To this reference ground motion an importance factor. This value represents the maximum acceleration that a ground motion will cause in a linear oscillator with a speci. This paper deals with the site factor for peak ground acceleration f pga which is defined as. Spectral acceleration, sa, is the most commonly used intensity measure in practice today for analysis of buildings. The ground type can significantly influence ground acceleration, so pga values can display extreme variability over distances of a few kilometers, particularly with moderate to large earthquakes. When the ground is shaking during an earthquake, it also experiences acceleration. How is ground acceleration calculated during earthquakes. Box mg2, ro077125 bucharestmagurele, romania, email. Below are the peak ground acceleration maps for the sep 4th earthquake and below it the february 22nd earthquake that i found on the geonet website click on the image. The occurrence of liquefaction at low acceleration level. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple faq for additional information. Peak ground acceleration with a 1% probability of exceedance.
Global earthquake hazard distribution peak ground acceleration. Thus, the mce spectral response accelerations at 0. Probability of peak ground horizontal and peak ground. 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. A total of ten boreholes were selected in the mohammadpur, dhaka, bangladesh for the study. Peak ground acceleration map used for bridge design. Peak ground acceleration pga is the amount of acceleration of movement of the earth at the point recorded, reported as a percentage of gravitys acceleration 9.
Relationship between peak ground acceleration, peak ground. Learn more about accelerogram, seismic, seismology, geophysics, pga. Estimation of peak ground accelerations for mexican subduction zone earthquakes using neural networks. Although liquefaction of soil is a function of soil condition but the effect of peak ground acceleration pga is obvious. Seismic ground acceleration force per unit of mass plays an important role in. View peak ground acceleration research papers on academia. Relationship between peak ground acceleration, peak ground velocity, and intensity in taiwan 389 figure 3. Estimation of peak ground acceleration pga for peninsular malaysia using geospatial approach article pdf available in iop conference series earth and. Horizontal peak ground acceleration listed as hpga. Earthquake vibrations are commonly recorded by accelerographs which are well calibrated for standard ground acceleration. A record refers to the recorded ground acceleration histories at a particular recording.
Scaling of peak ground acceleration and peak ground velocity boll. Since i the project is located in an area with a low seismicity upstate ny, and since i believe the data available to calculate the peak ground accelation pgausing predictive relationships are not reliable, i am trying to use the pga. The nehrp site classes are used in simplified design procedures to select factors for adjusting available estimates of peak ground surface acceleration and other spectral values available for soft rock sites with v s30 760 ms. Pdf estimation of peak ground acceleration pga for.
The active faults near tehran are capable of producing mw magnitudes of 6. 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 how is peak ground acceleration. Strong motion is currently recording in a mixture of triggered and continuous modes. Estimation of peak ground acceleration and spectral. Earthquake energy is dispersed in waves from the epicentre, causing ground movement horizontally in two directions and vertically. Probabilistic seismic hazard assessment of new zealand. Peak ground acceleration can be expressed in g as either a percentage. 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 peak acceleration is the largest increase in velocity recorded by a particular station during an earthquake. This is the talk page for discussing improvements to the peak ground acceleration article. Use the usgs peak ground acceleration map figure 4. Since i the project is located in an area with a low seismicity upstate ny, and since i believe the data available to calculate the peak ground accelation pgausing predictive relationships are not reliable, i am trying to use the pga values obtained at the usgs. I am doing a preliminary liquefaction potential analysis.
Liquefaction potential at three different levels 3, 6 and 10 m and for three different pga of 0. Effects of surface geology on seismic motion august 2326, 2011 university of california santa barbara site factors for estimating peak ground acceleration in charleston, south carolina, based on v s30 shimelies aboye, ronald andrus, nicholas harman nadarajah ravichandran, and ariful bhuiyan south carolina. Pga % seismic hazard map usgs 2008 seismic hazard map note. Syahdan no 9 palmerah jakarta 11480 indonesia 2 department of computer science and electronic, gadjah mada university, sekip utara, bulak sumur, yogyakarta 55281, indonesia. Worldwide strongmotion data resources are centralised at the cosmos virtual data center. We present the results of a new probabilistic seismic hazard analysis psha for new zealand. Site peak ground acceleration g t i l l a m o o k c o. Free field surface motion at different site types due to near. The pga and spectral acceleration m m play an important role in. Peak ground acceleration with a 10% probability of. The peak ground acceleration pga and sa values at ground surface may vary signi. Seismic design maps usgs earthquake hazard program. 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. Hough, tomoyo taniguchi, and jeanrobert altidor abstract the m 7.
