Céline Hadziioannou
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View article: Imprints of time-dependent microseism source distributions on the coda of correlations
Imprints of time-dependent microseism source distributions on the coda of correlations Open
SUMMARY Seismic interferometry, applied to continuous seismic records, yields correlation wavefields that can be exploited for information about Earth’s subsurface. The coda of the correlation wavefield has been described as multiply scatt…
View article: Stress- and Time-dependent Variations of Elastic Properties for Integrity Assessment in a Reinforced Concrete Test Bridge
Stress- and Time-dependent Variations of Elastic Properties for Integrity Assessment in a Reinforced Concrete Test Bridge Open
In lab experiments, it has been observed that the stress–and time-dependent elastic properties of a complex material at a structural scale perform accordingly to its composition at a microstructural level. We seek complementary practices t…
View article: Shallow crustal structures of the Indian ocean derived from compliance function analysis
Shallow crustal structures of the Indian ocean derived from compliance function analysis Open
SUMMARY We used broad-band ocean bottom seismometer data from the RHUM-RUM (Réunion Hotspot and Upper Mantle - Réunions Unterer Mantel) experiment to derive the compliance function and estimate the shear velocity ($V_s$) structure of the s…
View article: Wave-Screening Methods for Prestress-Loss Assessment of a Large-Scale Post-Tensioned Concrete Bridge Model Under Outdoor Conditions
Wave-Screening Methods for Prestress-Loss Assessment of a Large-Scale Post-Tensioned Concrete Bridge Model Under Outdoor Conditions Open
This paper presents advancements in structural health monitoring (SHM) techniques, with a particular focus on wave-screening methods for assessing prestress loss in a large-scale prestressed concrete (PC) bridge model under outdoor conditi…
View article: Unlocking the potential of single stations to replace seismic arrays
Unlocking the potential of single stations to replace seismic arrays Open
We introduce Virtual Seismic Arrays, which predict full array recordings from a single reference station, eliminating the need for continuous deployment of all stations. This innovation can reduce costs and logistical challenges while main…
View article: Predictive modelling of seismic wave fields: learning the transfer function using encoder–decoder networks
Predictive modelling of seismic wave fields: learning the transfer function using encoder–decoder networks Open
SUMMARY Wouldn't it be beneficial if we could predict the time-series at a seismic station even if the station no longer exists? In geophysical data analysis, this capability would enhance our ability to study and monitor seismic events an…
View article: Seismic noise contributions to European X-ray free-electron laser bunch arrival time jitter from ocean-generated microseism
Seismic noise contributions to European X-ray free-electron laser bunch arrival time jitter from ocean-generated microseism Open
Measurements of the bunch arrival times at the European X-ray free-electron laser show noise contributions in the spectral range between 0.05 and 0.5 Hz with peak-to-peak jitter of up to 25 fs. Correlation with distributed acoustic sensing…
View article: Predictive modeling of seismic wave fields: Learning the transfer function using encoder-decoder networks
Predictive modeling of seismic wave fields: Learning the transfer function using encoder-decoder networks Open
Wouldn't it be beneficial if we could predict the time series at a seismic station even if the station no longer exists? In geophysical data analysis, this capability would enhance our ability to study and monitor seismic events and seismi…
View article: Characterizing Rotational Ground Motions: Implications for Earthquake-Resistant Design of Bridge Structures
Characterizing Rotational Ground Motions: Implications for Earthquake-Resistant Design of Bridge Structures Open
Earthquakes cause catastrophic damage to buildings and loss of human life. Civil engineers across the globe design earthquake-resistant buildings to minimize this damage. Conventionally, the structures are designed to resist the translatio…
View article: Seasonality of Microseisms in Southern California from 6C Ground Motions
Seasonality of Microseisms in Southern California from 6C Ground Motions Open
View article: Bridge monitoring using six-component ground motion measurements
Bridge monitoring using six-component ground motion measurements Open
In the context of ageing infrastructure, structural health monitoring is crucial for safety and integrity assessment, as well as for planning preventive maintenance. While classical methods rely on single-component sensors to track vibrati…
View article: Stacking of Distributed Dynamic Strain Reveals Link Between Seismic Velocity Changes and the 2020 Unrest in Reykjanes
Stacking of Distributed Dynamic Strain Reveals Link Between Seismic Velocity Changes and the 2020 Unrest in Reykjanes Open
In this study, we measure seismic velocity variations during two cycles of crustal inflation and deflation in 2020 on the Reykjanes peninsula (SW Iceland) by applying coda wave interferometry to ambient noise recorded by distributed dynami…
View article: Link between seismic velocity changes and the 2020 unrest in Reykjanes revealed by wavelength-dependent spatial stacking of distributed dynamic strain
Link between seismic velocity changes and the 2020 unrest in Reykjanes revealed by wavelength-dependent spatial stacking of distributed dynamic strain Open
The Reykjanes Peninsula, due to its active volcanism, has been subject of numerous studies. The eruption of Mount Fagradalsfjall in March 2021 followed a series of crustal inflation and subsidence cycles in 2020, as documented by GNSS stat…
View article: Time- and stress-dependent elastic properties in a concrete structure; spotting internal damage footprints
Time- and stress-dependent elastic properties in a concrete structure; spotting internal damage footprints Open
Time- and stress-dependency of elastic properties are features particularly observed in a variety of complex solids, ranging from steel, polymers, and cracked structures, to rocks and concrete. Recently, considerable effort has been made t…
View article: Exploring Unsupervised Clustering of Seismic Noise Sources in Urban DAS Data: A Methodology Guide
