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11 results for “fault reactivation”
Evolution of fault reactivation potential in the greater Ruhr region (Germany). Results from analytical and numerical studies.
<p>This dataset presents results of analytical-probabilistic and numerical studies on the evolution of fault reactivation potential in the greater Ruhr region in western Germany. The dataset includes shapefile of major faults in the greater Ruhr region, with their specific dip angles, strike values, slip tendencies, dilation tendencies, fracture susceptibilities, and reduced-risk dilation tendencies. The results of long-term coupled thermo-hydro-mechanical simulations on two conceptual geothermal systems based on the two most prevailing fault architectures in the greater Ruhr region are also included in the dataset. The model results are saved with the COMSOL Multiphysics software format, where the simulations were carried out.</p> <p>Please check the README files for a detailed explanation of both datasets.</p> <p>_________________________________</p> <p>Update on 06/11/2024</p> <p>New version includes only one updated fully coupled thermo-hydro-mechanical model with a NW-SE-striking fault and a finer mesh.</p>
Frictional properties of feldspar-chlorite altered gouges and implications for fault reactivation in hydrothermal systems
<p>As particularly common minerals in granites, the presence of feldspar and altered feldspar-chlorite gouges at hydrothermal conditions have important implications in fault strength and reactivation. We present laboratory observations of frictional strength and stability of feldspar (K-feldspar and albite) and altered feldspar-chlorite gouges under conditions representative of deep geothermal reservoirs to evaluate the impact on fault stability. Velocity-stepping experiments are performed at a confining stress of 95 MPa, pore pressures of 35–90 MPa and temperatures of 120–400°C representative of in situ conditions for such reservoirs. Our experiment results show that the feldspar gouge is frictionally strong (<em>μ</em>~0.71) at all experimental temperatures (~120–400℃) but transitions from velocity-strengthening to velocity-weakening at <em>T</em>>120°C. Increasing the pore pressure increases the friction coefficient (~0.70-0.87) and the gouge remains velocity weakening, but this weakening decreases as pore pressures increase. The presence of alteration-sourced chlorite leads to a transition from velocity weakening to velocity strengthening in the mixed gouge at experimental temperatures and pore pressures. As a ubiquitous mineral in reservoir rocks, feldspar is shown to potentially contribute to unstable sliding over ranges in temperature and pressure typical in deep hydrothermal reservoirs. These findings emphasize that feldspar minerals may increase the potential for injection-induced seismicity on pre-existing faults if devoid of chlorite alteration.</p>
A Large Fault Partially Reactivated During Two Contiguous Seismic Sequences in Central Italy: The Role of Geometrical and Frictional Heterogeneities
<p>Moment tensor catalog for events with M > 3.0, that occurred between January 2009 and April 2021, in Campotosto area, Italy. Moments tensor were calculated by applying the Time Domain Moment Tensor technique, originally proposed by Dreger and Helmberger (1993) and Pasyanos et al. (1996) and successively implemented at INGV by Scognamiglio et al. (2009).</p> <p>The catalog includes:</p> <p>Location of events: time, depth, lat and lon</p> <p>The moment magnitude: Mw</p> <p>The double-couple value: DC</p> <p>The Variance Reduction value: VR</p> <p>The six moment tensor components: Mxx, Mxy, Mxz, Myy, Myz, Mzz</p> <p>The orientation of nodal planes: strike1, dip1, rake1, strike2, dip2, rake2</p> <p> </p>
A small CO2 leakage may reactivate a sub-seismic fault in a good-porosity clastic saline aquifer
<p>Seismograms.h5: HDF5 data set that contains the raw seismograms for all the 19 events (named ‘/event_X’ for the X-th event). Each seismogram contains 909 channels and 7000 samples for each trace, with a sampling frequency 1 kHz. The channel identification is stored in ‘/receiver_coordinates’, a 909 by 6 array, with the six columns having receiver line number, station number within the line, station name, UTM (zone 54H) easting (meters), UTM (zone 54H) northing (meters), and elevation (meters).</p>
Fault reactivation during fluid pressure oscillations: transition from stable to unstable slip
