Passive Imaging With Ambient Noise

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Passive Imaging With Ambient Noise

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Author : Josselin Garnier
language : en
Publisher: Cambridge University Press
Release Date : 2016-04-21

Passive Imaging With Ambient Noise written by Josselin Garnier and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-04-21 with Computers categories.

This multidisciplinary book provides a systematic introduction to the analysis of passive sensor array imaging using ambient noise sources.

Passive Acoustic Imaging And Monitoring Using Ambient Noise

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Author : Shane W. Lani
language : en
Publisher:
Release Date : 2012

Passive Acoustic Imaging And Monitoring Using Ambient Noise written by Shane W. Lani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Ambient sounds categories.

An approximate of the Green's function can be obtained by taking the cross-correlation of ambient noise that has been simultaneously recorded on separate sensors. This method is applied for two experiments, which illustrate the advantages and challenges of this technique. The first experiment is in the ultrasonic regime [5-30] MHz and uses capacitive micromachined ultrasonic transducer arrays to image the near field and compares the passive imaging to the conventional pulse-echo imaging. Both the array and target are immersed in a fluid with the sensors recording the fluid's random thermal-mechanical motion as the ambient noise. The second experiment is a passive ocean monitoring experiment, which uses spatiotemporal filtering to rapidly extract coherent arrivals between two vertical line arrays. In this case the ambient noise in the frequency band [250 1500] Hz is dominated by non-stationary shipping noise. For imaging purposes, the cross-correlation needs to extract the Green's function so that the imaging can be done correctly. While for monitoring purposes, the important feature is the change in arrivals, which corresponds to the environment changing. Results of both experiments are presented along with the advantages of this passive method over the more accepted active methods.

Acoustic Daylight

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Author : Chad Lawrence Epifanio
language : en
Publisher:
Release Date : 1997

Acoustic Daylight written by Chad Lawrence Epifanio and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Ocean sounds categories.

Passive Imaging Of A Spherical Inclusion By Elastic Waves

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Author : Lingxiao Zhang
language : en
Publisher:
Release Date : 2016

Passive Imaging Of A Spherical Inclusion By Elastic Waves written by Lingxiao Zhang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.

A method is proposed to detect and estimate the location of the spherical inclusion in the homogeneous isotopic elastic medium. The signals are emitted by ambient noise sources and recorded by a sensor array. The vector nature of elastic waves is exploited to find a proper imaging function to detect and locate the inclusion. We consider imaging of a spherical inclusion using seismic wave recordings.

Passive Imaging And Characterization Of The Subsurface With Distributed Acoustic Sensing

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Author : Eileen Rose Martin
language : en
Publisher:
Release Date : 2018

Passive Imaging And Characterization Of The Subsurface With Distributed Acoustic Sensing written by Eileen Rose Martin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.

Active seismic surveys for subsurface imaging are expensive and logistically difficult in populated areas where they have potential to impact day-to-day life, so continuous monitoring experiments are rarely done. I combine two methods to make continuous subsurface monitoring cheaper: estimating wave equation Green's functions from passive vibration recordings, and measuring meter-scale strain rate profiles along fiber optic cables which may already exist in urban areas or can easily be installed. These methods may make continuous high-resolution subsurface imaging possible where it was not previously, but there are challenges. The shift from particle velocity data of seismometers to axial strain rates recorded by fibers leads to different responses to the same source. Additionally, signals extracted from ambient seismic noise interferometry are masked by a fundamentally different receiver response. I use data from multiple fiber optic surface arrays: two with fiber directly coupled to the ground intended for permafrost thaw monitoring, and one with fiber sitting loosely in existing telecommunications conduits. Although these data look different, the arrival times of earthquakes at known times verify that the arrays record vibrations over a wide range of frequencies. Care must be taken to understand and mitigate the effects of non-ideal anthropogenic noise when doing ambient seismic noise in urban areas and around infrastructure. I use interferometry to extract repeatable signals for near-surface geotechnical characterization near infrastructure, even between fiber channels that are not collinear. I investigate temporal stability and changes in signals extracted throughout large arrays in the presence of a changing subsurface and noise field. As ambient noise practitioners begin using denser arrays, the typical cross-correlation process can become expensive, so I propose a new algorithm for dispersion image calculation that is an order of magnitude faster and parallelizable.

Imaging With Ambient Seismic Noise

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Author : Jason P. Chang
language : en
Publisher:
Release Date : 2018

Imaging With Ambient Seismic Noise written by Jason P. Chang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.

