Download or read book Scaling and Estimation of Earthquake Ground Motion as a Function of the Earthquake Source Parameters and Distance written by D. L. Bernreuter and published by . This book was released on 1981 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scaling and estimation of earthquake ground motion as a function of the earthquake source parameters written by D. L. Bernreuter and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Precise Earthquake Source Parameter Estimation written by Annemarie Susan Baltay and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The question of whether earthquakes, as they increase in size, radiate seismic waves more efficiently is at the core of our understanding of the physics of faulting, as well as our ability to mitigate the effects of strong ground motion. If earthquakes have some intrinsic time or length scale that could be observed or modeled, then seismologists could determine the ultimate size of an earthquake just as it begins to rupture. On the other hand, if earthquakes are self-similar, with no intrinsic time or length scale, than any information learned about the plethora of small and intermediate earthquakes can simply be scaled up to predict parameters, such as ground motion, for larger, more devastating earthquakes. Many studies find that apparent stress and stress drop increase with seismic moment, yet others find an independence of these parameters with moment, obeying self-similar earthquake source physics. Source measurements are controversial due to the inherent difficulty in correcting the radiated waves to negate path and site effects, such as attenuation, scattering or amplification. Independent studies of the same earthquake may find seismic energies that differ by an order of magnitude. Methods to estimate source parameters need to account for these effects, or quantify the range of validity for estimates made with uncorrected seismic records. In this work, I precisely estimate the source parameters radiated seismic energy, apparent stress and stress drop, using both relative spectral measures from empirical Green's functions, and close distance acceleration records. Using relative empirical Green's functions, I can handily negate source and path effects, without explicit consideration of anelastic attenuation. Working with data from 8 sequences of earthquakes in the western US and Honshu, Japan, ranging from M 1.8 to Mw 7.1, I find no clear trend of a dependence of apparent stress or stress drop with moment, finding a constant scaled energy, ER/Mo of 3.5x10-5, or apparent stress of ~ 1 MPa, to fit the data well. The average Brune stress drop for these data is ~5 MPa. By using many stations and relative measures, I statistically show self-similar earthquake scaling. However, there are anomalous enervated and energetic events that show individual departure from the overall trend, representing the true variability in earthquake source parameters. I revisit the aRMS stress drop using recent broadband stations and strong motion accelerometers. The aRMS stress drop samples an inherently different portion of the earthquake spectrum than the Brune stress drop, and can be directly related to PGA and hence high-frequency ground motion. While the aRMS stress drop is much simpler and faster to measure, it does not model attenuation, and hence suffers from loss of signal at distances> ~20 km. At close stations, and for large earthquakes, the aRMS stress drop values are very similar to those of the Brune stress drop, yet with reduced error base on corner frequency uncertainty. That the aRMS[not] method yields stable stress drops supports the assumptions behind the formulation: that earthquake acceleration records can be considered random, band-limited, white Gaussian noise, and overall, a self-similar earthquake model. The last portion of this work focuses on five great earthquakes, Mw> 8.5, over the past 7 years. Because they are so rare, seismologists don't have much information about these devastating events. Understanding how they relate to smaller earthquakes will aid in hazard mitigation. I estimate the radiated seismic energy and apparent stress, using a novel, teleseismic empirical Green's function deconvolution. At near distances, great earthquake are too big to model, as effects from one end of the rupture will interfere with those from other parts, and local recordings are often saturated. But at far distances, ~3000 km -- 9000 km, I show that moderate earthquakes, Mw 6.5 -- 7.5 can be used as Green's functions, and are used to correct the mainshocks from path and site effects. Use of several different eGf earthquakes demonstrates the limitations on the method, but also increases the precision of the energy estimates. I find that both P and S waves give consistent energy estimates when using eGf events. Azimuthal dependence of radiated energy indicates expected rupture directivity, and can be modeled using Haskell line sources to understand the rupture process.

Download or read book Ground motion Attenuation and Earthquake Source Scaling in Eastern North America written by and published by . This book was released on 1992 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Complex Faulting Process of Earthquakes written by J. Koyama and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: In seismology an earthquake source is described in terms of a fault with a particular rupture size. The faulting process of large earthquakes has been investigated in the last two decades through analyses of long-period seismo grams produced by advanced digital seismometry. By long-period far-field approximation, the earthquake source has been represented by physical parameters such as s~ismic moment, fault dimension and earthquake mag nitude. Meanwhile, destruction often results from strong ground motion due to large earthquakes at short distances. Since periods of strong ground motion are far shorter than those of seismic waves at teleseismic distances, the theory of long-period source process of earthquakes cannot be applied directly to strong ground motion at short distances. The excitation and propagation of high-frequency seismic waves are of special interest in recent earthquake seismology. In particular, the descrip tion and simulation of strong ground motion are very important not only for problems directly relevant to earthquake engineering, but also to the frac ture mechanics of earthquake faulting. Understanding of earthquake sources has been developed by investigating the complexity of faulting processes for the case of large earthquakes. Laboratory results on rock failures have also advanced the understanding of faulting mechanisms. Various attempts have been made to simulate, theoretically and empirically, the propagation of short-period seismic waves in the heterogeneous real earth.

