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Seismic hazard analysis of Tianjin area based on strong ground motion prediction

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Earthquake Science 2010年第4期23卷 369-375页

作者： Zhao Boming School of Civil Engineering Beijing Jiaotong University Beijing 100044 China

Taking Tianjin as an example, this paper proposed a methodology and process for evaluating near-fault strong ground motions from future earthquakes to mitigate earthquake damage for the metropolitan area and important engineering structures. The result of strong ground motion was predicted for Tianjin main faults by the hybrid method which mainly con- sists of 3D finite difference method and stochastic Green＇s function. Simulation is performed for 3D structures of Tianjin re- gion and characterized asperity models. The characterized asperity model describing source heterogeneity is introduced fol- lowing the fault information from the project of Tianjin Active Faults and Seismic Hazard Assessment. We simulated the worst case that two earthquakes separately occur. The results indicate that the fault position, rupture process and the sedi- mentary deposits of the basin significantly affect amplification of the simulated ground motion. Our results also demonstrate the possibility of practical simulating wave propagation including basin induced surface waves in broad frequency-band, for seismic hazard analysis near the fault from future earthquakes in urbanized areas.

关键词： 3D finite difference stochastic Green's function active fault strong ground motion Tianjin area

A stochastic model of the Fourier phase of strong ground motion

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Acta Seismologica Sinica(English Edition) 1995年第3期8卷 435-446页

作者：廖振鹏金星 1. Institute of Engineering Mechanics State Seismological Bureau 150080 Harbin China

The notion of equivalent dispersion of strong seismic waves is further illuminated and a frequency-dependentstochastic model of the Fourier phase of strong earthquake ground motion is presented for use in statistical estimates of the Fourier phase. The non-stationary features of design ground motions synthesized using the phasemodel in combination with the empirical attenuation model of amplitude spectra of strong ground motion are ableto be consistent with those of observed records in the sense of statistics.

关键词： phase analysis stocbastic model strong ground motion equivalent dispersion

Real-time Monitoring of strong ground motion using 50Hz GNSS Data of Continuous Operation Reference Station （CORS）

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Real-time Monitoring of Strong Ground Motion using 50Hz GNSS...

Simulation of Near-Fault strong ground motion in the Beijing Region

第五届中国卫星导航学术年会

作者： Zhang Xi Huang Dingfa Liao Hua Feng Wei Li Meng School of Geosciences and Environmental Engineering Southwest Jiaotong University Sichuan Earthquake Administration

ISBN: (纸本)9783642547393

High-rate GNSS plays an important role in monitoring the process of strong ground motion, such as seismic activity. To achieve real-time monitoring, a reasonable solution and filtering method are needed, especially for the 50Hz data. Based on the analysis of differential and combination method, effects of ionosphere and troposphere have obvious trend within a short time, but cannot be treated as linear trend completely. To monitor real time surface deformation accurately, a newly developed strategy is proposed in this paper, it can effectively reduce atmospheric error of double-difference in real-time. 50Hz data are obtained during Lushan earthquake （Ms7.0）, Sichuan, China;the coseismic deformations are captured successfully on the sites of CORS stations. With 3D grid searching method, the obtained earthquake focus is basically consistent with USGS published results. It shows that the proposed method is effective and reasonable for strong ground motion monitoring by using high-rate GNSS observations, especially for seismic activity.

