Searched for: subject%3A%22Coda%22
(1 - 17 of 17)
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Veltmeijer, A.V. (author)
Activities underground, such as gas extraction or fluid injection, can disturb the natural stresses present and can cause human-induced earthquakes along pre-existing faults. Even though they are related to engineering, these earthquakes are currently unpredictable. Monitoring and understanding how these earthquakes occur are essential for a...
doctoral thesis 2024
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Veltmeijer, A.V. (author), Naderloo, M. (author), Pluymakers, Anne (author), Barnhoorn, A. (author)
Induced earthquakes are still highly unpredictable, and often caused by variations in pore fluid pressure. Monitoring and understanding the mechanisms of fluid-induced fault slip is essential for seismic risk mitigation and seismicity forecasting. Fluid-induced slip experiments were performed on critically stressed faulted sandstone samples,...
journal article 2024
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Veltmeijer, A.V. (author), Naderloo, M. (author), Barnhoorn, A. (author)
Forecasting the occurrence of natural hazards, such as earthquakes or landslides, remain very challenging. These hazards are often caused by stress changes in the subsurface, therefore detecting and monitoring these changes can help the prediction and mitigation. Active ultrasonic transmission experiments were performed on Red Pfaelzer...
journal article 2024
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Hartstra, I.E. (author), Wapenaar, C.P.A. (author)
Previous studies indicate that scattering may pose a trade-off for the performance of seismic interferometry (SI) applications for retrieving body-wave reflections of a target reflector. While it has been demonstrated that a higher scattering strength of the overburden improves the Green's function estimated by cross-correlation SI, other...
journal article 2023
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Cheng, H. (author), Weemstra, C. (author), Hendriks, M.A.N. (author), Yang, Y. (author)
Coda wave interferometry (CWI) holds promise as a technique for concrete stress monitoring. This is because the coda, which consists of multiply scattered arrivals, is the result of propagation through the medium over large distances. As such, it is sensitive to both minute structural changes and small velocity changes in that medium....
journal article 2023
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Fu, Danny (author)
In recent years, the area of structural engineering has found new interesting prospects in the theory of waves. The acoustoelastic properties of materials are utilized in a new promising structural health monitoring (SHM) technique. The propagation of ultrasonic waves through stressed elements gives the ability to find invaluable information on...
master thesis 2022
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Ouali, Mouad (author)
The Dutch infrastructure counts many bridges, the majority of which are built in concrete. These bridges have been designed and constructed according to safety codes. A lot of these bridges date from the previous century and have been designed conform outdated safety codes. Therefore, the main problem<br/>of these bridges is the uncertainty with...
master thesis 2021
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Zotz-Wilson, R.D. (author)
We all monitor the world around us through waves. After about sixteen weeks in the womb, the ears and eyes of an infant child begin to deliver the first signals of light and sound waves to the brain. In fact, one could argue that consciousness itself is the feeling one receives when processing large amounts of wavefield data. Despite the...
doctoral thesis 2020
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Zotz-Wilson, R.D. (author), Douma, L.A.N.R. (author), Sarout, Joel (author), Dautriat, Jeremie (author), Dewhurst, David (author), Barnhoorn, A. (author)
Using active ultrasonic source survey data, coda wave decorrelation (CWD) time-lapse imaging during the triaxial compression of Whitby Mudstone cores provides a 3-D description of the evolution and redistribution of inelastic strain concentrations. Acoustic emissions (AEs) monitoring is also performed between any two consecutive surveys. From...
journal article 2020
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Verdel, Arie (author), Boullenger, Boris (author), Martins, Joana E. (author), Obermann, Anne (author), Toledo Zambrano, Tania (author), Jousset, Philippe (author)
Integration of results from active seismic, passive seismic and well data reduces the uncertainties of several subsurface parameters that are of interest for cost-effective geothermal production operations in Los Humeros. In this study, we present results from the application of ambient noise seismic interferometry (ANSI) to retrieve zero-offset...
conference paper 2019
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Kevinly, Christopher (author)
Coda wave interferometry is a technique used in the field of seismology, which utilizes the later part of the signal (coda) to detect subtle changes in a medium. In recent years, the application of coda wave interferometry to concrete structure has been assessed for structural health monitoring purposes. Smart aggregate is a sensor which...
master thesis 2018
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Epple, Niklas (author)
Concrete is the most widely used building material in the world and its stability assessment is of utmost importance for society. Ultrasonic measurements are one tool for investigation of concrete stability. The goal of those measurements is the derivation of damage sensitive parameters. The way ultrasound diffuses through concrete is affected...
master thesis 2018
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Lindner, F. (author), Weemstra, C. (author), Walter, F. (author), Hadziioannou, C. (author)
In seismology, coda wave interferometry (CWI) is an effective tool to monitor time-lapse changes using later arriving, multiply scattered coda waves. Typically, CWI relies on an estimate of the medium's impulse response. The latter is retrieved through simple time-averaging of receiver-receiver cross-correlations of the ambient field, that is...
journal article 2018
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Boerrigter, T.J. (author)
Coda Wave Interferometry analysis is studied for rocks subjected to brittle deformation which is induced by an Uniaxial Compressive Strength testing machine. Ultrasonic pulses, 1 MHz and 2.25MHz, are sent through rock samples and recorded throughout the loading up-to failure. A novel method is proposed, the rolling cross correlation, which can...
master thesis 2017
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Hartstra, I.E. (author), Almagro Vidal, C. (author), Wapenaar, C.P.A. (author)
Our objective is to complement lithospheric seismic tomography with an interferometric method to retrieve high-resolution reflectivity images from local earthquake recordings. The disadvantage of using local earthquakes for the retrieval of reflected body-waves is their usual sparse distribution. We propose an alternative formulation of passive...
journal article 2017
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Mackenbach, C.M. (author), Ang, A.W.Z. (author)
KeyLocker, a start-up developing cryptographic products that put the control of encryption keys into the hands of the end-users, has requested a review of their own software development process. During their first year of existence, the company experienced problems in following software development methodologies, sharing knowledge effectively...
bachelor thesis 2015
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Hartstra, I.E. (author), Wapenaar, C.P.A. (author)
We discuss a method to interferometrically retrieve the body wave reflection response from local high-frequency scattering coda wave fields with the purpose to obtain an input dataset suitable for the application of advanced exploration-type imaging methods
conference paper 2015
Searched for: subject%3A%22Coda%22
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