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13 results for “Nankai Trough”
Data from 1564 earthquake/tsunami scenario simulations targeting the Nankai Trough subduction zone
<p><strong>Summary:</strong></p> <ul> <li>Data from 1564 earthquake/tsunami scenario simulations targeting the Nankai Trough subduction zone</li> <li>Tsunami simulation solver: TUNAMI-N2</li> <li>Fault rupture model: Okada model (Okada, 1985)</li> <li>Each scenario data comprises 247 ASCII files storing the simulated wave sequences at synthetic gauges.</li> <li>Every single scenario is tagged as "JNan_X.X_YYY", where X.X indicates the magnitude and YYY is a serial number.</li> <li>Some synthetic gauges are in identical locations to actual ocean gauges (e.g., DONET2, NOWPHAS) near Shikoku, Japan.</li> </ul> <p><strong>Details of each file:</strong></p> <ul> <li><strong>data.tar.gz:</strong> A series of wave sequences (6-hour wave historical data, recorded every 5 seconds) at the 247 virtual gauges. Note that 52 GB of additional storage would be required to fully unzip this archive file with the following command. <pre><code>tar xzvf data.tar.gz</code></pre> <p>The unzipped directory contains all scenario data as follows:</p> <pre><code>data ├── JNan_7.6_001 ├── JNan_7.6_002 ├── JNan_7.6_003 ├── ├── ├── JNan_8.8_326 ├── JNan_8.8_327 └── JNan_8.8_328</code></pre> <p>Each directory contains 247 files named 'pntX_YY.asc'.</p> <pre><code>JNan_X.X_YYY ├── pnt1_01.asc ├── pnt1_02.asc ├── pnt1_03.asc ├── ├── ├── pnt5_46.asc ├── pnt5_47.asc └── pnt5_48.asc</code></pre> <p>In each ASCII file, the time (minute) elapsed from the fault rupture is aligned in the left column, and the wave displacements (meter) from the original sea level are in the right column.</p> </li> <li> <p><strong>quake_params.csv:</strong> The parameter used to generate 1564 earthquake scenarios caused by the rupture of rectangular fault, by means of the Okada model (Okada 1985)</p> </li> <li> <p><strong>synthetic_gauges.csv:</strong> The locations of the 247 synthetic gauges</p> </li> </ul>
3D CMT catalogue of moderate size offshore earthquakes along the Nankai Trough
<p>3D CMT inversion solutions of moderate-size earthquakes along the Nankai Trough, <strong>version 3.1. </strong> </p> <ul> <li>Analyzed periods: <strong>January 2003 to December 2020</strong> <ul> <li>The catalog version 3, containing CMT solutions from January 2003 to April 2020.</li> <li>The catalog version 2.2, which is containing CMT solutions from April 2004 to August 2019, has been published in GJI (Takemura, Okuwaki et al. 2020 <a href="https://doi.org/10.1093/gji/ggaa238">doi:10.1093/gji/ggaa238</a>).</li> </ul> </li> <li>The method is described in Takemura, Okuwaki, et al., 2020, GJI, <a href="https://doi.org/10.1093/gji/ggaa238">doi:10.1093/gji/ggaa238</a> <a href="https://doi.org/10.31223/osf.io/nbd79">the submitted preprint</a>. </li> </ul> <p>If you use this version, you should cite the appropriate DOI and Takemura, Okuwaki, et al. 2020 GJI.</p> <p><strong>Included files</strong></p> <ul> <li>YYYYMMDDHHMM_25-100s__CMT.dat<br> CMT solutions at all selected source grids for an earthquake that occurred at HH:MM on DDth MM YYYY (JST). Latitude, longitude, depth, VR [%], M<sub>rr</sub>, M<sub>tt</sub>, M<sub>ff</sub>, M<sub>rt</sub>, M<sub>rf</sub>, M<sub>tf</sub>, exponent (dyne-cm), Mo [Nm], strike1, dip1, rake1, strike2, dip2, rake2, Mw, index of source grid (internal parameter), and centroid time are listed. </li> <li>YYYYMMDDHHMM_25-100s__CMTparam.dat<br> Input directory (internal parameter), Green's function directory (internal parameter), the number of source grids, the number of used stations, station names used in CMT inversion, frequency range, initial epicenter and distance range are listed.</li> <li>3DCMTcatalog_v3.csv<br> CSV format file of the 3D CMT catalog for earthquakes with Mw of 4.3-6.5</li> <li>catalog3DCMT_Takemura2019_Mw7.2_7.5SEKii.csv<br> CSV format file of the 3D CMT catalog for the Mw 7.2 and 7.5 southeast off the Kii Peninsula earthquake occurred on 19:07 and 23:57 5th September 2004 (JST), respectively.</li> </ul>
