Instructional material complementing fema 451, design examples seismic hazard analysis 5a 4 approaches to seismic hazard analysis deterministic the earthquake hazard for the site is a peak ground acceleration of 0. Sep 14, 2009 seismic hazard and seismic risk are fundamentally different. Seismic exclusions and reentry from a risk perspective. Aei provides seismic risk analysis of buildings in a seismic risk assessment sra report prepared in accordance with astm standards e202616a and e255716a. He begins by defining key terms and presents an overview of probabilistic seismic hazard and risk computations to show how all the elements fit together. These analyses and reports are used by mortgage brokers to make lending decisions, insurance brokers to rate assessments, and building owners to make seismic. Although the two terms have often been used interchangeably, they are fundamentally different concepts reiter, 1990. Handbook of seismic risk analysis and management of civil infrastructure systems is an invaluable guide for professionals requiring understanding of the impact of earthquakes on buildings and lifelines, and the seismic risk assessment and management of buildings, bridges and transportation. Here you can download the software installer and make comments on your use. In assessing seismic hazard, we aim to relate earthquake occurrence to the. 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. The goal of seismic hazard analysis sha is to state the probability that something of concern will occur given one or more earthquakes.
It generates tabular results useful for creating seismic hazard maps. Structural engineers can override the engineering parameters for building specific results. An introduction to probabilistic seismic hazard analysis psha. The first step in evaluating the seismic risk of the delta and suisun levees is to assess the seismic hazard of the site. Basic concept seismic hazard and risk are two of the most commonly used terms in engineering design and policy considerations. Deterministicscenario seismic hazard analysis is an appropriate approach for seismic hazard assessment, seismic risk assessment, and engineering design and other policy considerations. Seismicat offers atc, coda, and hazus damage models. Stated most simply, the seismic hazard source model is a description of the magnitude, location, and timing of all earthquakes usually limited to those that pose a significant threat. Risk analysis about earthquake involves many different aspects such as seismic intensity, site condition, distribution and antiseismic capability of buildings, supporting of disaster precautions. Seismic risk analysis is not an end in itself rather, the risk must then be.
Addressing some misconceptions regarding seismic hazard. Seismic risks assessments are used by property owners, tenants, investors, lenders and others to understand and manage earthquakerelated risks. Get your kindle here, or download a free kindle reading app. We can also acquire and analyze highresolution seismic reflection and refraction tomography data as well as vsp vertical seismic profile. Appendix d probabilistic seismic hazard analysis for. Cover photo nonlinear analysis model for a seismic retrofit study of an existing building with concrete shear walls. Nonlinear structural analysis for seismic design, nehrp. More specifically, sha states the probability that an intensity measure type imt will exceed some intensity measure level iml. Seismic hazard is the hazard associated with potential earthquakes in a particular area, and a seismic hazard map shows the relative hazards in different areas.
A webgis tool for seismic hazard scenarios and risk analysis. Alternatively, the instructor may wish to post the file electronically on the internet for the students to download. Seismic hazard and seismic risk analysis in turkey attenuation of the selected groundmotion parameter. The values returned by the two applications are not identical. The main purpose of seismic hazard analysis is to provide parameters for estimating seismic risk. Mcguire fully describes the connection between probabilistic seismic hazard analysis psha and seismic risk in a quantitative format. This disseration describes in detail the current gis technology and the various steps in a regional seismic hazard and risk analysis. Strisk is a software package used by insurance and mortgage duediligence investigators and structural engineers to perform detailed earthquake risk analysis for individual buildings. Handbook of seismic risk analysis and management of civil. Stated most simply, the seismichazard source model is a description of the magnitude, location, and timing of all earthquakes usually limited to those that pose a significant threat. Seismic risk depends not only on the hazard and exposure, but also on models i. Probabilistic seismic hazard assessment psha uses a combination of interpreted geological and seismological data to calculate the probability that a certain level of ground motion will be exceeded, or not exceeded, in a. Ezfrisk technical capabilities seismic hazard analysis.
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. Seismic risk gap analysis, a quantitative approach for seismic risk over a building portfolio risk prioritization analysis need to perform seismic loss assessments need to understand the vulnerability of structures and the potential economic impact of earthquakes need a quantitative loss assessment to manage mitigation strategies. However, the magnitudes which dominate this seismic hazard are 0. It performs a hazard analysis on a rectangular grid contained by a polygon, or a selected set of points. Ezfrisk software for earthquake ground motion estimation.
Seismic hazard assessment methods of hazard calculations iii. In order to assess risk to a structure from earthquake shaking. A dsha involves the development of a particular seismic scenario upon which a ground motion hazard evaluation is based. Ezfrisk is a software package used by engineers and seismologists to perform sitespecific earthquake hazard analysis. The sra report summarizes the risk of structural failure of a building due to the vibratory motion caused by the maximum probable design basis seismic event dbe that has a 10percent chance. Seismic hazard and risk analysis pdf free download. In order to assess risk to a structure from earthquake shaking, we must first determine the annual.
