Therefore, pga is often split into the horizontal and vertical. 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. The table below shows that there is a 90% chance that ground shaking over the next 50 years would be between. The data are for the western united states and are based on the longterm 2014 national seismic hazard model.
Estimation of peak ground acceleration and spectral. Developed herein is a new peak ground acceleration pgabased. To provide a means of assessing the relative distribution and frequency of global earthquake hazard. These lnsa values are normally distributed, which means that the nonlogarithmic sa values are lognormally distributed. Calculation of earthquake actions on building structures. The pga can be estimated by attenuation relationships using magnitude, distance, source type etc of a ground motion.
During an earthquake when the ground is shaking, it also experiences acceleration. Values of peak horizontal ground velocity and displacement derived from accelerograms of past earthquakes and. Nearsurface peak horizontal acceleration for surface and surfacetangent 20t high explosive events at wet, layered sites. Empirical development of ground acceleration, velocity. 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. Values are for firm ground nbcc 2015 site class c, average shear wave velocity 450 ms. Pdf files of the two requested maps are shown on this slide. As defined by usgs, pga peak acceleration is what is experienced by a particle on the ground. Empirical relationships between the macroseismic intensity and the ground. 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. The analysis involved determination of peak ground acceleration at bedrock using probabilistic seismic hazard analysis psha, the average. Once the fault locations, seismicity rates, and ground motion attenuation have been. This change from one speed, or velocity, to another is called acceleration. Costa rica is located in a seismically active region.
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. Determination of standard response spectra and effective peak. Relationship between peak ground acceleration, peak ground velocity, and intensity in taiwan article pdf available in bulletin of the seismological society of america 93. Since the intensity of gravity g is about 10 meterssecsec 10 gals is about 1% of gravity.
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. The peak acceleration is the largest increase in velocity recorded by a particular station during an earthquake. The map is based on the most recent usgs models for the conterminous u. Peak ground acceleration with a 1% probability of exceedance.
Determination of standard response spectra and effective. Earthquake energy is dispersed in waves from the hypocentre, causing ground movement omnidirectionally but typically modelled horizontally in two directions and vertically. Ground motion predictions models, such as the one used to make figure 1. Relationship between peak ground acceleration, peak. In terms of structural response, it corresponds to the peak value of the absolute acceleration of a single degree of freedom sdof system with. Ground acceleration an overview sciencedirect topics. Relationship between modified mercalli intensity and peak.
Earthquake hazard zonation using peak ground acceleration. For structural engineering applications, the most widely used among them is the peak ground acceleration pga, as it is traditionally and immediately. An introduction to probabilistic seismic hazard analysis. 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. Note on scaling of peak ground acceleration and peak ground. Summary of the gk15 groundmotion prediction equation for. An accelerogram can be integrated to obtain the time variations of the ground velocity and ground displacement. Measured mean horizontal peak ground accelerations reach values of up to 2. Procedures for estimating earthquake ground motions usgs. The peak ground acceleration, duration, and frequency content of earthquake can be obtained from an accelerograms. 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. The preliminary relationship be tween the mmi and pga is reported to be a function of log.
In order to assess the earthquake hazard especially for banda aceh city, this research is aimed to develop an earthquake hazard zonation for the building infrastructure using the pga value approach. Sample acceleration and velocity seismograms for small earthquakes a the eastwest component of a ml 3. The dominant period ranges, of the recorded ground motions at the wind farm sites, were around 0. 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 map provides contours of pga for a probability of exceedance pe of 10% in 50 years, which corresponds to approximately 15%.
The main features of the strong ground motion were long duration of strong ground shaking. Earthquake hazard zonation using peak ground acceleration pga. It is also very helpful for designing earthquake resistant structure. Pga, where pga is the peak ground acceleration obtained from the ground motion mapsfrom the ground motion maps. Estimation of peak ground acceleration pga for peninsular malaysia using geospatial approach article pdf available in iop conference series earth and environmental science 51. Peak ground acceleration pga is a very important ground motion parameter which is used to define the degree of ground shaking during an earthquake. The estimation of peak groundmotion parameters from. Evaluation of liquefaction hazards in washington state.
