scholarly journals Study on the Ground Motion Parameter Microzonation for Cities in the Flat—Taking Gaoyou City as an Example

2017 ◽  
Vol 07 (09) ◽  
pp. 261-269
Author(s):  
小三 陶
Keyword(s):  
Ground Motion ◽  
Motion Parameter ◽  
Ground Motion Parameter

scholarly journals Seismic hazard map of North and Central America and the Caribbean

1999 ◽  
Vol 42 (6) ◽  
Author(s):  
K. M. Shedlock
Keyword(s):  
Seismic Hazard ◽  
Central America ◽  
Ground Motion ◽  
Emergency Response ◽  
Motion Parameter ◽  
Hazard Map ◽  
Ground Motion Parameter ◽  
Short Period ◽  
The Caribbean ◽  
Seismic Hazard Map

Minimization of the loss of life, property damage, and social and economic disruption due to earthquakes depends on reliable estimates of seismic hazard. National, state, and local governments, decision makers, engineers, planners, emergency response organizations, builders, universities, and the general public require seismic hazard estimates for land use planning, improved building design and construction (including adoption of building construction codes), emergency response preparedness plans, economic forecasts, housing and employment decisions, and many more types of risk mitigation. The seismic hazard map of North and Central America and the Caribbean is the concatenation of various national and regional maps, involving a suite of approaches. The combined maps and documentation provide a useful regional seismic hazard framework and serve as a resource for any national or regional agency for further detailed studies applicable to their needs. This seismic hazard map depicts Peak Ground Acceleration (PGA) with a 10% chance of exceedance in 50 years. PGA, a short-period ground motion parameter that is proportional to force, is the most commonly mapped ground motion parameter because current building codes that include seismic provisions specify the horizontal force a building should be able to withstand during an earthquake. This seismic hazard map of North and Central America and the Caribbean depicts the likely level of short-period ground motion from earthquakes in a fifty-year window. Short-period ground motions effect short-period structures (e.g., one-to-two story buildings). The highest seismic hazard values in the region generally occur in areas that have been, or are likely to be, the sites of the largest plate boundary earthquakes.

Probabilistic assessment of earthquake-induced sliding displacements of natural slopes

2009 ◽  
Vol 42 (1) ◽  
pp. 18-27 ◽  
Author(s):  
Ellen M. Rathje ◽  
Gokhan Saygili
Keyword(s):  
Ground Motion ◽  
Peak Ground Acceleration ◽  
Earthquake Magnitude ◽  
Motion Parameter ◽  
Peak Ground Velocity ◽  
Vector Model ◽  
Probabilistic Framework ◽  
Ground Acceleration ◽  
Ground Motion Parameter ◽  
Natural Slopes

The evaluation of earthquake-induced landslides in natural slopes is often based on an estimate of the permanent sliding displacement due to earthquake shaking. Current procedures for estimating sliding displacement do not rigorously account for the significant uncertainties present in the analysis. This paper presents a probabilistic framework for computing the annual rate of exceedance of different levels of displacement such that a hazard curve for sliding displacement can be developed. The analysis incorporates the uncertainties in the prediction of earthquake ground shaking, in the prediction of sliding displacement, and in the assessment of soil properties. Predictive models for sliding displacement that are appropriate for the probabilistic framework are presented. These models include a scalar model that predicts sliding displacement in terms of a single ground motion parameter (peak ground acceleration) and the earthquake magnitude, as well as a vector model that incorporates two ground motion parameters (peak ground acceleration and peak ground velocity). The addition of a second ground motion parameter results in a significant reduction in the standard deviation of the sliding displacement prediction. Comparisons are made between displacement hazard curves developed from the current scalar and vector models and previously developed scalar models that do not include earthquake magnitude. Additionally, an approximation to the vector hazard assessment is presented and compared with the rigorous vector approach. Finally, the inclusion of the soil property uncertainty is shown to increase the mean hazard at a site.

scholarly journals Seismic hazard map of the western hemisphere

1999 ◽  
Vol 42 (6) ◽  
Author(s):  
K. M. Shedlock ◽  
J. G. Tanner
Keyword(s):  
Seismic Hazard ◽  
Natural Disasters ◽  
Ground Motion ◽  
Emergency Response ◽  
Western Hemisphere ◽  
Motion Parameter ◽  
Hazard Map ◽  
Ground Motion Parameter ◽  
Short Period ◽  
Seismic Hazard Map