Download or read book Procedures for Estimating Earthquake Ground Motions written by Walter W. Hays and published by . This book was released on 1980 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Estimation of Ground Motion Parameters written by and published by . This book was released on 1978 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NUREG CR written by U.S. Nuclear Regulatory Commission and published by . This book was released on 1979 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Elementary Seismology written by Charles Richter and published by . This book was released on 1958 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy Research Abstracts written by and published by . This book was released on 1988 with total page 1224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Strong Ground Motion Seismology written by Mustafa Özder Erdik and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 609 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains selected papers presented at the NATO Advanced Study Institute on "Strong Ground Motion Seismology", held in Ankara, Turkey between June 10 and 21, 1985. The strong ground motion resulting from a major earthquake determines the level of the seismic hazard to enable earthquake engineers to assess the structural performance and the consecutive risks to the property and life, as well as providing detailed information to seismologists about its source mechanism. From the earthquake engineering point the main problem is the specification of a design level ground motion for a given source-site-structure-economic life and risk combination through deterministic and probabilistic approaches. In seismology the strong motion data provide the high frequency information to determine the rupture process and the complexity of the source mechanism. The effects of the propagation path on the strong ground motion is a research area receiving sub stantial attenuation both from earthquake engineers and seismologists. The Institute provided a venue for the treatment of the subject matter by a series of lectures on earthquake source models and near field theories; effects of propagation paths and site conditions, numerical and empirical methods for prediction; data acquisition and analysis; hazard assessment and engineering application.

Download or read book State of the art Study Concerning Near field Earthquake Ground Motion written by H. J. Swanger and published by . This book was released on 1981 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stochastic Model for Earthquake Ground Motion Using Wavelet Packets written by Yoshifumi Yamamoto and published by Stanford University. This book was released on 2011 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: For performance-based design, nonlinear dynamic structural analysis for various types of input ground motions is required. Stochastic (simulated) ground motions are sometimes useful as input motions, because unlike recorded motions they are not limited in number and because their properties can be varied systematically to study the impact of ground motion properties on structural response. This dissertation describes an approach by which the wavelet packet transform can be used to characterize complex time-varying earthquake ground motions, and it illustrates the potential benefits of such an approach in a variety of earthquake engineering applications. The proposed model is based on Thr´ainsson and Kiremidjian (2002), which use Fourier amplitudes and phase differences to simulate ground motions and attenuation models to their model parameters. We extend their model using wavelet packet transform since it can control the time and frequency characteristic of time series. The time- and frequency-varying properties of real ground motions can be captured using wavelet packets, so a model is developed that requires only 13 parameters to describe a given ground motion. These 13 parameters are then related to seismological variables such as earthquake magnitude, distance, and site condition, through regression analysis that captures trends in mean values, standard deviations and correlations of these parameters observed in a large database of recorded strong ground motions. The resulting regression equations then form a model that can be used to predict ground motions for a future earthquake scenario; this model is analogous to widely used empirical ground motion prediction models (formerly called "attenuation models") except that this model predicts entire time series rather than only response spectra. The ground motions produced using this predictive model are explored in detail, and are shown to have elastic response spectra, inelastic response spectra, durations, mean periods, etc., that are consistent in both mean and variability to existing published predictive models for those properties. That consistency allows the proposed model to be used in place of existing models for probabilistic seismic hazard analysis (PSHA) calculations. This new way to calculate PSHA is termed "simulation-based probabilistic seismic hazard analysis" and it allows a deeper understanding of ground motion hazard and hazard deaggregation than is possible with traditional PSHA because it produces a suite of potential ground motion time histories rather than simply a distribution of response spectra. The potential benefits of this approach are demonstrated and explored in detail. Taking this analysis even further, this suite of time histories can be used as input for nonlinear dynamic analysis of structures, to perform a risk analysis (i.e., "probabilistic seismic demand analysis") that allows computation of the probability of the structure exceeding some level of response in a future earthquake. These risk calculations are often performed today using small sets of scaled recorded ground motions, but that approach requires a variety of assumptions regarding important properties of ground motions, the impacts of ground motion scaling, etc. The approach proposed here facilitates examination of those assumptions, and provides a variety of other relevant information not obtainable by that traditional approach.

Download or read book U S Geological Survey Professional Paper written by and published by . This book was released on 1984 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geological Survey Professional Paper written by and published by . This book was released on 1979 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Handbook of Earthquake Engineering Seismology Part B written by William H.K. Lee and published by Elsevier. This book was released on 2003-07-23 with total page 1032 pages. Available in PDF, EPUB and Kindle. Book excerpt: The two volume International Handbook of Earthquake and Engineering Seismology represents the International Association of Seismology and Physics of the Earth's Interior's (IASPEI) ambition to provide a comprehensive overview of our present knowledge of earthquakes and seismology. This state-of-the-art work is the only reference to cover all aspects of seismology--a "resource library" for civil and structural engineers, geologists, geophysicists, and seismologists in academia and industry around the globe.Part B, by more than 100 leading researchers from major institutions of science around the globe, features 34 chapters detailing strong-motion seismology, earthquake engineering, quake prediction and hazards mitigation, as well as detailed reports from more than 40 nations. Also available is The International Handbook of Earthquake and Engineering Seismology, Part A. Authoritative articles by more than 100 leading scientists Extensive glossary of terminology plus 2000+ biographical sketches of notable seismologists

Download or read book Geological Survey Circular written by and published by . This book was released on with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: