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206 results for “subduction”
Frictional Properties and Healing Behavior of Tectonic Mélanges: Implications for the Evolution of Subduction Fault Zones
<p>Here, we report data from velocity-step experiments using rocks collected from ancient subduction fault zones, the Lower Mugi and Makimine mélanges of the Cretaceous Shimanto belt. The two mélanges preserve paleotemperature records corresponding to the updip and downdip limits of the seismogenic zone and deformation recording a lower versus higher degree of pressure solution. The compostions of the mélanges analyzed with X-ray diffraction (XRD) are also included in the datasets. Our data show that the Lower Mugi mélange sample exhibits velocity-weakening to velocity-neutral behavior under low normal stress, and the Makimine mélange sample shows velocity-strengthening behavior under high normal stress. This is consistent with the slip behavior observed at the depths they have been subducted to along the plate interface. We also perform a series of slide-hold-slide experiments under different hydrothermal conditions using the Lower Mugi mélange sample to evaluate the role of pressure solution in fault healing and its dependency on temperature. The results show that healing rates increase in tests operated at higher temperatures, which suggests the importance of pressure solution healing along plate interfaces.</p>
Sn velocity model and original catalogue data for essay "Uppermost mantle structure of the Japan subduction zone from Sn tomography"
<p>Sn velocity model and original catalogue data for essay “Uppermost mantle structure of the Japan subduction zone from Sn tomography”</p> <p> </p>
The Impact of the Three-Dimensional Structure of a Subduction Zone on Time-dependent Crustal Deformation Measured by HR-GNSS
<p>Companion data set to the paper "<strong>The Impact of the </strong><strong>Three-Dimensional Structure of a Subduction Zone on Time-dependent Crustal Deformation Measured by HR-GNSS.</strong>" The 'GNSS_Stations' folder contains the GNSS stations used for 2011 <strong>M</strong>7.9 Ibaraki, 2011 <strong>M</strong>7.4 Iwate, 2011A <strong>M</strong>7.3 Miyagi and 2003 <strong>M</strong>8.3 Tokachi 2003 earthquakes. The 'Mesh' folder contains the fault geometry mesh files for the Japan Trench, including the GMSH files. The '3D_velocity_model' folder contains the 3D velocity model for the combined West and East domains of the 3D Japan Integrated Velocity Structure Model in a rfile format and the corresponding ifile format. The 'Ruptures' folder contains the projected rupture models for each earthquake on the Japan Trench mesh and the corresponding 100 realizations of the mean rupture models generated using FakeQuakes. If you use these data, please cite the associated publication:</p> <p>Fadugba, ­O. I., Sahakian, V. J., Diego Melgar, D., Rodgers, A. & Shimony, R. (2023). The Impact of the Three-Dimensional Structure of a Subduction Zone on Time-dependent Crustal Deformation Measured by HR-GNSS.</p>
Supplementary material: Accuracy of finite fault slip estimates in subduction zone regions with topographic Green's functions and seafloor geodesy
<p># Code attached to the manuscript entitled "Accuracy of finite fault slip estimates in subduction zone regions with topographic Green's functions and seafloor geodesy"</p> <p>These python scripts are for producing Figure 1 (trench-perpendicular topographic profile for regions where some megathrust earthquakes occurred) and the average topographic profile that is used in the paper.</p> <p> </p>
Data & scripts - The effect of temperature-dependent material properties on simple thermal models of subduction zones
<p>Data and scripts used in Van Zelst et al. (2023, Solid Earth): 'The effect of temperature-dependent material properties on simple thermal models of subduction zones'. Includes the data and figures for the benchmark of Van Keken et al. (2008) plus the results from our code xFieldstone; processing and visualisation scripts; raw and final figures; and all results for all model runs used in the publication (as listed in Table 1 in the paper). </p>
