World bank, the wb the data set comes from both the global seismic hazard program and a database of earthquake events greater than 4. Sample acceleration and velocity seismograms for small earthquakes a the eastwest component of a m l 3. 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. Effective horizontal peak ground accelerations a a for rock soil profile b, see 2. Strong motion simulation for the philippines based on seismic. Gis map can clearly reveal the high peak ground acceleration pga effect on subsoil.
A couple weeks ago on youtube john cadogan made the statement peak acceleration occurs at peak horsepower, referring to typical ic engines. Peak ground acceleration pga and spectral acceleration sa are commonly used in terms of expressing earthquake hazards. Estimation of peak ground acceleration and spectral. Procedures for estimating earthquake ground motions usgs. The purpose of this paper is to present the pgam and spectral acceleration for makassar city based on a probabilistic approach. Seismic hazards during many disastrous earthquakes are observed to be aggravating at the sites with the soft soil deposits due to amplification of ground motion. The estimation of peak groundmotion parameters from spectral. This particular data set is for peak ground acceleration with a 10 percent probability of exceedance in 50 years.
Similarly, for the effective peak acceleration related to velocity a v see. The main features of the strong ground motion were long duration of strong ground shaking. The characteristics of strong ground motion, the site category, depth of the soil column, type of rock strata, and the dynamic soil properties at a particular site significantly influence the free field motion during an earthquake. In this study, liquefaction hazard has been assessed for an area developed. Seiche the sloshing of a closed body of water from earthquake shaking. Free field surface motion at different site types due to. Prediction of peak ground acceleration of irans tectonic regions. However, there are many examples of the use of pgv in engineering seismology and earthquake engineering, including as a parameter from which to estimate. Attenuation relationships for peak horizontal ground acceleration for short. Spectral acceleration, with a value related to the natural frequency of vibration of the building, is used in earthquake engineering and gives a closer approximation to the motion of a building or other structure in an earthquake than the peak ground acceleration value, although there is normally a correlation between short period sa and pga. For each seismic zone the reference peak ground acceleration, a gr, corresponds to the reference probability of exceedance in 50 years, p ncr, of the seismic action for the nocollapse requirement.
Pga is equal to the amplitude of the largest absolute acceleration recorded on an accelerogram at a site during a particular earthquake. The desired final contours were selected and polygon topology was ascertained as well as appropriate feature attributes. Evaluation of groundmotion modeling techniques for a. Seismic design maps usgs earthquake hazard program. Where y is the peak ground horizontal acceleration, x is hypocentral distance and m is. This can be measured at or specified for different oscillation frequencies and with different degrees of. The characteristics of strong ground motion, the site category, depth of the soil column, type of rock strata, and the dynamic soil properties at a particular site significantly influence the free field motion during an. In fact, the true measure is pseudospectral acceleration, which is equal to. Estimation of peak ground acceleration from horizontal. To this reference ground motion an importance factor. Attenuation characteristics of peak ground acceleration. Typically only change this at interchange ramps, to prevent offramp vehicles from turning. Peak acceleration general discussion car talk community.
Ninety five threecomponent records from 15 ground motions that occurred in northwestern turkey between 1999 and 2001 were used. Method of combining components should be taken into consideration to. Peat ground acceleration seismic map 10% in 50 years excecdance explanation peak acceleration, expressed as a fraction of standard gravity g 0. The seismic hazard map of the americas depicting peak ground acceleration pga, given in units of ms 2, with a 10% chance of exceedance in 50 years. Learn more about accelerogram, seismic, seismology, geophysics, pga. Probability probability of exceedence in 50 years pga peak ground acceleration based on intensityacceleration relationships from 1. 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.
In december 2000, a tectonic event occurred in the southern part of the netherlands near the city of voerendaal. Spectral acceleration sa is a unit measured in g the acceleration due to earths gravity, equivalent to gforce that describes the maximum acceleration in an earthquake on an object specifically a damped, harmonic oscillator moving in one physical dimension. I considered that ambiguous and not true in every situation, so i made a slightly less ambiguous statement in the comments. This change from one speed, or velocity, to another is called acceleration. Estimation of peak ground acceleration from horizontal rigid body displacement. Today i managed to get an honorable mention skip to 12. Relationship between peak ground acceleration, peak ground velocity, and intensity in taiwan 389 figure 3. A hybrid computational approach could be optimized by combining more than one soft computing technique. Scaling of peak ground acceleration and peak ground. This is primarily because in deeper quakes, the seismic waves have lost more energy by the time they reach the surface. View peak ground acceleration research papers on academia. Recent studies sponsored by the south carolina department of transportation scdot have shown that f pga, and other spectral site. 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. For at least 290 of the 671 additional observations identified for this study i.
The equations examined in the regression analysis have the following general form. In this article peak ground accelerations pgas observed in 38 earthquakes. Consequently gmpes are more poorly constrained for large earthquakes than for small events. The correlation equations are developed for shallow crustal earthquakes using the next generation attenuation nga ground motion database, and four of. Mar 04, 2011 global earthquake hazard distribution peak ground acceleration is a 2. Geologic mapping has cascades and merge with geophysical lineaments and extended the swif from the. Technically, then, acceleration is how much the velocity changes in a unit time. Effect of high peak ground acceleration on the liquefaction. The view of seismic hazard in the halmahera region aip publishing.
