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17 results for “mechanics of faulting”
Growth-related formation mechanism of I3-type basal stacking fault in epitaxially grown hexagonal Ge-2H
<p>The hexagonal-2H crystal phase of Ge recently emerged as a promising direct bandgap semiconductor in the mid-infrared range providing new prospects of additional opto-electronic functionalities of group-IV semiconductors (Ge and SiGe). The controlled synthesis of such hexagonal (2H) Ge phase is a challenge that can be overcome by using wurtzite GaAs nanowires as a template. However, depending on growth conditions, unusual basal stacking faults (BSFs) of I<sub>3</sub>-type are formed in the metastable 2H structure. The growth of such core/shell heterostructures is observed <em>in situ</em> and in real-time by means of environmental transmission electron microscopy using chemical vapour deposition. The observations provide direct evidence of a step-flow growth of Ge-2H epilayers and reveal the growth-related formation of I<sub>3</sub>-BSF during unstable growth. Their formation conditions are dynamically investigated. Through these <em>in situ</em> observations, we can propose a scenario for the nucleation of I<sub>3</sub>-type BSFs that is likely valid for any metastable hexagonal 2H or wurtzite structures grown on m-plane substrates. Conditions are identified to avoid their formation for perfect crystalline synthesis of SiGe-2H.</p> <p>This data set contains all the processed supporting videos of in-situ TEM observations .</p> <p> </p>
Laboratory evidence supporting a mechanical model describing the dynamic formation of fault damage asymmetry (data)
<p>Data from the paper: Laboratory evidence supporting a mechanical model describing the dynamic formation of fault damage asymmetry</p> <p>This document includes the after-analysis data, where, the variable "Log2by3M" for the relative magnitude of AE events in the catalog, "M" for the coordinates of sensors, "Mechanical" for the raw mechanical loading information before synchronization, "Notch" for the coordinate of the notch on the beam, "QuaLoc" for the source location and time. </p>
Mechanical data of rotary shear experiments for the manuscript: "Determination of parameters characteristic of dynamic weakening mechanisms during seismic faulting in cohesive rocks".
<p>Mechanical data of rotary shear experiments and temperature measurements</p> <p>Each experiment is presented in a file with the experiment name (mechanical data of rotary shear experiment) and a file with the experiment name and _Temp (temperature measurement with the optical fiber).</p> <p>Mechanical data are presented in a tab-delimited file with calibrated measurements of:</p> <ul> <li>Time (milliseconds)</li> <li>Normal stress: Normal (MPa) </li> <li>Fault displacement: Slip (mm)</li> <li>Fault velocity: Velocity (mm/s)</li> <li>Shear stress: Shearstress (MPa)</li> <li>Axial shortening: Shortening (mm).</li> </ul>
Hydro-mechanical simulation of CO2 Injection into a faulted aquifer
<h2>Summary</h2> <p>This dataset contains the results of geomechanical simulations conducted on a faulted aquifer under conditions of CO2 injection. The primary focus of the simulations is the pressure evolution within the rock matrix and along the fault, as well as the associated changes in the mechanical state, including rock deformation and fault slip. Additionally, the simulations explore the sensitivity of fault stability under varying orientations of far-field stress.</p> <p>The dataset includes raw data in VTK format, as well as an illustrative Jupyter notebook that provides a comprehensive explanation of the problem's geometry, boundary and initial conditions, and an interpretation of the observed physical phenomena. The Jupyter notebook is designed to be run both online and locally.</p> <p>These simulations were performed using an open-source FEM-based geomechanical simulator. Detailed instructions for running the notebook, along with a link to the geomechanical simulator, are provided in the description below.</p> <h2>Contributions</h2> <ul> <li>Emil Gallyamov did contribute to the production of the dataset and its visualisation.</li> <li>Ismaël Gomes did contribute to the development of the visualisation interface through Jupyter Notebooks and Streamlit.