Download or read book Probabilistic Seismic Hazard Analysis of the Mississippi Embayment Incorporating Nonlinear Site Effects written by Mahesh Singh Dhar and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Mississippi Embayment (ME) area is prone to damaging earthquakes as it lies over the New Madrid Seismic Zone, which is considered the most seismically active zone in the central and eastern United States. Several attempts have been made to account for the influence of deep sediment deposits of the ME on the propagation of seismic waves. This study presents the seismic and liquefaction hazards of the ME by adding the local geologic conditions to the 2014 USGS National Seismic Hazard Model. Both equivalent linear and nonlinear site response codes have been used to determine the amplification distribution at a site. This study uses the most up-to-date information available from different researchers and attempts to reduce the effect of uncertainties. A new 3D geologic model has been generated to assign geologic information and shear wave velocity to the soil profiles distributed over the ME area. The 3D model helps to generate an interpolated soil profile at a site for more accurate site response analysis, replacing the use of generic soil profiles. For liquefaction hazard analysis, updated surface geologic maps and liquefaction potential curves have been used. At short periods corresponding to peak ground acceleration the results show that seismic hazard is reduced on the lowlands in comparison to USGS results, mainly due to deamplification of ground motions from strong nonlinearity in the softer soil deposits. The NOAH (nonlinear Iwan model) site response code shows slightly lower hazard on the lowland soils in comparison to those obtained from SHAKE91 (equivalent linear). At long periods, lowlands deposits amplify hazards more in comparison to corresponding USGS results, mainly due to much less soil nonlinearity at long periods. The liquefaction hazard tends to be high in Holocene and late Pleistocene lowlands sediments and low in Pleistocene loess of the uplands. The young sediments and shallow groundwater table depth in lowlands contribute to higher liquefaction hazard. Considering pore pressure effects in nonlinear site response analysis at a test site on the lowlands shows amplification of ground motion even at short periods. Therefore, pore pressure effects should be considered in seismic hazard analysis of the ME. .
Download or read book Probabilistic Seismic Hazard Mapping of the Mississippi Embayment Including the Effect of Soil Conditions written by Gabriel R. Toro and published by . This book was released on 1992 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Methods in Earthquake Engineering written by Manolis Papadrakakis and published by Springer Science & Business Media. This book was released on 2010-12-06 with total page 585 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an insight in advanced methods and concepts for structural analysis and design against seismic loading. The book consists of 25 chapters dealing with a wide range of timely issues in contemporary Earthquake Engineering. In brief, the topics covered are: collapse assessment, record selection, effect of soil conditions, problems in seismic design, protection of monuments, earth dam structures and liquid containers, numerical methods, lifetime assessment, post-earthquake measures. A common ground of understanding is provided between the communities of Earth Sciences and Computational Mechanics towards mitigating seismic risk. The topic is of great social and scientific interest, due to the large number of scientists and practicing engineers currently working in the field and due to the great social and economic consequences of earthquakes.
Download or read book Mapping of Seismic Hazard Due to Shaking Including the Effect of Soil Conditions in the Mississippi Embayment written by Gabriel R. Toro and published by . This book was released on 1991* with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimation of Non Linear Seismic Site Effects for Deep Deposits of the Mississippi Embayment written by Duhee Park and published by . This book was released on 2003 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Site Effects Study in the Mississippi Embayment and Uncertainties Evaluation in Site Response Analysis written by Arash Yarahmadi and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The local site conditions have paramount influence on the characteristics of seismic ground shaking. There are several methods of investigating seismic site effects which can be classified into two major categories; common site-specific response analysis, and procedures that use solely earthquake time series like the Standard Spectral Ratio (SSR), and Horizontal to Vertical Ratio (HVSR) methods. In the SSR method, the spectral ratios of earthquake records at a certain station can be evaluated with respect to a reference station located on a nearby outcrop rock. In the first part of the dissertation, we use earthquake records to find reference stations and use that reference station to find the site amplifications at the target stations inside the Mississippi Embayment (ME). We found WHAR, W41B, and UALR seismic stations, which have reference stations characteristics, close to the ME using horizontal-to-vertical spectrum ratio (HVSR) method. Amplification factors are obtained for six target stations inside the ME using an inversion method with WHAR seismic station as the reference station. Thirty-five local and regional earthquakes in the New Madrid and Arkansas seismic zones are used to perform the inversion. The results show the fundamental frequencies of these stations are as low as 0.2 HZ to 1 HZ, which corresponds to the soft features of their local conditions. In the second part of this dissertation, we focus on finding uncertainties in the 1-D equivalent linear site response analysis (SRA). In SRA these uncertainties are accounted for by generating random cases of soil parameters. Choosing suitable randomization bounds can decrease the effects of the uncertainties in soil parameters on SRA results like predicted spectral accelerations. These bounds quantified by the coefficient of variation (COV), which can be defined for different soil parameters. Using Vertical seismometer arrays, we can compare predicted and observed surface ground motions. In this study we evaluate COVs for different parameters of the soil that are the main input parameters of equivalent linear SRA. Coefficients of variation which generate minimum root means square errors of the observed and predicted response spectra are obtained for different site classes..