A weak subducting slab at intermediate depths below northeast Japan
<p>Knowledge of the state of stress in subducting slabs is essential for understanding their mechanical behavior and the physical processes that generate earthquakes. Here we develop a novel framework that uses a high-resolution focal mechanism catalog to determine, for the first time, the full deviatoric stress tensor within the subducting slab at intermediate depths. We show that by combining the static stress calculated from coseismic slip distributions with the stress orientations before and after the mainshock, that deviatoric stress within the slab at intermediate depths must be very low ( ∼ 1 MPa). These results preclude earthquake source mechanisms that require large background driving stresses, favoring a mechanically weak subducting slab, thus providing quantitative constraints on the physical processes that generate intermediate-depth earthquakes.</p>
The origin of granitoids in Southwest Japan: Implications for the transition from Pacific to Philippine Sea plate subduction
<p>Data for the research entitled <strong>"The origin of granitoids in Southwest Japan: Implications for the transition from Pacific to Philippine Sea plate subduction" </strong>by<strong> </strong>Dao et al., submitted to JP.</p> <p><strong>Table S1:</strong> Geochemical data of plutonic rocks in Southwest Japan: (1) Ryoke belt; (2) Sanyo belt; (3) Sanin belt.</p> <p><strong>Table S2:</strong> Petrographic observation: (1) Modal abundances; (2) Mineral assemblages.</p> <p><strong>Table S3:</strong> Zircon U-Pb ages (Ma) of plutonic rocks in SW Japan from this study.</p> <p><strong>Table S4:</strong> Compilation of age data for Cretaceous-Paleogene igneous rocks in SW Japan.</p> <p><strong>Table S5:</strong> Geochemical data of plutonic rocks in SW Japan compiled by Haraguchi et al. (2018).</p> <p><strong>Table S6:</strong> Compilation of Sr-Nd isotope data of ~110 Ma to ~20 Ma plutonic rocks in SW Japan.</p> <p><strong>Table S7:</strong> CIPW normative compositions of SW-Japan granitoids from this study.</p> <p><strong>Table S8:</strong> End-member components used to estimate sediment contributions.</p> <p><strong>Table S9: </strong>Results of sediment contribution estimations.</p>
Detectability of very low frequency earthquakes in Nankai subduction zone
<p><strong>How to cite this data</strong></p> <ul> <li>data DOI of this repository</li> <li>method and conception<br>Shunsuke Takemura, Satoru Baba, Suguru Yabe, Yusuke Yamashita, Katsuhiko Shiomi, Takanori Matsuzawa, Detectability analysis of very low frequency earthquakes: methods and application in Nankai using F-net and DONET broad-band seismometers, <em>Geophysical Journal International</em>, Volume 237, Issue 1, April 2024, Pages 49–63, <a href="https://doi.org/10.1093/gji/ggae033">https://doi.org/10.1093/gji/ggae033</a></li> </ul> <p><strong>source_meca.dat</strong></p> <p>Assumed focal mechanisms. Longitude, Latitude, depth, strike, dip, and rake are listed. Focal mechanisms at each source grid were assumed to be low-angle thrust faulting mechanisms from the plate geometry of Koketsu et al. (2012) and the convergence direction of NUVEL-1A (DeMets et al. 2010).</p> <p><strong>VLFEdetectability_Fnet.dat</strong></p> <p>The detectable limits of very low frequency earthquakes (VLFEs) in Nankai using F-net only. Longitude, Latitude, depth, and detectable limit (the lowest moment rate of detectable VLFEs) at each source grid are listed. The file with "Z" is the detectability of VLFEs using only vertical components. </p> <p><strong>VLFEdetectability_FnetDONET.dat</strong></p> <p>The detectable limits of VLFEs in Nankai using F-net and DONET. Longitude, Latitude, depth, and detectable limit (the lowest moment rate of detectable VLFEs) at each source grid are listed. The file with "Z" is the detectability of VLFEs using only vertical components. </p>
Data from: India-Eurasia convergence speed-up by passive-margin sediment subduction
Open the record for dataset details and reuse information.