The recorded ground accelerations and response spectra of past. The psha incorporates geological data describing the location and earthquake recurrence behaviour of 305 active faults, a seismicity catalogue with greatly improved locations for many events, new attenuation relationships for peak ground acceleration and spectral acceleration. 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. Estimation of peak ground acceleration from horizontal. Seismic hazard and risk management is a multicriteria based on a given domain into small units of likely uniform ground response in terms of hazard level like peak ground acceleration pga peak ground velocity pgv and peak ground displacement pgd, nature like fissuring, liquefaction, slope deformation and induced flood, fire and damage pattern or risk. If the property is located in a region with a high seismic risk i. Peak ground acceleration with a 10% probability of exceedance. Scaling of peak ground acceleration and peak ground velocity. The calculated bedrock horizontal peak ground acceleration pga and response spectra for 50%, 10% and 2% chance of being exceeded in the next 50 years equivalent to 72, 475 and 2,475 years return period of the study area will be presented. In fact, the true measure is pseudospectral acceleration, which is equal to. This is not a forum for general discussion of the articles subject put new text under old text. Peak ground velocity pgv has received much less attention in the technical literature than more widelyused parameters such as peak ground acceleration. Us peak ground acceleration seismic map pga is an important measure for earthquake engineering and in due diligence, for example in fannie maes 2014 update in their property needs assessment requirements. The desired final contours were selected and polygon topology was ascertained as well as appropriate feature attributes.
During an earthquake when the ground is shaking, it also experiences acceleration. Horizontal peak ground acceleration how is horizontal peak ground acceleration abbreviated. Gegraphical condition of bengkulu bengkulu province is located on the west coast of sumatra at 216 331 latitude and 1011 103. Peak ground acceleration jlnj structural 15 nov 16. I have just modified 5 external links on peak ground acceleration. 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 particular data set is for peak ground acceleration with a 10 percent probability of exceedance in 50 years. Further, depending upon the value of the design ground acceleration and the ground type, it is possible in the national annex to define cases of low or very low seismicity, where. This design earthquake translates to peak ground acceleration pga of 0. Procedure to estimate maximum ground acceleration from. Values of peak horizontal ground velocity and displacement derived from accelerograms of past earthquakes and. Peak ground acceleration for liquefaction potential. Site peak ground acceleration simulated cascadia subduction zone magnitude 9.
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. Global earthquake hazard distributionpeak ground acceleration is a 2. By june 2003 this network recorded 60 triaxial accelerograms of seismic events. The project foundation report will contain the acceleration coefficient for preliminary design to. Usgs fema earthquake intensity and classification are commonly measured. Estimation of peak ground acceleration from horizontal rigid body displacement. This change from one speed, or velocity, to another is called acceleration. Comparison among the three peak ground acceleration models. Click here to start a new topic please sign and date your posts by typing four tildes new to wikipedia. Procedures for estimating earthquake ground motions. However, there are many examples of the use of pgv in engineering seismology and earthquake engineering, including as a parameter from which to estimate.
Seiche the sloshing of a closed body of water from earthquake shaking. In december 2000, a tectonic event occurred in the southern part of the netherlands near the city of voerendaal. Free field surface motion at different site types due to. 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. The varying pga results from an earthquake can be displayed on a shake map. The main features of the strong ground motion were long duration of strong ground shaking. Probabilistic seismic hazard assessment of new zealand eqc. Mar 04, 2011 global earthquake hazard distribution peak ground acceleration is a 2. 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. By reading the peak amplitude of waveform on the accelerograph, we can use the calibration chart to know the peak ground acce. Maps are then downloaded as pdf files or postscript files.
Procedures for estimating earthquake ground motions usgs. The peak acceleration is the largest increase in velocity recorded by a particular station during an. Pga peak ground acceleration seismology acronymfinder. Earthquake hazard zonation using peak ground acceleration. Technically, then, acceleration is how much the velocity changes in a unit time.
Scaling of peak ground acceleration and peak ground. Alternative measures of ground motion in the form of contour maps of peak ground acceleration, peak ground velocity, and spectral response are also given on the website for all 41 rupture sources. It is important to note that these are median estimates. Sample acceleration and velocity seismograms for small earthquakes a the eastwest component of a m l 3. Estimation of peak ground accelerations for mexican. Horizontal peak ground acceleration how is horizontal. 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.
This gives access to a database of strong ground motion data parameters, and links to the data centres and web sites of the contributing agencies. Jan 23, 2017 the ground type can significantly influence ground acceleration, so pga values can display extreme variability over distances of a few kilometers, particularly with moderate to large earthquakes. Sciblogs lyttelton earthquake peak ground acceleration. How can i calculate the peak ground acceleration from a. Estimation of peak ground acceleration from horizontal rigid. Peak ground acceleration can be expressed in g the acceleration due to earths gravity, equivalent to gforce as either a decimal or percentage. Empirical relationships between the macroseismic intensity and the ground. Mean values and standarddeviation error bars of peak ground acceleration, peak ground velocity, and peak ground displacement as a function of modified.
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