Therefore, pga is often split into the horizontal and vertical. Values of peak horizontal ground acceleration recorded in past earthquakes and used for estimating horizontal ground motions in earthquakeresistant design. Pdf files of the two requested maps are shown on this slide. When the ground is shaking during an earthquake, it also experiences acceleration. To provide a means of assessing the relative distribution and frequency of global earthquake hazard. Ground accel responding accel c building natural period 0.
The table below shows that there is a 90% chance that ground shaking over the next 50 years would be between the threshold of architectural damage with cracks in walls. The goal of the study is to analyze the distributions of peak ground acceleration, velocity and displacement from 18 moderate size undercrustal earthquakes m w 4. For the simplified liquefaction procedure routinely applied in practice youd et al 2001 the peak horizontal ground acceleration pga is the primary measure of the strength of shaking. Geotechnical data and soil column model for site located in the southern sharon and lod valley area zone 3, yehud area table 7. Nearsurface peak horizontal acceleration for surface and surfacetangent 20t high explosive events at wet, layered sites. An accelerogram can be integrated to obtain the time variations of the ground velocity and ground displacement. The pga can be estimated by attenuation relationships using magnitude, distance, source type etc of a ground motion. Since the intensity of gravity g is about 10 meterssecsec 10 gals is about 1% of gravity. The dominant period ranges, of the recorded ground motions at the wind farm sites, were around 0. Note on scaling of peak ground acceleration and peak ground. Measured mean horizontal peak ground accelerations reach values of up to 2. In terms of structural response, it corresponds to the peak value of the absolute acceleration of a single degree of freedom sdof system with. An introduction to probabilistic seismic hazard analysis psha.
This section also explains the basis for the new peak ground acceleration pga maps in the 2009 provisions and asce 710 and the new equations for vertical ground motions. Maps are then downloaded as pdf files or postscript files. These lnsa values are normally distributed, which means that the nonlogarithmic sa values are lognormally distributed. Seismic design maps usgs earthquake hazard program. The map is based on the most recent usgs models for the conterminous u. The estimation of peak groundmotion parameters from. Peak ground acceleration pga is a very important ground motion parameter which is used to define the degree of ground shaking during an earthquake. Pga, where pga is the peak ground acceleration obtained from the ground motion mapsfrom the ground motion maps.
Earthquake hazard zonation using peak ground acceleration. Procedure to estimate maximum ground acceleration from. Peak ground acceleration with a 1% probability of exceedance. Average and standard deviation of ratio of spectral acceleration at short period s s and 1 second period s 1 versus pga for different range pga accordingly maps of usa table5. It is also very helpful for designing earthquake resistant structure. Empirical development of ground acceleration, velocity. Relationship between peak ground acceleration, peak ground. This particular data set is for peak ground acceleration with a 1 percent probability of exceedance in 1 year. Syahdan no 9 palmerah jakarta 11480 indonesia 2 department of computer science and electronic, gadjah mada university, sekip utara, bulak sumur, yogyakarta 55281, indonesia. Pga records the acceleration rate of change of speed of these movements, while peak ground velocity is the greatest speed rate of movement reached by the ground, and peak displacement is the distance moved.
The main features of the strong ground motion were long duration of strong ground shaking. The map of peak ground velocity pgv is given in ms. Earthquake hazard zonation using peak ground acceleration pga approach e irwansyah1, e winarko2, z e rasjid3, r d bekti4 1,3,4 school of computer science, binus university, jl. The global earthquake hazard distribution peak ground acceleration is a 2. Pga is the effective peak ground acceleration during the earthquake. The data are for the western united states and are based on the longterm 2014 national seismic hazard model. The peak ground acceleration pga is used here as the maximum absolute value of acceleration found for particular strong motion record. That is the maximum horizontal ground acceleration excluding high frequency spikes. Procedures for estimating earthquake ground motions. The map provides contours of pga for a probability of exceedance pe of 10% in 50 years, which corresponds to approximately 15%. An introduction to probabilistic seismic hazard analysis. This data set represents the results of calculations of hazard curves for a grid of points with a spacing of 0.
Peak ground acceleration wikipedia republished wiki 2. Peak acceleration an overview sciencedirect topics. Recorded ground acceleration timeseries data in two directions northsouth and eastwest at kamisu and hiyama wind farms fksh 19 and ibrh20 are presented in fig. The preliminary relationship be tween the mmi and pga is reported to be a function of log. Empirical relationships between the macroseismic intensity and the ground. Peak ground velocity pgv has received much less attention in the technical literature than more widelyused parameters such as peak ground acceleration. In fact, the true measure is pseudospectral acceleration, which is equal to. Spectral acceleration, sa, is the most commonly used intensity measure in practice today for analysis of buildings. For the high seismic qualification level, which has a peak input ground acceleration of 0. The analysis involved determination of peak ground acceleration at bedrock using probabilistic seismic hazard analysis psha, the average. Modified mercalli scale uwi seismic research centre. However, there are many examples of the use of pgv in engineering seismology and earthquake engineering, including as a parameter from which to estimate macroseismic intensity and.
