Results 31 to 40 of about 227 (164)

Physical and mechanical rock properties of a heterogeneous volcano: the case of Mount Unzen, Japan [PDF]

Solid Earth, 2021
Volcanoes represent one of the most critical geological settings for hazard modelling due to their propensity to both unpredictably erupt and collapse, even in times of quiescence.
J. E. Kendrick, J. E. Kendrick, L. N. Schaefer, L. N. Schaefer, J. Schauroth, A. F. Bell, O. D. Lamb, O. D. Lamb, A. Lamur, T. Miwa, R. Coats, Y. Lavallée, B. M. Kennedy   +12 more
doaj   +1 more source

Three-station interferometry and tomography: coda versus direct waves

Geophysical Journal International, 2020
SUMMARY Traditional two-station ambient noise interferometry estimates the Green’s function between a pair of synchronously deployed seismic stations. Three-station interferometry considers records observed three stations at a time, where two of the stations are considered receiver–stations and the third is a source–station.
Shane Zhang, Lili Feng, Michael H Ritzwoller   +2 more
openaire   +4 more sources

Perturbation analysis of travel-time accuracy for core phases reconstructed from seismic interferometry [PDF]

Solid Earth
Correlating late coda waves from large earthquakes produces stable waveforms that approximate inter-station core phases. However, the properties of these coda waves often violate the strict assumptions underlying classical Green's function retrieval ...
Y. Xia, Y. Xia, Y. Xia, X. Feng, X. Feng, X. Chen, X. Chen   +6 more
doaj   +1 more source

Validation of a thermal bias control technique for Coda Wave Interferometry (CWI) [PDF]

Ultrasonics, 2013
The Coda Wave Interferometry (CWI) analysis serves to monitor the variation of propagation velocity in a heterogeneous medium with high precision (10(-3)% in relative terms). In combination with acoustoelastic theory, this type of analysis offers an NDT method for stress evaluation and/or damage detection.
Zhang, Yuxiang, Abraham, Odile, Tournat, Vincent, Le Duff, Alain, Lascoup, Bertrand, Loukili, Ahmed, Grondin, Frédéric, Durand, Olivier   +7 more
openaire   +3 more sources

Correlation between Coda Wave and Stresses in Uni-Axial Compression Concrete

Applied Sciences, 2018
Stresses in structures are usually converted by measured strains based on corresponding constitutive relations of materials. However, it is difficult to determine the constitutive relation of the material accurately, which leads to significant ...
Jinquan Zhang, Bing Han, Hui-Bing Xie, Li Zhu, Gang Zheng, Wenwu Wang   +5 more
doaj   +1 more source

Elastic Strain Effects on Wave Scattering: Implications for Coda Wave Interferometry (CWI) [PDF]

Journal of Geophysical Research: Solid Earth, 2020
AbstractCoda Wave Interferometry (CWI) is a highly sensitive monitoring technique built on the sensitivity of elastic coda waves to small changes in a diffusive medium. However, a clear connection between the physical processes involved in the evolution of the medium and the time changes observed by CWI has not been clearly described yet.
Azzola, Jerome, Schmittbuhl, Jean, Zigone, Dimitri, Lengliné, Olivier, Masson, Frédéric, Magnenet, Vincent   +5 more
openaire   +4 more sources

Coda wave interferometry during the heating of deep geothermal reservoir rocks

Geothermal Energy, 2018
Coda wave interferometry (CWI) is a high-resolution technique that aims at tracking small changes in a diffusive medium from the time correlation of seismic waveforms.
Jérôme Azzola, Luke Griffiths, Jean Schmittbuhl, Dimitri Zigone, Vincent Magnenet, Frédéric Masson, Michael Heap, Patrick Baud   +7 more
doaj   +1 more source

Coda wave interferometry and constraints on relative earthquake locations

ASEG Extended Abstracts, 2006
The majority of earthquake location techniques, even modern techniques such as double difference, use only a small component of the seismic waveform or seismogram. A new technique to aid earthquake location is coda wave interferometry (CWI). In this method the cross correlation of coda waves, the later arriving waves in a seismogram, are used to ...
David Robinson, David Robinson, David Robinson   +2 more
openaire   +1 more source

Seismic Constraints on Damage Growth Within an Unstable Hanging Glacier

Geophysical Research Letters, 2023
Forecasting hanging glacier instabilities remain challenging as sensing technology focusing on the ice surface fails to detect englacial damage leading to large‐scale failure.
Małgorzata Chmiel, Fabian Walter, Antoine Pralong, Lukas Preiswerk, Martin Funk, Lorenz Meier, Florent Brenguier   +6 more
doaj   +1 more source

An Investigation of Pump-Induced Conditioning in NCWI of Concrete

e-Journal of Nondestructive Testing
Coda Wave Interferometry (CWI) is a highly sensitive ultrasonic method for damage detection, but it often fails to see elastic nonlinearities such as closed cracks.
Shilan Shaabani, Pierric Mora, Parisa Shokouhi, Olivier Durand, Odile Abraham   +4 more
doaj   +1 more source