Download or read book Earthquake Engineering and Structural Dynamics in Memory of Ragnar Sigbj rnsson written by Rajesh Rupakhety and published by Springer. This book was released on 2017-12-07 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents methods and results that cover and extend beyond the state-of-the-art in structural dynamics and earthquake engineering. Most of the chapters are based on the keynote lectures at the International Conference in Earthquake Engineering and Structural Dynamics (ICESD), held in Reykjavik, Iceland, on June 12-14, 2017. The conference is being organised in memory of late Professor Ragnar Sigbjörnsson, who was an influential teacher and one of the leading researchers in the fields of structural mechanics, random fields, engineering seismology and earthquake engineering. Professor Sigbjörnsson had a close research collaboration with the Norwegian Institute of Science and Technology (NTNU), where his research was mainly focused in dynamics of marine and offshore structures. His research in Iceland was mainly focused on engineering seismology and earthquake engineering. The keynote-lecture based chapters are contributed by leading experts in these fields of research and showcase not only the historical perspective but also the most recent developments as well as a glimpse into the future. These chapters showcase a synergy of the fields of structural dynamics, engineering seismology, and earthquake engineering. In addition, some chapters in the book are based on works carried out under the leadership and initiative of Professor Sigbjörnsson and showcase his contribution to the understanding of seismic hazard and risk in Iceland. As such, the book is useful for both researchers and practicing engineers who are interested in recent research advances in structural dynamics and earthquake engineering, and in particular to those interested in seismic hazard and risk in Iceland.
Download or read book The Memphis Shelby County Tennessee seismic hazard maps written by and published by DIANE Publishing. This book was released on with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 946 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Incorporating Induced Seismicity in the 2014 United States National Seismic Hazard Model Results of 2014 Workshop and Sensitivity Studies written by U. S. Geological Survey and published by Lulu.com. This book was released on 2015-10-18 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Incorporating Induced Seismicity in the 2014 United States National Seismic Hazard Model: Results of 2014 Workshop and SensThe U.S. Geological Survey (USGS) National Seismic Hazard Model (NSHM) for the conterminous United States was updated in 2014 to account for new methods, input models, and data necessary for assessing the seismic ground shaking hazard from natural (tectonic) earthquakes. The USGS NSHM project uses probabilistic seismic hazard analysis to quantify the rate of exceedance for earthquake ground shaking (ground motion). For the 2014 NSHM assessment, the seismic hazard from potentially induced earthquakes was intentionally not considered because we had not determined how to properly treat these earthquakes for the seismic hazard analysis. The phrases "potentially induced" and "induced" are used interchangeably in this report, however it is acknowledged that this classification is based on circumstantial evidence and scientific judgment.
Download or read book Probabilistic Seismic Hazard Assessment Including Site Effects for Evansville Indiana and the Surrounding Region written by Jennifer S. Haase and published by . This book was released on 2011 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stochastic Numerical Methods Applied to Probabilistic Seismic Hazard Analysis and to the Non linear Finite Elements Method written by Maxime Lacour and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The presented research is related to the propagation of epistemic uncertainty in the fields of seismic hazard and numerical simulations. An important part of a probabilistic seismic hazard analysis (PSHA) is the incorporation of the epistemic uncertainty in the hazard calculation. A computationally efficient methodology for propagating the epistemic uncertainty in the ground motion models in PSHA is developed using the polynomial chaos (PC) approach. This approach estimates the full epistemic uncertainty distribution including the tails of the distribution which are not captured using traditional approaches. Similarly, in finite element simulations (FEM), assessing and propagating the epistemic uncertainty in material properties and external loading in the FEM system is necessary to estimate the uncertainty in the resulting ground motion. The stochastic finite elements method also uses the PC approach for that purpose, which is computationally much more efficient than traditional Monte-Carlo simulations. A stochastic constitutive model is also developed to propagate the uncertainty in non-linear material models.
Download or read book On the Incorporation of Site Response in Probabilistic Seismic Hazard Analyses written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recommendations for Probabilistic Seismic Hazard Analysis Appendices written by Senior Seismic Hazard Analysis Committee (SSHAC) and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recommendations For Probabilistic Seismic Hazard Analysis NUREG written by U.S. Nuclear Regulatory Commission and published by . This book was released on 1997* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book State of the art for Assessing Earthquake Hazards in the United States written by Mishac K. Yegian and published by . This book was released on 1979 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a comprehensive review of the state of the art of probabilistic seismic hazard analysis. This type of analysis essentially provides information regarding the likelihood that various levels of a ground motion parameter will be exceeded in a given period of time. The report begins with a discussion of the various seismic parameters required for the analysis and the calculation of these parameters based on seismic history data. Problems involved in the estimation of these parameters exclusively on the basis of seismological data are outlined, and emphasis is placed on the need to utilize and incorporate geologic and geophysical information in the analysis. A brief presentation of Baye's theorem and discussion of the procedure for seismic hazard estimation using the theorem are provided. The report continues with a presentation of the various mathematical formulations used in the calculation of seismic hazard probabilities. This section also includes a discussion of the use of computer programs to facilitate the calculations involved in the analysis. Concluding the report is a presentation and discussion of the various practical applications of seismic hazard analysis, emphasizing use in structural and geotechnical engineering. Some recent seismic hazard maps for the U.S. incorporating probability calculations are presented and reviewed in this section. (Author).
Download or read book The Hazard in Using Probabilistic Seismic Hazard Analysis for Engineering written by E. L. Krinitzsky and published by . This book was released on 1998 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