</li> <li>Guillaume Anciaux did contribute to the development of the visualisation interface and data curation.</li> </ul> <h2>Data collection: period and details</h2> <ul> <li>From 20 April, 2024 to 30 August, 2024, the .pvt and .npy files were generated, curated, and visualisation routines were developed.</li> </ul> <h2>Funding sources</h2> <ul> <li>ENAC Interdisciplinary Cluster Grant project <a href="https://www.epfl.ch/schools/enac/osgeocgs/">OSGEOCGS</a>.</li> </ul> <h2>Notebook demonstration</h2> <h3>Online</h3> <p>An interactive notebook showcasing visualisations of the dataset is available on <a href="https://renkulab.io/projects/phamba/geology-data-visualization/sessions/new?autostart=1">RenkuLab</a>.</p> <h3>Running locally</h3> <p>Alternatively, you can launch the notebook on your computer. Download the dataset, install dependencies, and launch <em>Jupyter notebook</em>:</p> <p><code>pip install -r requirements_freeze.txt</code></p> <p><code>jupyter notebook</code></p> <p>Then, open <code>notebooks/DataVisualisation.ipynb</code>.</p> <h2>Reproducing the dataset</h2> <p>To recreate the results found in this dataset, install the <a href="https://archive.softwareheritage.org/browse/origin/directory/?origin_url=https://gitlab.com/emil.gallyamov/akantu-geomechanical-solver">solver</a> and go through the example at <a href="https://archive.softwareheritage.org/browse/origin/directory/?origin_url=https://gitlab.com/emil.gallyamov/akantu-geomechanical-solver&path=examples/injection_fault"><code>examples/injection_fault</code></a>.</p> <h2>Data structure and information</h2> <p>The repository has the following structure:</p> <ul> <li>data: simulation results <ul> <li>reservoir_vs_time: bulk, solid, cohesive and fault fields for the duration of the simulation <ul> <li>paraview: vtk files</li> <li>*.npy: numpy arrays to store numerical data at specified locations</li> </ul> </li> <li>fault_vs_angle: only cohesive fields for 180 degrees of rotation <ul> <li>cohesive_0*.vtu: vtu files containing absolute values of the fields</li> <li>cohesive_init_0*.vtu: all the fields in these files are frozen to the initial (at rest) system state</li> <li>cohesive_parsed.pvd</li> <li>cohesive_init_parsed.pvd: postprocessing of Ismaël is substracting one set of data from the other one and plots the difference - increase of slip</li> </ul> </li> </ul> </li> <li>notebooks: data visualisation through Jupyter Notebooks <ul> <li>images: images used for illustration in notebooks (e.g. schema of stress rotation, model geometry, etc.) <ul> <li>stress_rotation: contains images with scheme of rotation for angles from 0 to 180</li> </ul> </li> <li>DataVisualisation.ipynb: main notebook with visualized DataVisualisation</li> </ul> </li> <li>library: all the scripts needed to visualize DataVisualisation</li> </ul>
Supplementary Dataset for "A new mechanical perspective on a shallow megathrust near-trench slip from the high- resolution fault model of the 2011 Tohoku-Oki earthquake"
<p>This dataset contains the results obtained by the analysis in this study, such as the digital data of the slip distribution and stress drop estimated by Kubota et al.(2022)</p>
Data Set: The influence of roughness on experimental fault mechanical behaviour and associated microseismicity
<p>This is the data set used to create the figures for the submitted manuscript, The influence of roughness on experimental fault mechanical behaviour and associated microseismicity. Submitted July 2022 to the Journal of Geophysical Research: Solid Earth. Article DOI: 10.1029/2022JB025113</p>
Frictional Properties of Fault Rocks and Creep Mechanism for the Laohushan Segment of the Haiyuan Fault, Northeastern Tibet
<p>All raw data of XRD analyses of fault rocks, particle size analyses of fault gouges, and mechanical data of fault gouge at different temperature are related to this paper.</p>
Table for Paper: Late Pleistocene-Holocene Paleoseismology of Mingle-Damaying Fault and the Indication for the Crustal Shortening Mechanism of East Qilian Shan, Northeast Tibetan Plateau
<p>The material for sampling is charred material and they are analyzed in Beta Analytic Inc., USA and AMS <sup>14</sup>C dating laboratory of Peking University. Both of the laboratories provide conventional age, as well as calibrated age using INTCAL13 (Reimer et al., 2013).</p>