Whether due to naturally occurring or human-generated vibrations, the ground is never truly at rest. Though individual recordings of these vibrations appear to be noisy, there are actually spatially coherent seismic signals hidden in them. By having two receivers record this ambient seismic noise continuously and simultaneously, it is possible to extract these hidden signals with a method called passive seismic interferometry, which effectively transforms one of the receivers into a seismic source. Thus, when performed on an array of receivers, passive seismic interferometry can produce an entire virtual seismic survey at a fraction of the cost of a traditional seismic survey with active sources. These virtual responses between receivers can then be used to image the subsurface. A number of studies have successfully implemented passive seismic interferometry. However, the vast majority of them focus on extracting low-frequency microseism surface waves, which are generated by the interaction of ocean waves and the subsequent pressure variations along the sea-bottom. Though the resulting high-resolution subsurface velocity maps from these studies are impressive, they do not demonstrate the full potential of passive seismic interferometry. Hence, the goal of this thesis is to demonstrate the ability of passive seismic interferometry to extract more than just microseism surface waves. To do so, I apply the technique to three industry-scale seismic arrays located in three different environments. I first focus on urban ambient seismic noise recorded by a dense seismic array in Long Beach, California. In this environment, passive seismic interferometry using continuous recordings between 3 4 Hz extracts Rayleigh waves originating from these local roads. After tailoring my Rayleigh-wave traveltime selection criteria to account for the presence of noise sources within the array, I invert the traveltimes to produce near-surface group velocity maps that reveal structures that coincide well with those in geologic maps, including the Newport-Inglewood fault. I then switch to a shallow-water ocean-bottom node array in the North Sea to show that passive seismic interferometry can extract P-waves propagating through the water column in the ambient seismic noise field between 40 200 Hz. Examination of the virtual responses between receivers over time reveals that the major sources of seismic energy at these high frequencies are distant shipping noise and the operating platform in the center of the array. Based on the successful extraction of P-waves, I aim to extract 1D reflection profiles from the continuous data by effectively performing seismic interferometry using ambient seismic noise after up- and down-going wavefield separation. Finally, I work with ambient seismic noise recorded by a deep-water, long-offset ocean-bottom node array offshore Norway. Because of the length of the array, I focus on continuous recordings below 2 Hz, which is the microseism band. Though passive seismic interferometry in this environment extracts the commonly observed Scholte waves, it also extracts two other wave modes that have rarely been observed in ambient seismic noise. One is acoustic guided waves, which can be used to produce 1D P-wave velocity profiles. The other is critical refractions, which have never been observed in ambient seismic noise before and can potentially be used for tomography. Because of the novelty of this observation, I model one hypothesis for the natural generation of critical refractions.

Encyclopedia Of Solid Earth Geophysics

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Author : Harsh Gupta
language : en
Publisher: Springer Science & Business Media
Release Date : 2011-06-29

Encyclopedia Of Solid Earth Geophysics written by Harsh Gupta and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-06-29 with Science categories.

The past few decades have witnessed the growth of the Earth Sciences in the pursuit of knowledge and understanding of the planet that we live on. This development addresses the challenging endeavor to enrich human lives with the bounties of Nature as well as to preserve the planet for the generations to come. Solid Earth Geophysics aspires to define and quantify the internal structure and processes of the Earth in terms of the principles of physics and forms the intrinsic framework, which other allied disciplines utilize for more specific investigations. The first edition of the Encyclopedia of Solid Earth Geophysics was published in 1989 by Van Nostrand Reinhold publishing company. More than two decades later, this new volume, edited by Prof. Harsh K. Gupta, represents a thoroughly revised and expanded reference work. It brings together more than 200 articles covering established and new concepts of Geophysics across the various sub-disciplines such as Gravity, Geodesy, Geomagnetism, Seismology, Seismics, Deep Earth Processes, Plate Tectonics, Thermal Domains, Computational Methods, etc. in a systematic and consistent format and standard. It is an authoritative and current reference source with extraordinary width of scope. It draws its unique strength from the expert contributions of editors and authors across the globe. It is designed to serve as a valuable and cherished source of information for current and future generations of professionals.

Seismic Ambient Noise

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Author : Nori Nakata
language : en
Publisher: Cambridge University Press
Release Date : 2019-03-21

Seismic Ambient Noise written by Nori Nakata and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-03-21 with Nature categories.

A comprehensive overview of seismic ambient noise, covering observations, physical origins, modelling, processing methods and applications in imaging and monitoring.

Recent Trends In Wave Mechanics And Vibrations

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Author : Zuzana Dimitrovová
language : en
Publisher: Springer Nature
Release Date : 2022-10-06

Recent Trends In Wave Mechanics And Vibrations written by Zuzana Dimitrovová and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-10-06 with Technology & Engineering categories.

This volume gathers select proceedings of the 10th International Conference on Wave Mechanics and Vibrations (WMVC), held in Lisbon, Portugal, on July 4-6, 2022. It covers recent developments and cutting-edge methods in wave mechanics and vibrations applied to a wide range of engineering problems. It presents analytical and computational studies in structural mechanics, seismology and earthquake engineering, mechanical engineering, aeronautics, robotics and nuclear engineering among others. The volume will be of interest for students, researchers, and professionals interested in the wide-ranging applications of wave mechanics and vibrations.

Underwater Acoustic Modelling And Simulation

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Author : P.C. Etter
language : en
Publisher: CRC Press
Release Date : 2003-12-08

Underwater Acoustic Modelling And Simulation written by P.C. Etter and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-12-08 with Technology & Engineering categories.

Underwater Acoustic Modeling and Simulation examines the translation of our physical understanding of sound in the sea into mathematical models that can simulate acoustic propagation, noise and reverberation in the ocean. These models are used in a variety of research and operational applications to predict and diagnose the performance of complex s