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site amplification effects as an explanation for the intensity anomaly in the Hanyuan Town during the Wenchuan Mw 7.9 earthquake

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Earthquake Engineering and Engineering Vibration 2016年第3期15卷 435-444页

作者： Liu Hongshuai Bo Jingshan Li Ping QiWenhao Zhang Yudong National Earthquake Infrastructure Service Beijing 100036China Institute of Disaster Prevention Sanhe 065201China Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering Mechanics China Earthquake AdministrationHarbin 150080China

The Hanyuan Town is located approximately 200 km from the macro-epicenter of the great Wenchuan earthquake. However, it is within the only Intensity VIII zone, surrounded by a region of Intensity VI. The objective of this study was to investigate this high-intensity anomaly with respect to the site amplifications in the Hanyuan Town. The base inputs were derived from the records at a nearby strong-motion station because no records were available from the town. The characteristics of the subsurface formations and their dynamic properties at a typical site in the town were obtained by drilling, field tests and laboratory tests. Seismic response and parametric sensitivity analyses of the site were conducted using Shake 91, and the results were compared with the provisions for rare earthquakes from the Chinese Code for Seismic Design of Buildings （GBJ11-89）. The results showed that the average peak acceleration at the site during the Wenchuan earthquake is similar to the code-specified value under rare earthquakes, that the corresponding spectral accelerations for periods betwcen approximately 0.35 and 0.75 s are significantly stronger than those specified by the code and that the average amplification factor at the site is significantly higher than the mean value of the site class. These findings indicate that the high-intensity anomaly in the town was primarily caused by site amplification effects from the unique structure of the soil strata.

关键词： Wenchuan earthquake Hanyuan Town high-intensity anomaly site amplification rare earthquake

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site amplification in the Lijiang Valley,Yunnan Province

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Acta Seismologica Sinica(English Edition) 1999年第2期12卷 193-198页

作者：李白基秦嘉政罗娣华叶建庆陈敏恭蔡绍平刘学军 The Western Yunnan Earthquake Prediction Study Area China Seismological Bureau Kunming China

The site amplifications for three stations, Libin (LIBI), Baisha (BASH) and Yulong (YULG) situated respectivelyin the southern, middle and northern parts of Lijiang Valley, are obtained by analyzing the S-wave soil/bedrockand microtremor horizontal/vertical spectral ratios. The data are digital recordings for the aftershocks of the Lijiang Ms=7.0 earthquake on February 3, 1996. In the frequency range of 1-4 Hi, the S-wave soil/bedrock spectralratio of E-W component for LIBI is the largest and amounts to 4.5. The microtremor soil N-S/vertical (V) spectralratio is approximate to l, E-W/V is about 4.5 and the same with above soil/bedrock spectral ratio. It is shown thatthe vertical and N-S components of microtremor have not been amplified by the soil and the Nakamura's method isapplicable. With this method, the microtremor spectral ratios for BASH and YULG are further evaluated. Theyhave similar characteristics with that of LIBI. In above frequency range, both N-S/V ratios are approximate to 1,while the E-W/V ratio is about 6 for BASH, 4.5 for YULG. Ljiang Valley is characterized by the trans-valleydirectional site response.

关键词： site amplification spectral ratio microtremor Lijiang

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Parallel finite element modeling of earthquake ground response and liquefaction

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Earthquake Engineering and Engineering Vibration 2004年第1期3卷 23-37页

作者：陆金池彭军 Ahmed Elgamal 杨朝晖 Kincho H.Law Department of Structural Engineering University of California Department of Civil and Enviromental Engineering Stanford University Department of Civil and Enviromental Engineering Stanford University

Parallel computing is a promising approach to alleviate the computational demand in conducting large-scale finite element *** paper presents a numerical modeling approach for earthquake ground response and liquefaction using the parallel nonlinear finite element program,ParCYCLIC,designed for distributed-memory message-passing parallel computer *** ParCYCLIC,finite elements are employed within an incremental plasticity,coupled solid-fluid formulation,A constitutive model calibrated by physical tests represents the salient characteristics of sand liquefaction and associated accumulation of shear *** elements of the computational strategy employed in ParCYCLIC include the development of a parallel sparse direct solver,the deployment of an automatic domain decomposer,and the use of the Multilevel Nested Dissection algorithm for ordering of the finite element *** results of centrifuge test models using ParCYCLIC are *** results from grid models and geotechnical simulations show that ParCYCLIC is efficiently scalable to a large number of processors.

关键词： parallel finite element domain decomposition liquefaction parallel speedup earthquake site amplification

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Three-Dimensional Modeling of Shallow Shear-Wave Velocities for Las Vegas, Nevada, Using Sediment Type

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Journal of China University of Geosciences 2009年第3期20卷 555-562页

作者： Barbara Luke Helena Murvosh Wanda Taylor Jeff Wagoner University of Nevada Las Vegas Las Vegas NV USA Stanley Consultants Inc. Las Vegas NV USA Lawrence Livermore National Laboratory Livermore CA USA

A three-dimensional model of near-surface shear-wave velocity in the deep alluvial basin underlying the metropolitan area of Las Vegas, Nevada （USA）, is being developed for earthquake site response projections. The velocity dataset, which includes 230 measurements, is interpolated across the model using depth-dependent correlations of velocity with sediment type. The sediment-type database contains more than 1 400 well and borehole logs. Sediment sequences reported in logs are assigned to one of four units. A characteristic shear-wave velocity profile is developed for each unit by analyzing closely spaced pairs of velocity profiles and well or borehole logs. The resulting velocity model exhibits reasonable values and patterns, although it does not explicitly honor the measured shear-wave velocity profiles. site response investigations that applied a preliminary version of the velocity model support a two-zone ground-shaking hazard model for the valley. Areas in which clay predominates in the upper 30 m are predicted to have stronger ground motions than the rest of the basin.

关键词： shear-wave velocity earthquake site response site amplification microzonation sediment type.

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