Data for paper: Late Pleistocene-Holocene Paleoseismology of Mingle-Damaying Fault and the Indication for the Crustal Shortening Mechanism of East Qilian Shan, Northeast Tibetan Plateau
<p>All of the data are in format of JPG</p>
Mechanical data from rotary shear experiments for the manuscript: Mechanical behavior of fluid-lubricated faults
<p>Mechanical data from rotary shear experiments. <strong>sNNNN</strong> has no file extension but it is a tab-delimited file including all the original raw measurements. Raw measurements are acquired via a National Instruments Labview interface communicating with a real-time acquisition system. Use the ReadMe.txt file for the explanation on the conversion of the raw data.</p>
Data Set for Sandanbata & Saito (submitted to JGR: Solid Earth) entitled "Quantifying magma overpressure beneath a submarine caldera: A mechanical modeling approach to tsunamigenic trapdoor faulting near Kita-Ioto Island, Japan"
<p><strong>Descriptions</strong></p> <p>This dataset contains supplementary materials for the manuscript submitted to Journal of Geophysical Research: Solid Earth; the preprint has been uploaded to ESS Open Archive:</p> <ul> <li>Osamu Sandanbata, and Tatsuhiko Saito, Quantifying magma overpressure beneath a submarine caldera:<br> A mechanical modeling approach to tsunamigenic trapdoor faulting near Kita-Ioto Island, Japan.</li> </ul> <p>We present a mechanical source model for the 2008 Kita-Ioto caldera earthquake. </p>
Mechanical data of rotary shear experiments, temperature measurements, and temperature numerical models for the manuscript: "Mechanical energy dissipation during seismic dynamic weakening in calcite-bearing faults"
<p>All data included in this data repository is ancillary to the manuscript "Energy dissipation during dynamic weakening in calcite-bearing fault rocks", submitted to Journal of Geophysical Research: Solid Earth. </p><p>The data consists in time series of high velocity friction experiments run with SHIVA (INGV, Rome), time series acquired from a two-color pyrometer (UC3M), the synchronization of the two, and numerical models. The data format is .mat, proprietary to Matlab, but they can be easily accessed with Python (see <a href="https://docs.scipy.org/doc/scipy/reference/generated/scipy.io.loadmat.html">link</a>). Each .mat contains vector of the measured variables when opened from Matlab, or dictionaries when opened using the scipy.loadmat() function. </p><p>SHIVA and PYRO red data (calibrated data), fin data (synchronized data), and shivaRED vect data (numerical model data) are included in this data repository in separate folders. Numerical models are grouped in subfolder by type of model (the relation fin data to model is 1:n). We included the scripts to convert SHIVA raw data into SHIVA red data (<a href="https://github.com/aretu/shivaUNIX">link to shivaUNIX</a>), SHIVA and PYRO red data into fin data (/scripts/syncing2021.m), to obtain numerical models from fin data (<a href="https://github.com/aretu/shivaRED">link to shivaRED</a>), and to plot data (/scripts/making plots.ipynb).</p>
Laboratory evidence supporting a mechanical model describing the dynamic formation of fault damage asymmetry [DATA]
<p>Data and metadata for the publication "Laboratory evidence supporting a mechanical model describing the dynamic formation of fault damage asymmetry", published in Geophysical Research Letters.</p>
Growth - related formation mechanism of I3 - type basal stacking fault in epitaxially grown hexagonal Ge - 2H
<p>The hexagonal-2H crystal phase of Ge recently emerged as a promising direct bandgap semiconductor in the mid-infrared range providing new prospects of additional optoelectronic functionalities of group-IV semiconductors (Ge and SiGe). The controlled synthesis of such hexagonal(2H)Gephaseis a challenge that can be overcome by usingwurtziteGaAsnanowires as a template. However, depending on growth conditions, unusual basal stacking faults (BSFs) of I3-type are formed in themetastable2H structure. The growth of such core/shell heterostructures has been observed in situ and in real-time by means of environmental transmission electron microscopy using chemical vapor deposition. The observations provide direct evidence of a step-flow growth of the Ge-2H epi layer and reveal the growth-related formation of I3-BSF during unstable growth. Their formation conditions are dynamically investigated. Through these in situ observations we can propose a scenario for the nucleation of I3-type BSFs that is likely valid for any metastable hexagonal 2H or wurtzite structures grown on m-plane substrates. Conditions are identified to avoid their formation for the perfect crystalline synthesis of SiGe-2H.</p> <p>This dataset contains all the original scanning and transmission electron microscopy images and videos, and the atomic models that our results and understanding of the I3 defects are based on.</p>
