In accordance with nsr1, seismic psas are required for seismic evaluation of nuclear power plants. Dattadepartment of civil engineering, iit probabilistic seismic hazard analysis psha. Ezfrisk software for earthquake ground motion estimation. Appendix d probabilistic seismic hazard analysis for. It was authored by christie hale, norman abrahamson, and yousef. Demarcation of areal and linear seismic sources involves a certain degree of uncertainty and this should be reflected in the final seismic hazard results. Size of earthquake location rate of occurrence of earthquake predictive relationshipcontdlec51psha is carried out in 4 steps. Why is probabilistic seismic hazard analysis psha still. Ezfrisk technical capabilities seismic hazard analysis. Fugro upgrades ezfrisk seismic hazard analysis software.
The first stage in hazard analysis is to identify the types of hazards. Software developed at reclamation for performing psha is described in this manual. The seismic hazard analysis was carried out using 3dimension 3d seismic source models fault source model using the latest research works regarding the tectonic setting of sumatra and java. For example, probabilistic seismic hazard analysis psha, a widely used method for deriving the relationship between groundmotion values and their annual probabilities of exceedance or return periods, has been used to estimate seismic risk.
An introduction to probabilistic seismic hazard analysis. Geological survey peter powers, research geophysicist, u. An attempt was made to compile the occurrence of past and recent seismic activities within 300 km radius, around the dam site. But on the other hand, the large amounts of data that can be used to justify the model do increase the power of the method. Seismic hazard and seismic risk in the united states earthquake hazard and emergency management 45 during a specific exposure time. The program is the result of more than 30 years of continuous innovations, developments and improvements, providing the most comprehensive, yet easy to use, software suitable for academic and commercial uses. Seismic analysis is a subset of structural analysis and is the calculation of the response of a building or nonbuilding structure to earthquakes. Software to download usgs earthquake hazard program. Current seismic hazard map1997 peak acceleration%g with 10% probability of exceedance in 50 years. A developing communitymodeling environment for seismic hazard analysis, seismological research letters, 74, no. The field of seismic hazard analysis, reing the main compcnent ex pra studies, has profited greatly from this development. Intensity data are and should be still used as a supplement to the instrumental recordings.
Probablistic seismic hazard analysis psha and the detemininstic seismic hazard analysis dsha. What is strisk strisk is a software package used by insurance and mortgage duediligence investigators and structural engineers to perform detailed earthquake risk analysis for individual buildings. A sincere effort is made herein to do seismic hazard analysis for ballar dam of chattisgarh state. The length of rupture of the fault as a function of earthquake magnitude is accounted for, and ground motion estimates at the site are made using the magnitude of the earthquake and the closest distance from the. Seismic hazard and design earthquakes for the central archaeological area of rome. Rcrisis is the newest version of crisis, a worldwide and wellknown solution for performing probabilistic seismic hazard analyses psha. I wanted to check the completeness of an earthquake catalog. Indian institute of technology, kanpur 1 module 7 seismic hazard analysis lectures 33 to 36 lecture 34 topics 7. Geological survey usgs 2014 national seismic hazard maps for the continental u. Such software also allow for critical comparisons to be made between the different technical solutions implemented, in order to understand the degree of similarity between results provided by seismic hazard calculators, within controlled. Open source seismic hazard analysis software framework opensha.
More recently, peak ground acceleration, and to a much lesser extent the peak. Seismic hazard analysis with randomly located sources. Waves is the result of over 15 years of development and refinement of our seismogram viewer, which we believe is by far the easiest to use earthquake waveform analysis software package available today. Note that all applications are being continually developed and that the project provides no guarantees as to their serviceability. I saw the paper probabilistic seismic hazard analysis for rock sites in the chennai city by g. These analyses and reports are used by mortgage brokers to make lending decisions, insurance brokers to rate assessments, and building owners to make seismic retrofit plans. As an objectoriented framework, opensha can accomodate arbitrarily complex e. However, the magnitudes which dominate this seismic hazard are 0. The probabilistic seismic hazard analysis recommended in this safety guide also addresses what is needed for probabilistic safety assessments psas conducted for nuclear installations. Geological survey jorge meneses, principal geotechnical engineer, rma group, inc. Open source seismic hazard analysis software framework. Free earthquake analysis software seismology research centre. Phast process hazard analysis software examines the progress of a potential incident from the initial release to farfield dispersion analysis including modelling of pool spreading and evaporation, and flammable and toxic effects.
Seismic hazard analysis calculating the probability of earthquake ground shaking at the surface or in the bedrock beneath a site based on the location of surrounding faults spectral matching adjusting an accelerogram to match a target. Comparison of probabilistic seismic hazard analysis of nuclear. Regarding the probabilistic seismic hazard analysis, the ground shaking maps indicated that the southeastern part of the mmcm and northwestern part of phayao provinces were high hazard areas, with. Deterministic seismic hazard analysis notes edurev. Download project plan for development of the diablo canyon seismic source model using sshac level 3. Seismic hazard is a natural phenomenon such as ground shaking, fault rupture, or soil liquefaction that is generated by an earthquake, whereas seismic risk is the probability that humans will incur loss or damage to their built environment if they are exposed to a seismic hazard. Opensha is an opensource, javabased platform for conducting. This does mean that this type of seismic hazard analysis is a much more major undertaking than in the methodologies described previously. The probabilistic seismic hazard analysis is performed for 2% probability of exceedance in 50 years and 10% probability of exceedance in 50 years, while the deterministic seismic hazard analysis is carried out by sagaing and kyaukkyan fault.