<p>This is the ReadMe file corresponding to the study entitled: "Fault reactivation during fluid pressure oscillations: transition from stable to unstable slip"</p> <p>By Noël C., Passelègue X.F, Giorgetti C., Violay M.</p> <p>This study has been published in the Journal of Geophysical Research: Solid Earth under Copyright on October 2019. <br> doi:</p> <p>This Read-Me file has been last edited on October 2019</p> <p>This readme file describes the data repository and supplementary files accompanying the above publication. <br> For any further queries please contact corentin.noel@epfl.ch</p>
The 2021-2022 Fukushima-Oki Earthquakes in Northeastern Japan: Dehydration Triggered Fault Reactivation Boosted by Slab Segmentation
<p>codes.rar: codes of double-difference seismic tomography</p> <p>catalog.dat: earthquake phase catalog used in the DD tomography</p> <p>station.dat: station coordinates of the seismic network </p> <p>MOD: grids in the initial Vp and Vp/Vs models</p> <p>Vp_model.dat: inverted 3-D Vp model</p> <p>Vs_model.dat: inverted 3-D Vs model</p> <p>VpVs_model.dat: inverted 3-D Vp/Vs model</p> <p>earthquake.reloc: relocations of the earthquakes</p>
Frictional properties of feldspar-chlorite altered gouges and implications for fault reactivation in hydrothermal systems
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TDMT solutions from catalog of "A Large Fault Partially Reactivated During Two Contiguous Seismic Sequences in Central Italy: The Role of Geometrical and Frictional Heterogeneities"
<p>Some new TDMT solutions from catalog at the link <a href="https://doi.org/10.5281/zenodo.10801577">https://doi.org/10.5281/zenodo.10801577</a>. The catalog contains events with M > 3.0, that occurred between January 2009 and April 2021, in Campotosto area, Italy. Moment tensor were calculated by applying the Time Domain Moment Tensor technique, originally proposed by Dreger and Helmberger (1993) and Pasyanos et al. (1996) and successively implemented at INGV by Scognamiglio et al. (2009).</p> <p>For every moment tensor the PDF file contains the event location, waveform fits, nodal planes, magnitude, double couple (DC) and compensated linear vector dipole (CLVD) values, variance reduction, six components of moment tensor and station coverage.</p>
The 2021 and 2022 Fukushima-Oki Earthquake Doublet: Reactivations of the Bending-Related Faults Inside the Japan Trench Subducting Slab
<p>The strong-motion (K-NET, KiK-net and S-net) waveforms and teleseismic <em>P</em> waves that were processed and used in the joint inversions of the 2021 <em>M</em><sub>w</sub>7.1 and 2022 <em>M</em><sub>w</sub> 7.3 Fukushima-Oki earthquakes are included in this repository.</p>
Temperature and fluid pressurization effects on frictional stability of shale faults reactivated by hydraulic fracturing in the Changning Block, Southwest China
<p class="Affiliation"><span>A shale fault reactivated during multi-stage hydraulic fracturing in the Changning block in the Sichuan Basin, southwest China accompanied a cluster of small earthquakes with the largest reaching<span> </span></span><em>M<sub>L</sub></em><span><span> </span>~0.8. We illuminate the underlying mechanisms of fault reactivation through measurements of frictional properties on simulated fault gouge under hydrothermal conditions. Velocity-stepping experiments were performed at a confining pressure of 60<span> </span></span><em>MPa</em><span>, temperatures from 30 to 300<span> </span></span><em>℃</em><span>, pore fluid pressures from 10 to 55<span> </span></span><em>MPa</em><span><span> </span>and shear velocities between 0.122 and 1.22<span> </span></span><em>μm/s</em><span>. Results show that the gouge is frictionally strong with coefficient of friction of 0.6-0.7 across all experimental conditions. At observed<span> </span></span><em>in-situ</em><span><span> </span>pore fluid pressure (30<span> </span></span><em>MPa</em><span>), the slip stability response is characterized by velocity strengthening at temperatures of 30-200<span> </span></span><em>℃</em><span><span> </span>and velocity weakening at temperatures of 250-300<span> </span></span><em>℃</em><span>. Increasing the pore fluid pressure can increase values of (</span><em>a – b</em><span>) at temperatures ≥ 200<span> </span></span><em>℃</em><span>, narrowing the temperature range where velocity weakening occurs. At the<span> </span></span><em>in-situ</em><span><span> </span>temperature (90</span><em>℃</em><span>), the simulated gouge shows only velocity strengthening behavior and aseismic slip at elevated pore fluid pressures, contrary to the observed seismicity. We postulate that the aseismic slip at elevated pore fluid pressures may trigger seismicity by activating adjacent earthquake-prone faults.</span></p>
Temperature and fluid pressurization effects on frictional stability of shale faults reactivated by hydraulic fracturing in the Changning Block, Southwest China
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