Experimental Data Collection and Modeling for Nominal and Fault Conditions on Electro-Mechanical Actuators
Being relatively new to the field, electromechanical actuators in aerospace applications lack the knowledge base compared to ones accumulated for the other actuator types, especially when it comes to fault detection and characterization. Lack of health monitoring data from fielded systems and prohibitive costs of carrying out real flight tests push for the need of building system models and designing affordable but realistic experimental setups. This paper presents our approach to accomplish a comprehensive test environment equipped with fault injection and data collection capabilities. Efforts also include development of multiple models for EMA operations, both in nominal and fault conditions that can be used along with measurement data to generate effective diagnostic and prognostic estimates. A detailed description has been provided about how various failure modes are inserted in the test environment and corresponding data is collected to verify the physics based models under these failure modes that have been developed in parallel. A design of experiment study has been included to outline the details of experimental data collection. Furthermore, some ideas about how experimental results can be extended to real flight environments through actual flight tests and using real flight data have been presented. Finally, the roadmap leading from this effort towards developing successful prognostic algorithms for electromechanical actuators is discussed.*
Differential crustal modification mechanism across the central-southern segment of Tanlu fault zone, eastern China
<div> <p>The folder contains: RFs, Discontinuities.txt and Velocity_model.</p> <p>RFs:<br>Receiver function waveforms.</p> <p>Discontinuities.txt:<br>This text file contains data related to discontinuities, with the meaning of each column listed in the first row of the file.</p> <p>Velocity_model:<br>This folder contains text files named station names, each representing the inverted velocity model for the corresponding station. The first line of each text file indicates the latitude and longitude of the station. From the second line to the last line, the velocity model is represented as follows: the first column indicates depth, the second column represents Vs (shear wave velocity), the third column indicates the error of Vs, the fourth column represents Vp, and the fifth column indicates the ratio Vp/Vs.</p> <p> </p> </div>
Basic data for manuscript "Identification Markers, Structural Characteristics and Evolution Mechanism of Strike-Slip Faults in the Southeastern Sichuan Basin, Southwestern China"
<p>The basic data used for the research involved in the manuscript "Identification Markers, Structural Characteristics and Evolution Mechanism of Strike-Slip Faults in the Southeastern Sichuan Basin, Southwestern China" includes the following figures: the position of the key research area in map view (numbered 00). Coherence attribute slices (numbered 01 to 19) of important seismic reflection interfaces for research obtained from 3D seismic data volume of each key research area. Horizontal time slices (numbered 20 to 24) obtained at equal intervals (20ms or 50ms) from 3D seismic data volume in each key research area. Seismic sections obtained from 3D seismic data volume of each key research area and seismic sections perpendicular to strike-slip fault for detailed analysis are also obtained at equal intervals (numbered 25 to 35). Photographs obtained from field observations were also provided (numbered 36 to 39). See the document "Details of basic data" for details of the above pictures.</p>
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