关键词： CORS High-rate GNSS Morphological Filtering Sliding Monitoring Model strong ground motion Coseismic Deformation

来源： cnki会议评论

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Earthquake Research in China 2007年第3期21卷 281-292页

作者： Pan Bo Xu Jiandong Haruko Sekigguchi He Honglin Institute of Geology China Earthquake Administration Beijing 100029 China Active Fault Research Center Tsukuba Ibaraki 305-8567 Japan

On the basis of previous study of the 1679 Sanhe-Pinggu(M8.0) earthquake,the biggest event in history ever recorded in Beijing and its adjacent area,we made a 3-D strong ground motion simulation utilizing the staggered-grid finite differences method to study the distributions of peak ground velocity with different earthquake source models in the Beijing *** the paper,earthquake source models and a transmission medium velocity model are established and the corresponding parameters are given in accordance to the results from a related previous ***,using a three-dimensional finite difference computing program of near-fault strong ground motion developed by Graves,the peak ground velocity caused by a destructive earthquake in the Beijing area is *** our computation model,the earthquake source is 3km in depth,and a total number of 21,679 observation points on the ground surface are figured *** transmission medium velocity model is composed of four stratums which are the Quaternary deposit,the upper crust,the upper part of the middle crust and the lower part of the middle *** the minimum grid spacing of 0.15km,a total of 2.28×106 grids are *** a time step of 0.02 seconds we calculated the peak ground velocity for a duration of 8 *** the analysis of the simulation results,we observed some basic characteristics of near-fault strong ground motion such as the concentration effect of near-fault peak ground velocity,rupture directivity effect,hanging wall effect,and basin *** results from our simulation and analysis suggest that the source and transmitting medium parameters in our model are suitable and the finite difference method is applicable to estimate the distribution of strong ground motion in the study region.

关键词： strong ground motion Source parameter Transmitting medium parameter Concentration effect Rupture directivity effect Hanging wall effect, basin effect

Suitable triggering algorithms for detecting strong ground motions using MEMS accelerometers

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Earthquake Engineering and Engineering Vibration 2015年第1期14卷 27-35页

作者： Ravi Sankar Jakka Siddharth Garg Department of Earthquake Engineering Indian Institute of Technology

With the recent development of digital Micro Electro Mechanical System （MEMS） sensors, the cost of monitoring and detecting seismic events in real time can be greatly reduced. Ability of MEMS accelerograph to record a seismic event depends upon the efficiency of triggering algorithm, apart from the sensor＇s sensitivity. There are several classic triggering algorithms developed to detect seismic events, ranging from basic amplitude threshold to more sophisticated pattern recognition. Algorithms based on STA/LTA are reported to be computationally efficient for real time monitoring. In this paper, we analyzed several STA/LTA algorithms to check their efficiency and suitability using data obtained from the Quake Catcher Network （network of MEMS accelerometer stations）. We found that most of the STA/LTA algorithms are suitable for use with MEMS accelerometer data to accurately detect seismic events. However, the efficiency of any particular algorithm is found to be dependent on the parameter set used （i.e., window width of STA, LTA and threshold level）.

关键词： strong ground motion triggering algorithms seismic event detection MEMS accelerometers STA/LTA based algorithms

ground motion prediction equations based on shallow crustal earthquakes in Georgia and the surrounding Caucasus

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Earthquake Science 2022年第6期35卷 497-509页

作者： Jorjiashvili Nato Shengelia Ia Godoladze Tea Gunia Irakli Akubardia Dimitri Institute of Earth Sciences and National Seismic Monitoring Center Ilia State UniversityTbilisi 0177Georgia

strong ground motions caused by earthquakes with magnitudes ranging from 3.5 to 6.9 and hypocentral distances of up to 300km were recorded by local broadband stations and three-component accelerograms within Georgia’s enhanced digital seismic *** data mixing is particularly effective in areas where strong ground motion data are *** data were used to produce models based on ground-motion prediction equations(GMPEs),one benefit of which is that they take into consideration information from waveforms across a wide range of *** this study,models were developed to predict ground motions for peak ground acceleration and 5%-damped pseudo-absolute-acceleration spectra for periods between 0.01 and 10 ***-period ground motions decayed faster than long-period motions,though decay was still in the order of approximately 1/*** mechanisms and local soil conditions greatly influence *** spectral acceleration(SA)of thrust faults was higher than that for either strike-slip or normal faults but the influence of strike-slip faulting on SA was slightly greater than that for normal *** soils also caused significantly more amplification than rocky sites.

