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Chapter and Conference Paper
Some physical properties of the Burridge-Knopoff model
The dynamics of the discrete Burridge-Knopoff model, initially presented for earthquake rupture, is analyzed here as a function of the main physical parameters. This discrete array of massive spring-connected ...
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Chapter
Propagation Of An Interfacial Crack Front In A Heterogeneous Medium: Experimental Observations
We study experimentally the propagation of an inter-facial crack through a weak plane of a transparent Plexiglas block. The toughness is controlled artificially by a sand blasting procedure and fluctuates loca...
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Article
R-curve behavior and roughness development of fracture surfaces
We investigate the idea that the fractal geometry of fracture surfaces in quasibrittle materials such as concrete, rock, wood and various composites can be linked to the toughening mechanisms. Recently, the co...
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Article
Influence of the specimen geometry on R-curve behavior and roughening of fracture surfaces
Recently the R-curve behavior observed on quasi-brittle materials was proposed to be related to the roughness development of fracture surfaces. However, many experiments have shown that the R-curve behavior is no...
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Article
Scaling and dynamics of an interfacial crack front
We report on in situ observations with a high speed CCD camera of an in-plane crack propagating through a transparent heterogeneous Plexiglas block. The toughness is controlled artificially and fluctuates spatial...
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Chapter and Conference Paper
SELF-AFFINE SCALING DURING INTERFACIAL CRACK FRONT PROPAGATION
We have performed an experimental study of slow crack front propagation through a weak plane of a transparent Plexiglas block. Spatial random toughness fluctuations along the weak interface generate a rough cr...
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Article
Characterization of Fault Roughness at Various Scales: Implications of Three-Dimensional High Resolution Topography Measurements
Accurate description of the topography of active fault surfaces represents an important geophysical issue because this topography is strongly related to the stress distribution along fault planes, and therefor...
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Chapter
Characterization of Fault Roughness at Various Scales: Implications of Three-Dimensional High Resolution Topography Measurements
Accurate description of the topography of active fault surfaces represents an important geophysical issue because this topography is strongly related to the stress distribution along fault planes, and therefor...
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Chapter
Performance of Image Correlation Techniques for Landslide Displacement Monitoring
The objective of this work is to present the applicability of image correlation techniques (applied to very-high resolution terrestrial optical photographs and to very dense Terrestrial Laser Scanning (TLS) po...
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Article
The long precursory phase of most large interplate earthquakes
Foreshocks precede some—but not all—earthquakes. Analysis of all earthquakes larger than magnitude 6.5 that occurred between 1999 and 2011 shows that earthquakes at plate boundaries are often preceded by incre...
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Article
Open AccessInduced seismicity in EGS reservoir: the creep route
Observations in enhanced geothermal system (EGS) reservoirs of induced seismicity and slow aseismic slip ruptures on related faults suggest a close link between the two phenomena.
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Article
Open AccessTwo-dimensional THM modelling of the large scale natural hydrothermal circulation at Soultz-sous-Forêts
A two-dimensional numerical model is developed for the Soultz-sous-Forêts reservoir from an idealized cross-section containing six homogeneous horizontal layers. The considered constitutive equations are those...
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Article
Open AccessMechanical origin of b-value changes during stimulation of deep geothermal reservoirs
The distribution of induced-earthquake magnitudes in deep geothermal reservoirs is a classical tool for monitoring reservoirs. It typically shows some important fluctuations through time and space. Despite bei...
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Article
Open AccessUplift around the geothermal power plant of Landau (Germany) as observed by InSAR monitoring
Several centimetres of uplift were observed extending over a square-kilometre area around the geothermal site of Landau, Germany.
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Article
Open AccessCharacterization of ambient seismic noise near a deep geothermal reservoir and implications for interferometric methods: a case study in northern Alsace, France
Ambient noise correlation techniques are of growing interest for imaging and monitoring deep geothermal reservoirs. They are simple to implement and can be performed continuously to follow the evolution of th...
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Article
Open AccessHow do permeable fractures in the Triassic sediments of Northern Alsace characterize the top of hydrothermal convective cells? Evidence from Soultz geothermal boreholes (France)
The thermal regime of the Upper Rhine Graben (URG) is characterized by a series of anomalies near Soultz-sous-Forêts (France), Rittershoffen (France), and Landau (Germany). These temperature anomalies are asso...
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Article
A self-affine geometrical model of dynamic RT-PMMA fractures: implications for fracture energy measurements
Profilometric imaging of fracture surfaces of rubber toughened polymer has been performed at two different resolutions (a) at large scales [10 ...
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Article
Open AccessCoda wave interferometry during the heating of deep geothermal reservoir rocks
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. CWI has been widely used in recent years ...
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Article
Open AccessTHM modeling of hydrothermal circulation at Rittershoffen geothermal site, France
The Rittershoffen deep geothermal project located 6 km east from Soultz-sous-Forts EGS site (France) includes a doublet GRT-1 and GRT-2 to exploit the geothermal resource at the sediments–granite transition wh...
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Article
A Stochastic Study of Flow Anisotropy and Channelling in Open Rough Fractures
The quantification of fluid flow in rough fractures is of high interest for reservoir engineering, especially for deep geothermal applications. Herein, rough self-affine fractures are stochastically generated ...
