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Improved HVSR site classification method for free-field strong motion stations validated with Wenchuan aftershock recordings

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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

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

Geomorphological site classification for the Fujian province

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Earthquake Science 2013年第1期26卷 49-54页

作者： Yao Ke Shichun Zheng Zhao Huang Shanxiong Wang Jiafang Huang Earthquake Administration of Fujian Province College of Geographical Sciences Fujian Normal University

Geomorphological classification of the Fujian province was done based on remote-sensing imaging, digital elevation maps, and slope gradient data acquired by ArcGIS 9.2. The engineering geological units in the Fujian province were divided into five types by the geomorphologic shape and genesis. The relationship among geomorphological type, engineering geological unit, and site category was determined using engineering geological data and site category data. Then, after making a preliminary site classification adjusted by drill hole data, the site was classified into four types： Ⅰ0, Ⅰ1, Ⅱ, and Ⅲaccording to site classification standards of equivalent shear-wave velocity and overburden thickness. The results showed that the site categories in the Fujian province mainly consist of type Ⅱ, which accounts for 85.26 % of the land area. The percentage of Io was the smallest, which accounts for only 2.44 % of the total area.

关键词： site classification Geomorphologicalclassification ·GIS ·Fujian province

Design and Application of a Digital classification Instrument for Engineering site Seism-resistant Design

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Design and Application of a Digital Classification Instrumen...

A Seismic Hazard Map Based on Geology and Shear-wave Velocity in Rawalpindi–Islamabad,Pakistan

2010 Chinese Control and Decision Conference

作者： Tiansong Zhai~1,Shujun Liu~1,Shihai Zhang~(1,2) 1.Department of Electronics and Electrical Engineering,Nanyang Institute of Technology,Nanyang,473004,China 2.School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China

Considering the fuzzy features of the construction site,combining with standard site classification and their feature period isoline diagrams classified by current seism-resistant code,the two-dimension membership function expressions about the four classes of site classification based on equivalent cut wave speed(v) and covering layer thickness(d) was ***,based on MCU technology,a sit classification instrument for seism-resistant design is developed using the fuzzy membership *** the instrument we can obtain the results of site continuous classification through fuzzy processing and defuzzification for site *** continuous characteristic period of site can be achieved by selection the classification of design *** cases show that this method can get more precise results of continuous *** results around the boundary region are flatter and overcome the break of site *** characteristic period obtained by the instrument agree well with the isoline of current seism-resistant *** lays a foundation for seism-resistant design projects to objectively determine site classification and take reasonable seism-resistant policy.

关键词： Seism-resistant Design site classification Two-dimensional Membership Function MCU Technology Digital classification Instrument

来源： cnki会议评论

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Acta Geologica Sinica(English Edition) 2021年第2期95卷 659-673页

作者： Sarfraz KHAN Muhammad WASEEM M.Asif KHAN National Centre of Excellence in Geology University of Peshawar 25130KPPakistan University of Peshawar 25120 KPPakistan

The‘twin cities’district of Rawalpindi–Islamabad is among the most endangered seismic regions in Pakistan,with the seismic hazard assessed(0.32 g)to intensity IX MMI for a 475-year return period.A seismic hazard map for Rawalpindi–Islamabad is presented herein,based on 85 shear-wave velocity(VS)profiles obtained through geophysical H/V measurements and from the geological map of the *** between the average top thirty-meter shear-wave velocities(VS30)and surficial geological units have been *** peak ground acceleration(PGA)maps for 150,475 and 2475-year return periods were converted into a seismic intensity *** increments for different soils were used to compute PGA values for 150,475 and 2475-year return *** located on softer ground experienced a higher degree of damage from moderate *** to the presence of soft clay or liquefiable soil and lateral spreading,a few locations may be classified as hybrid sites class C and *** map is a critical step in facilitating code-based site classification and seismic design throughout Rawalpindi–*** the seismic hazard map based on seismic intensities is no longer used in engineering geology,it is still important in seismological analysis and for civil protection purposes.

关键词： seismic hazard site classification intensity increment engineering geology Rawalpindi-Islamabad

STUDY ON THE site OF KOREAN PINE PLANTATION ON THE MAOER MOUNTAIN

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Journal of Northeast Forestry University 1994年第2期5卷 29-36页

作者：宫伟光 Northeast Forestry University China

The site classification and site quality evaluation were studied in Korean pine (Pinus koraiends) plantations on the Maoer Mountain. All the Korean pine plantation were classified into 3 site classes including 13. site types, based on the three key site factors of soil type, humus horizon depth and aspect, which affect the growth of Korean Pine tree. Multiple regression eqwtion related to site facors and dominant tree height was developed by using the Numeral Model I for site quality evaluation of Korean pine plantation. A table of site quality evalwtion was mede on the basis of the table of forest site type and the dominant tree height predicting equation of Korean pine plantation.

关键词： Korean pine Plantation site classification

Simulation of scenario earthquake influenced field by using GIS

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Acta Seismologica Sinica(English Edition) 1999年第4期12卷 475-480,495页

作者：左惠强谢礼立 Institute of Geophysics China Seismological Bureau Beijing China Institute of Engineering Mechanics China Seismological Bureau Harbin China US Geological Survey Menlo Park

The method for estimating the site effect on groundmotion specified by Borcherdt (1994a, 1994b) is briefly introducedin the paper. This method and the detail geological data and site classification data in San Francisco bay area ofCalifornia, the United States. are applied to simulate the influenced field of scenario earthquake by GIS technology,and the software for simulating has been drawn up. The paper is a partial result of cooperative research project betweenChina Seismological Bureau and US Geological Survey.

关键词： site classification site effect GIS simulation of influenced field

site coefficients suitable to China site category

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Acta Seismologica Sinica(English Edition) 2007年第1期20卷 71-79页

作者：吕红山赵凤新 Institute of Geophysics China Earthquake Administration Beijing 100081 China

The basis for the NEHRP site coefficients is summarized in the paper. The comparison of site classification between China and US code provisions has been carried out. The relationship between two site classifications has been found by the analysis of wave velocity of site soil. Thus amplitude-dependent site amplification factors for China site classification has been gained by transformation from US amplification factors. Two amplification factors are specified： Fa for short periods and Fv for longer periods. On the contrast, there is only one long period factor and not a short period factor in the current China code provision.

关键词： site coefficients site classification seismic code average shear-wave velocity

Soft Soil site Characterization on the Coast of Yantai and Its Effect on Ground Motion Parameters

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Earthquake Research in China 2005年第2期19卷 116-124页

作者： Lü Yuejun Tang Rongyu Peng Yanju Institute of Crustal Dynamics China Earthquake Administration Beijing 100085 China

According to the Chinese GB50011-2001 code and the recommended provisions of FEMANEHRP and EUROCODE 8, by using shear wave velocity and borehole data, the site classification is evaluated for a typical soft soil site on the Yantai seacoast. The site seismic ground motion effect is analyzed and the influence of the coastal soil on design ground motion parameters is discussed. The results show that the brief site classification can not represent the real conditions of a soft soil site; the soft soil on the coast has a remarkable impact on the magnitude and spectrum of ground motion acceleration. The magnification on peak acceleration is bigger, however, due to the nonlinear deformation of the soil. The magnification is reduced noulinearly with the increase of input ground motion; the spectrum is broadened and the characteristic period elongated on the soft soil site.

关键词： site classification Shear wave velocity Earthquake ground motion Yantai