Vulnerability to natural disasters increases with urbanization and development of associated support systems (reservoirs, power plants, etc.). Catastrophic earthquakes account for 60% of worldwide casualties associated with natural disasters. Economic damage from earthquakes is increasing, even in technologically advanced countries with some level of seismic zonation, as shown by the 1989 Loma Prieta, CA ($ 6 billion), 1994 Northridge, CA ($ 25 billion), and 1995 Kobe, Japan (> $ 100 billion) earthquakes. The growth of megacities in seismically active regions around the world often includes the construction of seismically unsafe buildings and infrastructures, due to an insufficient knowledge of existing seismic hazard. Minimization of the loss of life, property damage, and social and economic disruption due to earthquakes depends on reliable estimates of seismic hazard. National, state, and local governments, decision makers, engineers, planners, emergency response organizations, builders, universities, and the general public require seismic hazard estimates for land use planning, improved building design and construction (including adoption of building construction codes), emergency response preparedness plans, economic forecasts, housing and employment decisions, and many more types of risk mitigation. The seismic hazard map of the Americas is the concatenation of various national and regional maps, involving a suite of approaches. The combined maps and documentation provide a useful global seismic hazard framework and serve as a resource for any national or regional agency for further detailed studies applicable to their needs. This seismic hazard map depicts Peak Ground Acceleration (PGA) with a 10% chance of exceedance in 50 years for the western hemisphere. PGA, a short-period ground motion parameter that is proportional to force, is the most commonly mapped ground motion parameter because current building codes that include seismic provisions specify the horizontal force a building should be able to withstand during an earthquake. This seismic hazard map of the Americas depicts the likely level of short-period ground motion from earthquakes in a fifty-year window. Short-period ground motions effect short-period structures (e.g., one-to-two story buildings). The largest seismic hazard values in the western hemisphere generally occur in areas that have been, or are likely to be, the sites of the largest plate boundary earthquakes. Although the largest earthquakes ever recorded are the 1960 Chile and 1964 Alaska subduction zone earthquakes, the largest seismic hazard (PGA) value in the Americas is in Southern California (U.S.), along the San Andreas fault.

A Method of Determining Strengthening Design Ground-Motion Parameters for the Existing Building

2010 ◽  
Vol 163-167 ◽  
pp. 3443-3447
Author(s):  
Yu Hong Ma ◽  
Gui Feng Zhao ◽  
Jie Cui ◽  
Ping Tan
Keyword(s):  
Seismic Hazard ◽  
Ground Motion ◽  
Motion Parameter ◽  
Reference Period ◽  
Seismic Strengthening ◽  
Existing Building ◽  
Hazard Curve ◽  
Ground Motion Parameter ◽  
Seismic Hazard Curve ◽  
Characteristic Zone

At present, seismic strengthening design reference period of the existing building is usually equal to 50 years in China, sometime this is uneconomic and unreasonable. In this paper, determining principle of seismic strengthening design reference period for the existing building with different importance is presented. The seismic strengthening design level of the existing building is put forward. After the shape factor of intensity probability distribution function is used to represent the seismic hazard characteristic of different areas, the seismic hazard curve formula of design acceleration Amax and earthquake influence coefficient αmax are deduced according to the seismic hazard curve of intensity. The seismic strengthening design ground motion parameter for the existing building with different importance is researched in detail by use of hazard curve formula of seismic ground motion parameter based on seismic hazard characteristic zone. At last, the method and the calculation step are explained by a calculation example. The result shows that for the existing building with different design reference period, using same design parameter is unreasonable in different seismic hazard characteristic zone, and the method is more scientific than the code method.

scholarly journals Stochastic Simulation of Strong Ground Motions From Two M > 5 Uttarakhand Earthquakes

2021 ◽  
Vol 9 ◽  
Author(s):  
Nitin Sharma ◽  
D. Srinagesh ◽  
G. Suresh ◽  
D. Srinivas
Keyword(s):  
Ground Motion ◽  
Ground Motions ◽  
Plate Boundary ◽  
Response Spectra ◽  
Site Effect ◽  
Vital Role ◽  
Frequency Range ◽  
Waveform Data ◽  
Ground Motion Parameter ◽  
Time Histories

Many studies based on the geodetic data and statistical analysis of seismicity have pointed out that sufficient amount of stress accumulated in the Himalayan plate boundary may host a big earthquake. Consequently, high seismic activities and infrastructural developments in the major cities around Himalayan regions are always of major concern. The ground motion parameter estimation plays a vital role in the near real time evaluation of potentially damaged areas and helps in mitigating the seismic hazard. Therefore, keeping in mind the importance of estimation of ground motion parameters, we targeted two moderate-size earthquakes that occurred recently within a gap of 10 months in Uttarakhand region with M > 5.0 on 06/02/2017 and 06/12/2017. The ground motions are simulated by adopting a stochastic modeling technique. The source is assumed as ω−2, a circular point source (Brune’s model). The average value of reported anelastic attenuation from various studies, the quality factor, Qs = 130.4*(f0.996), and stress drop values obtained through iterative procedure are considered for simulations. The stochastic spectra are generated between 0.1 and 10 Hz of frequency range. The site effect is also estimated by using the H/V method in the same frequency range. The synthetic spectra are compared with the observed Fourier amplitude spectra obtained from the recorded waveform data and converted back to the time histories. The stochastic time histories are compared with the observed waveforms and discussed in terms of amplitude (PGA). The simulated and observed response spectra at different structural periods are also discussed. The mismatch between the observed and simulated PGA values along with the GMPE existing for shallow crustal earthquakes is also discussed in the present work.

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