Renren sina weibo sitejot skype slashdot sms stocktwits svejo symbaloo. Ageographic information system gis provides the ideal environment for conducting a comprehensive regional seismic hazard and risk analysis. But to be understood in risk terms, seismic hazard research must forecast the effects of events on. According to the adopted methodology, the general form of the attenuation law of pga is assumed to be of type. Renren sina weibo sitejot skype slashdot sms stocktwits svejo symbaloo bookmarks. Probabilistic seismic hazard analysis psha aims to quantify these uncertainties, and combine them to produce an explicit description of the distribution of future shaking that may occur at a site. Strisk detailed earthquake risk analysis for individual. The process of analyzing the risk involves a fourth crucial aspect the mathematical and theoretical.
Sample seismic risk assessment full detailed report 162 folsom street san francisco, ca prepared for. Introduction to probabilistic seismic hazard analysis. If you wish to be informed of the upcoming registration. Past faults and earthquakesthe behavior of seismic waves as they travel through different parts of the u. User can find the hazard for the site, model the building, run the risk assessment, inspect the results, then rerun or generate and download a report. Problems with current practice and future developments norman abrahamson1 summary this paper addresses issues with current practice in seismic hazard analysis and gives some recommendations for improvements. Seismic risk and loss analysis software selena the basic approach behind this software is physicalanalytical and hybrid, and large resources had been used to define both capacity and fragility vulnerability curves for different building types and levels of design categories. Seismic risk principles for seismic risk mitigation.
Probabilistic seismic hazard analysis psha is a commonly used. Global assessment report on disaster risk reduction. Seismic hazard and risk analysis engineering monographs on. Understanding the terms used in a seismic risk analysis can be a daunting task for those who do not consider seismic risk analysis their area of expertise. Please do not use this tool to obtain ground motion parameter values for the design code reference documents covered by the u. Mcguire, seismic hazard and risk analysis, earthquake engineering research institute, oakland, ca, 2004, isbn 0943198011 this book is the 10th in a series of monographs published by the earthquake engineering research institute eeri that address seismicity and earthquake ground motions, dynamic response of facilities. Stein s, mazzotti s eds continental intraplate earthquakes.
The potential of the gis technology is exploited to a greater extent in risk analysis than in hazard assessment, as the results for the damage depend on the combination of the hazard level with the presence of elements exposed to. The following two paragraphs are a paraphrase from kramer 1996. This section presents the framew section 1 one seismic risk analysis ork for the seismic risk analysis and discusses the results from this analysis. Earthquake capra probabilistic risk assessment platform. Crisis 2007 capra probabilistic risk assessment platform. Seismic hazard and risk basic concepts assessments probabilistic seismic hazard analysis psha alternative seismic hazard assessments seismic hazard analysis sha deterministic seismic hazard anal ysis dsha or neodsha observations from wenchuan, china, earthquake m7. High seismic hazard does not necessarily mean high seismic risk, and vice versa. Intensity data are and should be still used as a supplement to the instrumental recordings. Seismic hazard and seismic risk nuclear energy agency. Deterministic seismic hazard analysis notes edurev.
The direct objectives are to develop earthquake damage scenarios and practical tools for seismic risk management, to conduct a study to understand urban. Buy seismic hazard and risk analysis engineering monographs on earthquake criteria. For example, a source model might be composed of n total earthquake scenarios en, where. This tool was created for easy and engaging group delivery. When ordering a probable maximum loss or seismic risk assessment, user should select a level of assessment that satisfies their unique objectives and.
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. Fema 451b topic 5a notes seismic hazard analysis 11 instructional material complementing fema 451, design examples seismic hazard analysis 5a 11 attenuation with distance note the difference between site amplification and attenuation. Even for those wellversed in this area, there is often confusion over the definition of terms and the introduction of new terms in the evolving field of seismic risk analysis. Section seismic risk analysis california department of. A seismic hazard analysis of the buildings, conducted by a registered engineer experienced in lateral force design an examination of the structure for continuity, ductility, and resistance to lateral forces and identification of geographic and onsite hazards.
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. The determination of seismic risk is the foundation for risk mitigation decisionmaking, a key step in risk management. Understanding the language of seismic risk analysis expert. Unified hazard tool usgs earthquake hazards program. Seismic hazard and seismic risk are fundamentally different. The astm e2557 practice for probable maximum lossseismic risk assessments incorporates elements of e2026 to describe a more specific process for the evaluation of the earthquake damageability. Theoretical principles of management and engineering disciplines trading off with risk hazard and risk ii. Site stability, building stability, and building damageability must be considered during the risk assessment, though evaluations of the damageability of building contents and business interruption can also be completed. Wang z 2007 seismic hazard and risk assessment in the intraplate environment. Aug 01, 2004 mcguire fully describes the connection between probabilistic seismic hazard analysis psha and seismic risk in a quantitative format. Seismic hazard calculations in regions of low seismicity, such as the uk, are generally based on probabilistic methodology. Seismic hazard and risk analysis, earthquake engineering research institute, oakland, ca. The maps are made by considering what we currently know about.
Probabilistic seismic hazard assessment psha sample seismic source zone model for northern balkans a hazard map derived from the north balkan model shown above the probabilistic method for seismic hazard assessment is the one most in favour today. Seismic probable maximum loss partner engineering and. The input from seismic hazard analysis is then used for evaluating the. Seismic hazard and seismic risk analysis in turkey deduced.
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