Medvedev 1968 for mmi ix level ground motions, shepherd and aspinall 1980 estimated an acceleration of 32% g with a 30% probability of exceedence in 50 years on hard. Spectral acceleration, sa, is the most commonly used intensity measure in practice today for analysis of buildings. For other types of soil profile these values are scaled by a factor f a. Peak ground acceleration pga the peak ground acceleration during an earthquake measured in units of g gravity. The varying pga results from an earthquake can be displayed on a shake map. Estimation formulas for peak ground acceleration amax and effective ground acceleration ae, used with the jma scale of seismic intensity. Attenuation characteristics of peak ground acceleration from.
Values of peak horizontal ground velocity and displacement derived from accelerograms of past earthquakes and. 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. As defined by usgs, pga peak acceleration is what is experienced by a particle on the ground. For the peak hour factor phf if you have actual hourly counts, use may use that phf to enter into this screen. During an earthquake when the ground is shaking, it also experiences acceleration. The peak ground acceleration pga and sa values at ground surface may vary signi. The map provides contours of pga for a probability of exceedance pe of 10% in 50 years, which corresponds to approximately 15%.
To determine the design mce ground motion, the deterministic peak horizontal ground acceleration from nearby fault sources is compared to that from the background earthquake. May 05, 2017 a couple weeks ago on youtube john cadogan made the statement peak acceleration occurs at peak horsepower, referring to typical ic engines. Hough, tomoyo taniguchi, and jeanrobert altidor abstract the m 7. Every friday he does a video responding to some of the comments. Hybrid artificial neural networksimulated annealing. Shallow quakes tend to be much more damaging than deep quakes of comparable magnitude such as the m6. Eeri empirical groundmotion models for the rotationindependent average horizontal component from shallow crustal earthquakes are derived using the peer nga database. Summary a seismic hazard model for south america, based on a smoothed gridded seismicity model, a subduction model, a crustal fault model, and a ground motion model, has been produced by the u. 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. Pdf the goal of the study is to analyze the distributions of peak ground acceleration, velocity and displacement from 18 moderate size undercrustal. Global earthquake peak ground acceleration hazard distribution.
Pillaib and kirat pal adepartment of earthquake engineering, indian institute of technology, roorkee, india. Three different artificial neural network ann methods, namely, feedforward backpropagation ffbp, radial basis function rbf, and generalized regression neural networks grnns were applied to predict peak ground acceleration pga. Peak ground acceleration with a 10% probability of. The peak acceleration is the largest increase in velocity recorded by a particular station during an. Peak ground acceleration can be expressed in g as either a percentage. Peak ground acceleration pga is equal to the maximum ground acceleration that occurred during earthquake shaking at a location.
Earthquake shaking generally occurs in all three directions. Estimation of peak ground acceleration from horizontal rigid. Procedures for estimating earthquake ground motions. How can i calculate the peak ground acceleration from a. Free field surface motion at different site types due to near. Peak ground velocity pgv the peak ground velocity during an earthquake measured in units of cmsec cgs peak ground displacement pgd the peak ground displacement during an earthquake measured in units of cm cgs. Usgs fema earthquake intensity and classification are commonly measured. Scaling of peak ground acceleration and peak ground velocity boll. Empirical correlation equations between peak ground acceleration, spectral acceleration, spectrum intensity, and acceleration spectrum intensity are developed. Distribution of peak ground acceleration, pga, values derived from the strong motion records used in the present work as a function of, a epicentral distance, r and, b moment magnitude, m.
Jan 23, 2017 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. Pdf peak ground acceleration, velocity and displacement from. Relationship between peak ground acceleration, peak ground. Peak ground acceleration with a 10% probability of exceedance. 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. Liquefaction hazard maps are useful tools for identifying areas with high likelihood of liquefaction induced ground deformation, a major cause of damage in many earthquakes 8. Peak ground acceleration with a 1% probability of exceedance. Procedure to estimate maximum ground acceleration from. Global earthquake hazard distributionpeak ground acceleration is a 2. By june 2003 this network recorded 60 triaxial accelerograms of seismic events. Variation in groundmotion response spectra and peak ground acceleration values for the same value of. Prediction of peak ground acceleration using esvr, nsvr and lssvr algorithm sonia thomas a, g.
Analysis psha aims to quantify these uncertainties, and combine them to produce an. Global earthquake hazard distribution peak ground acceleration. Merging the two methods psha and dsha is one way to complement each other. The higher of these two values represents the mce acceleration used as a design input to the stabilitydeformation. 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. This value represents the maximum acceleration that a ground motion will cause in a linear oscillator with a speci. 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. The peak acceleration is the largest increase in velocity recorded by a particular station during an earthquake. The site classification is rock everywhere except canada and the united states, which assume rockfirm soil reference ground conditions. Earthquake energy is dispersed in waves from the hypocentre, causing ground movement omnidirectionally but typically modelled horizontally in two directions and vertically. Earthquake energy is dispersed in waves from the epicentre, causing ground movement horizontally in two directions and vertically. Jul 26, 2017 an extension of the data collection to response spectral acceleration or peak ground velocity was considered.
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