关键词： strong ground motion peak ground acceleration spectral acceleration shallow earthquake

Study on strength reduction factors consid-ering the effect of classification of design earthquake

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Acta Seismologica Sinica(English Edition) 2006年第3期19卷 299-310页

作者：翟长海谢礼立 School of Civil Engineering Harbin Institute of Technology Harbin 150090 China School of Civil Engineering Harbin Institute of Technology Harbin 150090 China Institute of Engineering Mechanics China Earthquake Administration Harbin 150080 China

The strength reduction factors are not only the key factors in determining seismic action for force-based seismic design, but also the key parameters to derive the inelastic response spectra for performance-based seismic design. In this paper, with a high quality ground motion database that includes a reasonable-sized set of records from China, a statistical study on the strength reduction factors is conducted and a new expression of strength reduction factors involving classification of design earthquake, which is an important concept to determine design spectra in Chinese seismic design code, is proposed. The expression of strength reduction factors can reflect the ground motion characteristics of China to a certain extent and is particularly suitable for Chinese seismic design. Then, the influence effects of site condition, classification of design earthquake, period of vibration, ductility level, earthquake magnitude and distance to fault on strength reduction factors are investigated. It is concluded that the effect of site condition on the strength reduction factors cannot be neglected, especially for the short-period structures of higher ductility. The classification of design earthquake also has an important effect on strength reduction factors and it may be unsuitable to use the existing expressions of strength reduction factors to the design spectra of current Chinese seismic code. The earthquake magnitude has no practical effect on strength reduction factors and if the near-fault records with forward directivity effect are not taken into consideration, the effect of distance to fault on strength reduction factors can also be neglected.

关键词： strength reduction factor site condition classification of design earthquake strong ground motion regression analysis

Parametric study on collapse margin ratio of structure

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Journal of Central South University 2014年第6期21卷 2477-2486页

作者：欧晓英何政欧进萍 Department of Civil Engineering Dalian University of Technology

The determination of collapse margin ratio(CMR)of structure is influenced by many uncertain *** factors that can affect the calculation of CMR,e.g.,the elongation of the structural fundamental period prior to collapse,the determination of earthquake intensity measure,the seismic hazard probability,and the difference of the spectral shapes between the median spectrum of the ground motions and the design spectrum,were *** the elongation of the structural fundamental period,the intensity measure Sa(T1)should be replaced with *aS in the calculation of CMR for short-period and medium-period *** reasonable intensity measure should be determined by the correlation analysis between the earthquake intensity measure and the damage index of the ***,CMR should be adjusted according to the seismic hazard probability and the difference in the spectral *** important long-period structures,CMR should be determined by the special site *** results indicate that both Sa(T1)and spectrum intensity(SI)could be used as intensity measures in the calculation of CMR for medium-period structures,but SI would be a better choice for long-period ***,an adjusted CMR that reflects the actual seismic collapse safety of structures is provided.

关键词： collapse margin ratio strong ground motion intensity measurement probability of exceedance Housner's spectrum intensity spectrum acceleration

Attenuation characteristics of peak acceleration in North China and comparison with those in the eastern part of North America

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Acta Seismologica Sinica(English Edition) 1999年第1期12卷 26-34页

作者：王碧泉吴大铭边银菊 Institute of Geophysics China Seismological Bureau Beijing 100081 China State University of New York Binghamton N.Y. U.S.A

Using the strong motion records of Tangshan strong aftershocks, the attenuation characteristics of horizontal peak accelerations of strong motion in near field are studied in this paper and the attenuation relations (soil, soil and rock) in Tangshan area are obtained. Besides, we have obtained the attenuation relation in the eastern part of North America, and comparing it with those in North China. We think both of the attenuation tendencies are consistent and the attenuation characteristics in North China can give a reference to the ones in the eastern part of North America.

关键词： strong ground motion attenuation Tangshan earthquake