Peak ground acceleration wikipedia republished wiki 2. 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. Modified mercalli scale uwi seismic research centre. Earthquake shaking generally occurs in all three directions. This data set represents the results of calculations of hazard curves for a grid of points with a spacing of 0. Peak ground acceleration pga and spectral acceleration sa are commonly used in terms of expressing earthquake hazards. 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. Spectral acceleration, sa, is the most commonly used intensity measure in practice today for analysis of buildings. Sa spectral acceleration is approximately what is experienced by a building, as modeled by a particle on a massless. The pga and spectral acceleration m m play an important role in. 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 global earthquake hazard distribution peak ground acceleration is a 2. The accelerograph records three orthogonal components of ground acceleration at a certain location.
The map shows the percent peak ground acceleration %pga values for new york state with a 10% chance of being exceeded over 50 years. Relationship between peak ground acceleration, peak ground velocity, and intensity in taiwan figure 3. 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. 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 peak acceleration is the largest increase in velocity recorded by a particular station during an. The peak ground acceleration pga is used here as the maximum absolute value of acceleration found for particular strong motion record. Peak ground velocity pgv has received much less attention in the technical literature than more widelyused parameters such as peak ground acceleration. Values of peak horizontal ground acceleration recorded in past earthquakes and used for estimating horizontal ground motions in earthquakeresistant design. Pga is equal to the amplitude of the largest absolute acceleration recorded on an accelerogram at a site during a particular earthquake. An introduction to probabilistic seismic hazard analysis psha. The estimation of peak groundmotion parameters from spectral.
The peak ground acceleration pga and sa values at ground surface may vary signi. Pdf estimation of peak ground acceleration pga for. Maps are then downloaded as pdf files or postscript files. That is the maximum horizontal ground acceleration excluding high frequency spikes.
Technically, then, acceleration is how much the velocity changes in a unit time. Peat ground acceleration seismic map 10% in 50 years excecdance explanation peak acceleration, expressed as a fraction of standard gravity g 0. Syahdan no 9 palmerah jakarta 11480 indonesia 2 department of computer science and electronic, gadjah mada university, sekip utara, bulak sumur, yogyakarta 55281, indonesia. Maps of spectral sat, where t is the period in seconds and peak ground acceleration pga values are given in units of g 9. Pdf the cimandiri fault located in sukabumi, west java is one of the most active faults in indonesia.
Peak ground acceleration pga is equal to the maximum ground acceleration that occurred during earthquake shaking at a location. Pdf peak ground acceleration pga of destructive earthquake in. M is earthquake magnitude and r is hypocentral distance in kilometres. Ground accel responding accel c building natural period 0. Seismichazard maps for the conterminous united states, 2014. 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. This particular data set is for peak ground acceleration with a 1 percent probability of exceedance in 1 year. Pga is the effective peak ground acceleration during the earthquake. For the high seismic qualification level, which has a peak input ground acceleration of 0.
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. Earthquake hazard map showing peak ground accelerations having a 2 percent probability of being exceeded in 50 years, for a firm rock site. The peak ground acceleration pga is the maximum amplitude of the ground acceleration timehistory. In fact, the true measure is pseudospectral acceleration, which is equal to. Scaling of peak ground acceleration and peak ground. Geotechnical data and soil column model for site located in the southern sharon and lod valley area zone 3, yehud area table 7. Pdf relationship between peak ground acceleration, peak. Procedures for estimating earthquake ground motions. The data are for the central and eastern united states and are based on the oneyear model.
However, there are many examples of the use of pgv in engineering seismology and earthquake engineering, including as a parameter from which to estimate. Global attenuation relationship for estimating peak ground. The map of peak ground velocity pgv is given in ms. Relationship between peak ground acceleration, peak ground. Relationship between peak ground acceleration, peak ground velocity, and intensity in taiwan. When the ground is shaking during an earthquake, it also experiences acceleration. Procedure to estimate maximum ground acceleration from. Peak acceleration an overview sciencedirect topics. This value represents the maximum acceleration that a ground motion will cause in a linear oscillator with a speci. Seismic design maps usgs earthquake hazard program. In the past, several researchers have developed over 450. Peak ground acceleration can be expressed in g the acceleration due to earths gravity, equivalent to gforce as either a decimal or percentage. If the property is located in a region with a high seismic risk i.
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