Spatial Correlation Between Seismic Noise And Seam Contact
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Spatial Correlation Between Seismic Noise And Seam Contact
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Author : A. F. Lipchanskiĭ
language : en
Publisher:
Release Date : 1979
Spatial Correlation Between Seismic Noise And Seam Contact written by A. F. Lipchanskiĭ and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Coal mines and mining categories.
Empirical Analysis Of Complex Wavefields
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Author : Yixiao Sheng
language : en
Publisher:
Release Date : 2020
Empirical Analysis Of Complex Wavefields written by Yixiao Sheng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
The principal focus of this thesis is exploring the passive seismic wavefield, including both ambient seismic noise and earthquake ground motion. On the one hand, ambient noise, though appearing to be a nuisance and treated as an unwanted component, has seen flourishing applications in the past decades. However, the discrepancy between the reality of noise properties and theoretical assumptions leads to considerable bias in those applications. A better understanding of the noise wavefield is therefore crucial. One the other hand, significant earthquakes pose continuous threats to human life and habitat. Mitigating seismic hazard demands detailed knowledge of these seismic waves that carry tremendous energy and cause damage. In this thesis, I first give a background introduction on seismic wavefields and the connection between seismic noise and earthquake ground shaking. Then I demon- strate that it's possible to convert the noise data into signals, which can be used to simulate long-period earthquake ground motion. I introduce an improved multi-component C3 method. It enhances the signal-to-noise ratio of the simulation and yields more reliable amplitude estimates. Starting from a puzzling observation, I carefully examine the C3 method and propose a new interpretation of it. Inspired by this insight, I develop a modified signal processing procedure that increases the resolving power of traditional seismic interferometry techniques on relatively sparse networks. I then switch the focus to the coda of repeating earthquakes, which are used to extract velocity perturbations. Studying earthquake coda provides insights into the coda of correlations. The chapter following focuses on the spatial variability of earthquake ground motions by exploring the similarity of earthquake recordings on dense seismic arrays. The spatial coherence revealed from waveform similarity is consistent with that from amplitude measurement.
Seismic Noise Attenuation
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Author : E. R. Kanasewich
language : en
Publisher: Pergamon
Release Date : 1990
Seismic Noise Attenuation written by E. R. Kanasewich and has been published by Pergamon this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Science categories.
This volume attempts to examine the sequence of operations required for the extraction of the flow of messages from a background of random noise and unwanted signals. The analysis will involve the use of frontier integrals, autocorrelation, cross correlation, power spectral studies and convolution or filtering. Attention will be made to the definition of signal and noise and how these may change under different processing methods.
Large Array Signal And Noise Analysis Correlation Between Storms At Sea And Lasa Long Period Noise
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Author : Frank H. Binder
language : en
Publisher:
Release Date : 1967
Large Array Signal And Noise Analysis Correlation Between Storms At Sea And Lasa Long Period Noise written by Frank H. Binder and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with categories.
Wavenumber and frequency spectra of nine long-period noise samples recorded at the Montana LASA were compared to wave-height charts for the nearest available time. No attempt is made to give a comprehensive explanation of the relationships between seawave activity and long-period seismic noise. A study of these nine noise samples suggests that, in general, the spatial organization of the LASA long-period noise cannot be predicted by examination of wave-height charts. With one exception, strong point-like noise sources generally seem to be associated with areas of high wave activity impinging on a land mass. Strong wave activity in the Pacific Basin not in contact with any land mass does not generate observable long-period noise. Relatively quiet days do not show areas of strong wave activity impinging on land masses. (Author).
Estimating Local And Near Regional Velocity And Attenuation Structure From Seismic Noise
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Author :
language : en
Publisher:
Release Date : 2008
Estimating Local And Near Regional Velocity And Attenuation Structure From Seismic Noise written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
This paper investigates the utility of computing Time-Domain Green's Functions (TDGF) to be used for estimating velocity and attenuations structure for the purposes of nuclear explosion monitoring over local and near-regional distances. Our objective is to extend and apply the methodology of deriving TDGF for propagation between two receivers by cross correlation of seismic noise and/or coda of earthquakes observed at the receivers and concentrates on the following four tasks: (1) The specific noise spectrum of the ocean microseism needs to be accounted for and compensated for in order to be able to measure group velocities across a wider bandwidth. (2) We are investigating methods to obtain spatial variations in attenuation using ambient noise. (3) Mean-phase velocity-dispersion curves are calculated for the TUCAN seismic array in Costa Rica and Nicaragua from ambient seismic noise using two independent methods: noise cross correlation and beamforming. (4) From a data set recorded by a small-scale array (~4 km aperture).
High Resolution Seismic Reflection Techniques For Mapping Coal Seams From The Surface
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Author : C. Melvin Lepper
language : en
Publisher:
Release Date : 1976
High Resolution Seismic Reflection Techniques For Mapping Coal Seams From The Surface written by C. Melvin Lepper and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Coal mines and mining categories.
Advances And Applications Of Artificial Intelligence In Geoscience And Remote Sensing
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Author : Peng Zhenming
language : en
Publisher: Frontiers Media SA
Release Date : 2023-08-30
Advances And Applications Of Artificial Intelligence In Geoscience And Remote Sensing written by Peng Zhenming and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-08-30 with Science categories.
Geographic Information Systems For Geoscientists
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Author : Graeme F. Bonham-Carter
language : en
Publisher: Elsevier
Release Date : 2014-05-18
Geographic Information Systems For Geoscientists written by Graeme F. Bonham-Carter and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-05-18 with Travel categories.
Geographic Information Systems for Geoscientists: Modelling with GIS provides an introduction to the ideas and practice of GIS to students and professionals from a variety of geoscience backgrounds. The emphasis in the book is to show how spatial data from various sources (principally paper maps, digital images and tabular data from point samples) can be captured in a GIS database, manipulated, and transformed to extract particular features in the data, and combined together to produce new derived maps, that are useful for decision-making and for understanding spatial interrelationship. The book begins by defining the meaning, purpose, and functions of GIS. It then illustrates a typical GIS application. Subsequent chapters discuss methods for organizing spatial data in a GIS; data input and data visualization; transformation of spatial data from one data structure to another; and the combination, analysis, and modeling of maps in both raster and vector formats. This book is intended as both a textbook for a course on GIS, and also for those professional geoscientists who wish to understand something about the subject. Readers with a mathematical bent will get more out of the later chapters, but relatively non-numerate individuals will understand the general purpose and approach, and will be able to apply methods of map modeling to clearly-defined problems.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1993
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Aeronautics categories.
Deep Rock Mass Engineering Excavation Monitoring And Control
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Author : Zhiqiang Yin
language : en
Publisher: Frontiers Media SA
Release Date : 2022-11-14
Deep Rock Mass Engineering Excavation Monitoring And Control written by Zhiqiang Yin and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-11-14 with Science categories.