Exploring Unsupervised Clustering of Seismic Noise Sources in Urban DAS Data: A Methodology Guide Open
Seismic measurements record the superposition of many seismic sources, with anthropogenic ones dominating frequencies above 1 Hz. While the anthropogenic seismic vibrations in urban areas are too small to influence daily human life, measur…
View article: Sensitivity of coda correlation wavefields to spatio-temporal variations of microseism noise sources
Sensitivity of coda correlation wavefields to spatio-temporal variations of microseism noise sources Open
Previous research suggests that continuous seismic noise records can effectively extract information about the properties of the Earth's subsurface. The coda of the correlation wavefield between station pairs shows sensitivity to crustal h…
View article: Analysis of Vibration and Ultrasonic Signals to Identify Prestress Loss in a Concrete Bridge Model
Analysis of Vibration and Ultrasonic Signals to Identify Prestress Loss in a Concrete Bridge Model Open
View article: Continuous isolated noise sources induce repeating waves in the coda of ambient noise correlations
Continuous isolated noise sources induce repeating waves in the coda of ambient noise correlations Open
Continuous excitation of isolated noise sources leads to repeating wave arrivals in cross correlations of ambient seismic noise, including throughout their coda. These waves propagate from the isolated sources. We observe this effect on co…
View article: Gliding tremors associated with the 26 second microseism in the Gulf of Guinea
Gliding tremors associated with the 26 second microseism in the Gulf of Guinea Open
A location in the Gulf of Guinea, which emits monochromatic seismic waves at 26-second period, seemingly continuously, was identified in the 1960s. However, the origin of these seismic waves remains enigmatic to date. Here we use three-com…
View article: Continuous isolated noise sources induce repeating waves in the coda of ambient noise correlations
Continuous isolated noise sources induce repeating waves in the coda of ambient noise correlations Open
Continuous excitation of isolated noise sources leads to repeating wave arrivals in cross correlations of ambient seismic noise, including throughout their coda. These waves propagate from the isolated sources. We observe this effect on co…
View article: Monitoring material properties of civil engineering structures with 6C point measurements
Monitoring material properties of civil engineering structures with 6C point measurements Open
Observing motion within a building in six degrees of freedom (three components of translational motion plus three components of rotational motion) opens completely new approaches to structural health monitoring. Inspired by inertial naviga…
View article: Exploring multiscale nonlinear NDTs for damage detection in concrete structures
Exploring multiscale nonlinear NDTs for damage detection in concrete structures Open
It has been shown that non-destructive tests (NDTs) based on nonlinear wave propagation are more sensitive to detecting very small damages in concrete structures than linear techniques. With the aim of exploring the nonlinear effects in ci…
View article: Array beamforming on ambient seismic noise correlations reveals repeating direct waves in the coda
Array beamforming on ambient seismic noise correlations reveals repeating direct waves in the coda Open
Over the past two decades, the ambient seismic noise correlation method has revolutionized our ability to investigate the Earth's subsurface structure. Perfect reconstruction of the cross correlation wavefields towards Green's function dem…
View article: TwistPy: An open-source Python toolbox for wavefield inertial sensing techniques
TwistPy: An open-source Python toolbox for wavefield inertial sensing techniques Open
In the past decade, significant progress has been made in the acquisition and processing of seismic wavefield gradient data (e.g., recordings of ground strain and rotation). When combined with conventional multicomponent seismic data, wave…
View article: Using Rotational Motions to understand material damage in Civil Engineering structure
Using Rotational Motions to understand material damage in Civil Engineering structure Open
The increasing evidence of rotational motions due to earthquakes is now motivating civil engineers to investigate the effects of rotational ground motions on structures. With the advancement in instrumentation techniques, rotational sensor…
View article: Wave field prediction for denoising of seismic measurements using an autoencoder network
Wave field prediction for denoising of seismic measurements using an autoencoder network Open
The adoption of machine learning in different sectors demonstrates a huge potential of multiple techniques applicable to learn specific features of a dataset. We aim to make use of machine learning methods to predict the development of sei…
View article: The impact of isolated noise sources on correlation wavefields
The impact of isolated noise sources on correlation wavefields Open
Seismic interferometry gives rise to a correlation wavefield that is closely related to the Green’s function under the condition of uniformly distributed noise sources. Asymmetric correlation wavefields result from the violation of t…
View article: Can we monitor shallow groundwater using ambient seismic noise?
Can we monitor shallow groundwater using ambient seismic noise? Open
Nowadays, the majority of detailed information about groundwater is acquired by wells that provide limited insight in time and especially space. Therefore, it would be interesting to monitor groundwater by continuously measuring seismic ve…
View article: Beamforming of Rayleigh and Love Waves in the Course of Atlantic Cyclones
Beamforming of Rayleigh and Love Waves in the Course of Atlantic Cyclones Open
The main sources of the ambient seismic wavefield in the microseismic frequency band (peaking in the ∼0.04–0.5 Hz range) are earth's oceans, namely the wind‐driven surface gravity waves (SGW) that couple oscillations into the seafloor and …
View article: Seismic interferometry in the presence of an isolated noise source
Seismic interferometry in the presence of an isolated noise source Open
Seismic interferometry gives rise to a correlation wavefield that is closely related to the Green’s function under the condition of uniformly distributed noise sources. In the presence of an additional isolated noise source, a second contr…