A weak subducting slab at intermediate depths below northeast Japan
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Dataset for subduction initiation during collision-induced subduction transference
<p>Numerical results for 'Subduction initiation during collision-induced subduction transference: Numerical modeling and implications for the Tethyan evolution'.</p>
Near-field tsunami forecasting along the Cascadia subduction zone using rapid GNSS source models
<p>Data pertaining to the submitted work <em>Near-field tsunami forecasting along the Cascadia subduction zone using rapid GNSS source model</em> (2020) by Williamson et al. Specifically, the dataset includes (1) synthetic, generated GNSS waveforms for 1300 Cascadia rupture scenarios and (2) model outputs for every tested rapid earthquake characterization.</p>
Flat subduction versus big mantle wedge: contrasting modes for deep hydration and overriding craton modification - Dataset
<p>This is the dataset for the paper "Flat subduction versus big mantle wedge: contrasting modes for deep hydration and overriding craton modification" that has been submitted to "Journal of Geophysical Research: Solid Earth" for publication.</p>
Experimental data for "Cohesional slip on a plate subduction boundary during a large earthquake"
<p>This deposit contains raw data used for the study reported in the paper "Cohesional slip on a plate subduction boundary during a large earthquake".</p>
Calcium stable isotopes of Tonga and Mariana arc lavas and implications for slab fluid-mediated carbonate transfer in subduction zones
<p>The Table 1 shows Ca isotopes and selected major and trace element compositions of the Tonga rear arc and Mariana arc lavas.</p> <p>Supporting imformation includ Figure S1 and Table S1</p> <p>Figure S1 shows the δ<sup>44/42</sup>Ca‰ versus δ<sup>43/42</sup>Ca‰ in all samples and reference materials measured by Nu Plasma 1700 MC-ICP-MS in GPMR.</p> <p>Table S1 lists the major and trace element contents of NW Rota-1 and Esmeralda Bank samples from Mariana arc. Major elements are tested on board and trace elements are measured by ICP-MS in GPMR.</p>
Field-based evidence for intra-slab high-permeability channel formation at eclogite-facies conditions during subduction
<p>Bulk rock analysis of metamorphic rock samples (major and trace element)</p>
Thermal regime and petrologic metamorphism in Alaska: Implications for subduction interface and wedge earthquakes
<p>Characterized by repeated large earthquakes, slow slips, and tectonic tremors with their simultaneous release of large amounts of energy, the unstable subduction interface beneath Alaska presents a chance to understand the composite dynamic transition from deep to shallow subduction channel where these enigmatic fault slips and seismic events occur. The complex subducted slab morphology associated with the frequent occurrence of various types of faulting behaviors in Alaska is poorly understood. Our result shows that the subduction of the Pacific plate and the subsequent release of large amounts of fluid likely contribute to the repeated fast and slow earthquakes there, as evidenced by the petrological metamorphic transition in the incoming plate. The offshore Alaska seismogenic zone, as well as the slow earthquakes identified near the Upper Cook Inlet, compare well with the distribution of slab dehydration slivers, including large destructive earthquakes that have occurred in Alaska. The fluid upwelling from dewatered oceanic crust and the continental wedge serpentinizing is probably related to various transportation pathways controlled by dip angle and upwell in the predominant direction following the subduction channel or veins in the overriding lithosphere.</p>
Dataset for induced subduction through the inversion of spreading ridges
<p>Numerical results for "Dynamic evolution of induced subduction through the inversion of spreading ridges".</p>
Subducted lithospheric boundary tomographically imaged beneath arc-continent collision in Eastern Indonesia
<p>We use travel-times from a temporary seismic deployment of 30 broadband seismometers and a national catalog of arrival times to construct a finite frequency teleseismic P-wave tomographic model of the upper mantle beneath astern Indonesia, where subduction of the Indo-Australian plate beneath the Banda Arc transitions to arc-continent collision. The change in tectonics is due to a change from oceanic to continental lithosphere in the lower plate as inferred from geologic mapping and geophysical, geochemical, and geodetic measurements. At this inferred transition, we seismically image the subducted continent-ocean boundary at upper mantle depths that links volcanism on Flores to amagmatic orogenesis on Timor. Our tomographic images reveal a relatively high velocity feature within the upper mantle, which we interpret as the subducted Indo-Australian slab. The slab appears continuous yet deformed as a result of the change in buoyancy due to the composition of the incoming continental lithosphere. Accordingly, there is a difference in dip angle between the oceanic and continental sections of the slab albeit not a gap or discontinuity. We suggest the slab has deformed without tearing to accommodate structural and kinematic changes across the continent-ocean boundary as the two sections of the slab diverge. These results suggest that deformation in tectonic collisions can be localized along a continent-ocean boundary, even at depth. We propose that future slab tearing may develop where we observe slab deformation in our study region and that a similar process may take place in collisions generally.</p>
Data for: Electrical Conductivity of Superionic Hydrous SiO2 and the Origin of Lower-mantle High Conductivity Anomalies Beneath Subduction Zones
<p><strong>Dataset S1.</strong> Experimental conditions and the measured resistance and conductivity of hydrous Al-bearing SiO2. </p>
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