SFB has evidence of soil nonlinear behavior in the aftershocks.

关键词： generalized inversion technique site effect wenchuan earthquake soil nonlinearity predominant frequency site amplification

Ground-motion simulation for the MW6.1 Ludian earthquake on 3 August 2014 using the stochastic finite-fault method

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Earthquake Science 2019年第3期32卷 101-114页

作者： Hongwei Wang ruizhi wen Institute of Engineering Mechanics China Earthquake AdministrationHarbin 150080China Key Laboratory of Earthquake Engineering and Engineering Vibration China Earthquake AdministrationHarbin 150080China

The stochastic finite-fault simulation method was applied to synthesize the horizontal ground acceleration seismograms produced by the MW6.1 Ludian earthquake on August 3,*** this purpose,we produced first a total of 200 kinematic source models for the Ludian event,which are characterized by the heterogeneous slip on the conjugated ruptured fault and the slip-dependent spreading of the rupture *** results indicated that the heterogeneous slip and the spatial extent of the ruptured fault play dominant roles in the spatial distribution of ground motions in the near-fault *** peak ground accelerations(PGAs)and 5%-damped pseudospectral accelerations(PSAs)at periods shorter than 0.5 s estimated on the resulting synthetics generally match well with the observations at stations with Joyner-Boore distances(RJB)greater than 20 *** synthetic PGVs and PSAs at periods of 0.5 s and 0.75 s are in good agreement with predicted medians by the Yu14 model(Yu et al.,2014).However,the synthetic results are generally much lower than the predicted medians by BSSA14 model(Boore et al.,2014).Moreover,the ground motion variability caused by the randomness in the source rupture process was evaluated by these *** standard deviations of PSAs on the base-10 logarithmic scale,Sigma[log10(PSA)],are closely dependent on either the spectral period or the *** Sigma[log10(PSA)]remains a constant approximately 0.55 at periods shorter than 0.1 s,and then increase continuously up to^0.13 as the period increases from 0.1 to 2.0 *** Sigma[log10(PSA)]values at periods of 0.1‒2.0 s show the downward tendency as the RJB values ***,the Sigma[log10(PSA)]values at periods shorter than 0.1 s decrease as the RJB values increase up to^50 km,and then increase with the increasing ***,we found that the ground-motion variability shows the significant dependence on the azimuth.

关键词： Ludian earthquake kinematic source model stochastic finite-fault simulation ground motion variability

Comparison of strong-motion records and damage implications between the 2014 Yunnan M_S6.5 Ludian earthquake and M_S6.6 Jinggu earthquake

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Earthquake Science 2018年第1期31卷 12-18页

作者： Peibin Xu ruizhi wen Yefei Ren Institute of Engineering Mechanics China Earthquake Administration

Serial destructive earthquakes have caused heavy casualties and economic losses to the city in southwestern of China. The Ludian Ms 6.5 earthquake and the Jinggu Ms 6.6 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 Ms6 class earthquakes in China and to understand the implications to future earthquakes with similar focal mechanism and local condition.

关键词： Ludian earthquake Jinggu earthquake ground motion prediction equation earthquake damage

Comparison of two great Chile tsunamis in 1960 and 2010 using numerical simulation

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Earthquake Science 2011年第5期24卷 475-483页

作者： ruizhi wen Yefei Ren Xiaojun Li Rong Pan Institute of Engineering Mechanics China Earthquake Administration Harbin 150080 China Institute of Geophysics China Earthquake Administration Beijing 100081 China Nuclear and Radiation Safety Center Ministry of Environmental Protection Beijing 100082 China

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 seafioor 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.

关键词： Chile earthquake tsunami numerical simulation

Preliminary site classification of free-field strong motion stations based on wenchuan earthquake records

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Earthquake Science 2010年第1期23卷 101-110页

作者： ruizhi wen Yefei Ren Zhenghua Zhou Dacheng Shi Institute of Engineering Mechanics China Earthquake Administration Harbin 150080 China College of Architecture and Civil Engineering Beijing University of Technology Beo'ing 100022 China

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.

关键词： site classification wenchuan earthquake strong motion station acceleration record

Preface to the special issue on ground motion input at dam sites and reservoir earthquakes

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Earthquake Science 2022年第5期35卷 311-313页

作者： Ruifang Yu Xiao Hu ruizhi wen Institute of Geophysics China Earthquake AdministrationBeijing 10081China Earthquake Engineering Research Center China Institute of Water Resources and Hydropower ResearchBeijing 100048China Insitutite of Engineering Mechanics China Earthquake AdministrationHarbin 150080China

The distribution of water resources in China exhibits significant spatial-temporal ***,constructing large dams and reservoirs is indispensable for rationally deploying water resources to ensure China’s water security and prevent water-related *** infrastructure is also fundamental for harnessing renewable hydropower resources to reduce carbon dioxide emissions and achieve the carbon-neutral goal.

关键词： reservoir reservoirs ground

Spatial correlations in ground motion intensity measuring from the 2023 Türkiye earthquake

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Earthquake Research Advances 2024年第1期4卷 14-22页

作者： Guoliang Shao ruizhi wen Hongwei Wang Yeifei Ren Baofeng Zhou Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin150080 China Key Laboratory of Earthquake Disaster Mitigation Ministry of Emergency ManagementHarbin150080 China

When evaluating an area's seismic risk or resilience,it is necessary to use the spatial correlation to analyze the ground motion parameters of multiple sites together in an *** two large earthquakes in Türkiye provided the possibility for spatial correlation analysis of ground motion intensity measurements in this *** on the strong motion records provided by The Disaster and Emergency Management Authority of Türkiye(AFAD),this study uses the local ground motion prediction equation in Türkiye to give spatial correlation analysis of Intensity *** study gives an exponential model based on a semivariogram and compares it with the correlation model obtained from previous studies.

关键词： Spatial correlation Semi-variance Türkiye GMPE

Strong motion observations and recordings from the great wenchuan Earthquake

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Earthquake Engineering and Engineering Vibration 2008年第3期7卷 235-246页

作者： Li Xiaojun Zhou Zhenghua Yu Haiyin wen ruizhi Lu Dawei Huang Moh Zhou Yongnian Cu Jianwen Institute of Engineering Mechanics China Earthquake Administration Harbin 150080 China National Earthquake Infrastructure Service Beijing China California Geological Survey Sacramento USA Yunnan Provincial Earthquake Administration Kunming China

The National Strong Motion Observation Network System （NSMONS） of China is briefly introduced in this paper. The NSMONS consists of permanent free-field stations, special observation arrays, mobile observatories and a network management system. During the wenchuan Earthquake, over 1,400 components of acceleration records were obtained from 460 permanent free-field stations and three arrays for topographical effect and structural response observation in the network system from the main shock, and over 20,000 components of acceleration records from strong aftershocks occurred before August 1, 2008 were also obtained by permanent free-field stations of the NSMONS and 59 mobile instruments quickly deployed after the main shock. The strong motion recordings from the main shock and strong aftershocks are summarized in this paper. In the ground motion recordings, there are over 560 components with peak ground acceleration （PGA） over 10 Gal, the largest being 957.7 Gal. The largest PGA recorded during the aftershock exceeds 300 Gal.

关键词： wenchuan Earthquake strong motion observation network mobile observation observation array strong motion record PGA