The peak ground acceleration pga and sa values at ground surface may vary signi. Global attenuation relationship for estimating peak ground. Fannie mae peak ground acceleration the 2014 update of the fannie mae multifamily selling and servicing guide for property needs assessments pna has been revised to include a determination of site seismic hazard using the 475year 10% in 50year peak ground acceleration. The pga and spectral acceleration m m play an important role in. Sa spectral acceleration is approximately what is experienced by a building, as modeled by a particle on a massless. Earthquake shaking generally occurs in all three directions. Values are for firm ground nbcc 2015 site class c, average shear wave velocity 450 ms. Ground motion predictions models, such as the one used to make figure 1. This value represents the maximum acceleration that a ground motion will cause in a linear oscillator with a speci. An earthquake hazard map, commonly referred to as a percent peak ground acceleration %pga map, for the state of new york is included as figure 3128. Procedures for estimating earthquake ground motions usgs. This change from one speed, or velocity, to another is called acceleration.
Technically, then, acceleration is how much the velocity changes in a unit time. Relationship between peak ground acceleration, peak ground velocity, and intensity in taiwan figure 3. The table below shows that there is a 90% chance that ground shaking over the next 50 years would be between. The peak ground acceleration, duration, and frequency content of earthquake can be obtained from an accelerograms.
Abstract we present a revised ground motion prediction equation gmpe for computing medians and standard deviations of peak ground acceleration pga and 5% damped pseudospectral acceleration psa response ordinates of the horizontal component of randomly oriented ground motions to be used for seismichazard analyses and engineering. Peak acceleration is a commonly employed parameter for these regressions, but peak velocity, peak displacement, spectral amplitudes, and duration have also been modeled in this manner. Relationship between peak ground acceleration, peak ground velocity, and intensity in taiwan article pdf available in bulletin of the seismological society of america 93. Once the fault locations, seismicity rates, and ground motion attenuation have been. The data are for the central and eastern united states and are based on the oneyear model. Evaluation of liquefaction hazards in washington state. Relationship between peak ground acceleration, peak. Costa rica is located in a seismically active region. Earthquake hazard zonation using peak ground acceleration pga.
View peak ground acceleration research papers on academia. The peak acceleration is the largest increase in velocity recorded by a particular station during an earthquake. Pdf relationship between peak ground acceleration, peak. The national earthquake ground motion map used in the existing aashto provisions is a probabilistic map of peak ground acceleration pga on rock that was developed by the u. Pdf estimation of peak ground acceleration pga for. M is earthquake magnitude and r is hypocentral distance in kilometres. As defined by usgs, pga peak acceleration is what is experienced by a particle on the ground. Peak ground acceleration can be expressed in g the acceleration due to earths gravity, equivalent to gforce as either a decimal or percentage.
Seismichazard maps for the conterminous united states, 2014. Fannie mae peak ground acceleration home client types fannie mae peak ground acceleration the 2014 update of the fannie mae multifamily selling and servicing guide for property needs assessments pna has been revised to include a determination of site seismic hazard using the 475year 10% in 50year peak ground acceleration. Pga is equal to the amplitude of the largest absolute acceleration recorded on an accelerogram at a site during a particular earthquake. Peak ground acceleration pga and spectral acceleration sa are commonly used in terms of expressing earthquake hazards. Determination of standard response spectra and effective peak. The peak ground acceleration pga is the maximum amplitude of the ground acceleration timehistory. Maps of spectral sat, where t is the period in seconds and peak ground acceleration pga values are given in units of g 9. For structural engineering applications, the most widely used among them is the peak ground acceleration pga, as it is traditionally and immediately. Earthquake hazard map showing peak ground accelerations having a 2 percent probability of being exceeded in 50 years, for a firm rock site. Scaling of peak ground acceleration and peak ground. Values of peak horizontal ground velocity and displacement derived from accelerograms of past earthquakes and. The accelerograph records three orthogonal components of ground acceleration at a certain location.
The peak acceleration is the largest increase in velocity recorded by a particular station during an. The map shows the percent peak ground acceleration %pga values for new york state with a 10% chance of being exceeded over 50 years. Pdf peak ground acceleration pga of destructive earthquake in. Summary of the gk15 groundmotion prediction equation for. Sample acceleration and velocity seismograms for small earthquakes a the eastwest component of a ml 3.
Estimation of peak ground acceleration pga for peninsular malaysia using geospatial approach article pdf available in iop conference series earth and environmental science 51. Estimation of peak ground acceleration and spectral. Peat ground acceleration seismic map 10% in 50 years excecdance explanation peak acceleration, expressed as a fraction of standard gravity g 0. Ground acceleration an overview sciencedirect topics. During an earthquake when the ground is shaking, it also experiences acceleration. Earthquake energy is dispersed in waves from the hypocentre, causing ground movement omnidirectionally but typically modelled horizontally in two directions and vertically. Peak ground velocity pgv has received much less attention in the technical literature than more widelyused parameters such as peak ground acceleration pga and response spectral ordinates. Determination of standard response spectra and effective. However, there are many examples of the use of pgv in engineering seismology and earthquake engineering, including as a parameter from which to estimate.
Peak ground acceleration pga is equal to the maximum ground acceleration that occurred during earthquake shaking at a location. Pdf the cimandiri fault located in sukabumi, west java is one of the most active faults in indonesia. Relationship between modified mercalli intensity and peak. The estimation of peak groundmotion parameters from spectral. Developed herein is a new peak ground acceleration pgabased.
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