It reads seismic data acquired during a cptus measurement or downhole test and creates the profile of the shear waves velocity vs or compression waves vp for that measurement. A seismic hazard is the probability that an earthquake will occur in a given geographic area. Even though it has never been validated by objective testing, probabilistic seismic hazard analysis psha has been widely used for almost 50 years by governments and industry in applications with lives and property hanging in the balance, such as deciding safety criteria for nuclear power plants, making official national hazard maps, developing building code requirements, and determining. Provides the technical background needed to fully appreciate what goes into seismic hazard analysis and thus to better understand the strengths and weaknesses of what can emerge from such analysis. The main categories are programs for generating ape data for fault an d areal seismic sources, postprocessing these results in a logic tree format, and programs for other, more general seismic hazard analysis. Although seismic hazard and risk have often been used interchangeably, they are fundamentally different. A seismic hazard is the probability that an earthquake will occur in a given geographic area, within a given window of time, and with ground motion intensity exceeding a given threshold.
The purpose of this document is to discuss the calculations involved in psha, and the motivation for using this approach. Depending on the types of hazards identified, the process may need to be continued on a separate basis for each type of hazard or group of hazard types. By early 2015, the software will incorporate the u. Regionalization according to administrative district 2 seismic zones maximum ground acceleration for each zone. Expel is a software tool for probabilistic seismic hazard analysis, following the methodological line of the expert judgement and the logic tree. Your seismic hazard analysis module license comes with area, fault, and gridded seismic sources needed to analyze ground motion hazard in one region of the world. Introduction to probabilistic seismic hazard analysis. Combines seismic hazard with the consequences of the earthquake. For example, one might want to know the probability that peak ground acceleration the imt will exceed 0. To learn about seismic source characterization by the senior seismic hazard analysis committee, you can explore the committees. The uncertainty associated with the description of the geographical coordinates of a source zone boundary is modeled by introducing the concept of random boundary, where the location of the boundary is assumed to exhibit a spatial. In order to improve the accessibility of seismic hazard analysis results to design engineers and public planners software tools for interogation of seismic hazard results are currently under development keep an eye out on this page. It is part of the process of structural design, earthquake engineering or structural assessment and retrofit see structural engineering in regions where earthquakes are prevalent as seen in the figure, a building has the potential to wave back. Page 1 nptel earthquake geotechnical engineering dept.
This computer program makes probabilistic seismic hazard calculations at sites affected by earthquakes occurring on faults which are defined by the user as a series of line segments. Elsevier engineering geology 40 1995 1 7 engneern giogy opinion paper deterministic versus probabilistic seismic hazard analysis for critical structures ellis l. Probabilistic seismic hazard analysis for the city of quetta, pakistan. Seismic hazard and seismic risk are fundamentally different.
Because many models and data sources are combined to create results like. The goal of seismic hazard analysis sha is to state the probability that something of concern will occur given one or more earthquakes. Spas 2019 is a simple seismic signal processing and seismic analysis software. Seismic hazard analysis seismic hazard analysis involves the quantitative estimation of ground shaking hazards at a particular area. The seismic hazard analyses performed suggest that the pga seismic hazard averaged over the next 50 years is 4050% higher than that prior to the canterbury earthquake sequence. Infraterra personnel are experts in the development of sitespecific ground motions using probabilistic and deterministic seismic hazard analysis. It is the worlds most comprehensive process hazard analysis software system. Psha is a fundamental step to generate information that can contribute to reduce the seismic risk in cities. We provide seismic source characterization through an assessment of fault and area sources, detailed analysis of regional seismicity and tectonic setting, and development. Issues and alternatives zhenming wang 1 abstractseismic hazard and risk are two very important concepts in engineering design and other policy considerations. Fema 451b topic 5a notes seismic hazard analysis 2 instructional material complementing fema 451, design examples seismic hazard analysis 5a 2 seismic hazard analysis deterministic procedures probabilistic procedures usgs hazard maps 2003 nehrp provisions design maps site amplification nehrp provisions response spectrum ubc response spectrum. Manual for reclamation faultbased probabilistic seismic hazard. The main purpose of seismic hazard analysis is to provide parameters for estimating seismic risk.
Usgs software tools for sitespecific ground motion hazard analysis. Ezfrisk is a software package used by engineers and seismologists to perform sitespecific earthquake hazard analysis. Global seismic hazard assessment program infrastructure risk research project at the university of british columbia, vancouver, canada. Probabilistic seismic hazard analysis code verification. Fema 451b topic 5a handouts seismic hazard analysis 6 instructional material complementing fema 451, design examples seismic hazard analysis 5a 31 0. More specifically, sha states the probability that an intensity measure type imt will exceed some intensity measure level iml. Any physical phenomena associated with an earthquake e.
Probabilistic seismic hazard analysis psha psha is the most used method to assess seismic hazard and risk for input into various aspects of public and financial policy. It predicts the probability of occurrence of acertain level of ground shaking at a site byconsidering uncertainties of. The expel code for probabilistic seismic hazard analysis and. Deterministic versus probabilistic seismic hazard analysis. With waves you can view seismic data files recorded in miniseed, pcsuds, and other file formats. Seismic hazard estimates for the area of pylos and surrounding region sw peloponnese for seismic and tsunami risk assessment. Steps in hazard assessment the process of natural hazard. You can license additional regions at additional cost. Iaea safety standards seismic hazards in site evaluation. Our goal is to provide a framework where any arbitrarily complex e. Krinitzsky geotechnical laboratory, waterways experiment station, corps of engineers, vicksburg, ms 391806199, usa received march 6, 1995. But when examined more carefully, the approach is actually rather intuitive.