Results 21 to 30 of about 227 (164)
Source Separation and Medium Change of Contained Chemical Explosions from Coda Wave Interferometry
The Seismic Record, 2021 Differences in the seismic coda of neighboring events can be used to investigate source location offsets and medium change with coda wave interferometry (CWI).
Sean R. Ford, William R. Walter
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Probing environmental and tectonic changes underneath Mexico City with the urban seismic field [PDF]
Solid Earth, 2023 The sediments underneath Mexico City have unique mechanical properties that give rise to strong site effects. We investigated temporal changes in the seismic velocity at strong-motion and broadband seismic stations throughout Mexico City, including sites
L. A. Ermert +8 more
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Implementation of Ultrasonic Coda Wave Interferometry on a Real Bridge [PDF]
Structural Health Monitoring 2019, 2019 Urbanization becomes increasingly important in our modern life. This is undoubtedly a huge opportunity and challenge for construction industry. More and more bridges are constructed to improve the infrastructure and develop the economy. For more than a century, reinforced concrete bridges are the most common bridges due to its durability, relatively ...
WANG, XIN +3 more
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Precursory changes in wave velocity for coal and rock samples under cyclic loading
Results in Physics, 2019 Elastic wave velocity is a critical parameter in evaluating rock stability and integrity. Temporal changes in wave velocity during mine dynamic hazards including rockburst and gas outburst might potentially illuminate physical processes associated with ...
Haishan Jia +4 more
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Coda-wave interferometry and the Marchenko method
, 2020 <p>Coda-wave interferometry, introduced by Snieder and co-workers, employs the relative high sensitivity of the scattering coda in an acoustic or seismic response to time-lapse changes of the propagation velocity and/or structure.
Kees Wapenaar, Johno van IJsseldijk
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Correcting for bias due to noise in coda wave interferometry [PDF]
Geophysical Journal International, 2006 SUMMARY Coda wave interferometry (CWI) utilizes multiply scattered waves to diagnose small changes in a medium by using the scattering medium as an interferometer. Since the medium is usually stationary over the duration of a seismic experiment, different (non-overlapping) time windows in the coda allow for independent estimates of the medium ...
Huub Douma, Roel Snieder
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Frequency selection for coda wave interferometry in concrete structures
Ultrasonics, 2017 This study contributes to the establishment of frequency recommendations for use in coda wave interferometry structural health monitoring (SHM) systems for concrete structures. To this end, codas with widely different central frequencies were used to detect boreholes with different diameters in a large concrete floor slab, and to track increasing ...
Patrik, Fröjd, Peter, Ulriksen
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Frontiers in Earth Science, 2021 Study of the mechanical response of rock slopes to moderate earthquakes is important for understanding the local rheology of landslide and earthquake interactions and for mitigating the risks associated with subsurface geological processes in ...
Huibao Huang +3 more
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Continuous subsurface velocity measurement with coda wave interferometry [PDF]
Journal of Geophysical Research: Solid Earth, 2008 A 1‐month field experiment was conducted near Kunming in Yunnan Province, China, to continuously monitor subsurface velocity variations along different baselines. The experiment site is located 10 km west to the seismically very active Xiaojiang fault zone.
Baoshan Wang +4 more
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A Portable Low-Cost Ultrasound Measurement Device for Concrete Monitoring
Inventions, 2021 This paper describes a new ultrasonic measuring device called “W-Box”. It was developed based on the requirements of the DFG Forschergruppe (research unit) CoDA for a portable device for monitoring of concrete specimens, models and actual structures ...
Daniel Fontoura Barroso +2 more
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