Moment rate functios of shallow very low frequency earthquakes off the Cape Muroto and Kii Channel, along the Nankai Trough, Japan
<p>Moment rate functions of shallow very low frequency earthquakes (VLFEs) that occurred off the Cape Muroto and Kii Channel. A similar catalog but for southeast off the Kii Penisula can be downloaded from <a href="https://doi.org/10.5281/zenodo.5211090">https://doi.org/10.5281/zenodo.5211090 </a></p> <p>This data set is the supplement of "Takemura, S., Baba, S., Yabe, S., Emoto, K., Shiomi, K., & Matsuzawa, T. (2022). Source characteristics and along-strike variations of shallow very low frequency earthquake swarms on the Nankai Trough shallow plate boundary. <em>Geophysical Research Letters</em>, 49, e2022GL097979. <a href="https://doi.org/10.1029/2022GL097979">https://doi.org/10.1029/2022GL097979</a>"</p> <p><strong>Included files</strong></p> <ul> <li>YYYY-MM-DDThhmmssparam.stf<br> Parameter file for the Monte-Carlo-based simulated annealing estimation for a shallow VLFE occurred at hh:mm:ss on DDth MM YYYY (JST). Detection time, correlation coefficient, longitude, latitude, ratio (internal parameter), template index (internal parameter), assumed strike angle, dip angle, rake angle, source grid index (internal parameter), the number of the used stations, station list are included.</li> <li>YYYY-MM-DDThhmmss_STF.dat<br> Moment rate function for a shallow VLFE occurred at hh:mm:ss on DDth MM YYYY (JST). The optimal and original simulated annealing estimations are listed in the 2nd and 3rd columns, respectively. The time from the origin is represented in the 1st column</li> <li>VLFE_catalog.csv<br> CSV format file of Shallow VLFE catalog from Apr. 2004 to Mar. 2021. Origin time (JST), origin time (UTC), longitude (ºE), latitude (ºN), seismic moment (Nm), duration (s), VR (%), and Mw are listed.</li> <li>Data Set S1<br> CSV format file of shallow VLFE swarm catalog. Origin time (JST), epicenter locations, seismic moments, durations, moment magnitudes, VRs, and swarm indexes of each shallow VLFE. The “-” in the swarm index column means that this shallow VLFE does not belong to shallow VLFE swarms.</li> </ul> <p><strong>Citation</strong></p> <ul> <li>Takemura, S., Baba, S., Yabe, S., Emoto, K., Shiomi, K., & Matsuzawa, T. (2022). Source characteristics and along-strike variations of shallow very low frequency earthquake swarms on the Nankai Trough shallow plate boundary. <em>Geophysical Research Letters</em>, 49, e2022GL097979. <a href="https://doi.org/10.1029/2022GL097979">https://doi.org/10.1029/2022GL097979</a></li> <li>This data doi</li> </ul>
List of VLFEs obtained in the paper "Influence of a subducted oceanic ridge on the distribution of shallow VLFEs in the Nankai Trough as revealed by moment tensor inversion and cluster analysis"
<p>List of VLFEs obtained in Toh et al., (2020, GRL).</p> <p>"Influence of a subducted oceanic ridge on the distribution of shallow VLFEs in the Nankai Trough as revealed by moment tensor inversion and cluster analysis" by Akiko Toh, Wan-Jou Chen, Nozomu Takeuchi, Douglas Dreger, Wu-Cheng Chi, and Satoshi Ide. </p> <p> </p>
Moment rate functios of shallow very low frequency earthquakes southeast off the Kii Peninsula, along the Nankai Trough, Japan
<p>Moment rate functions of shallow very low frequency earthquakes (VLFEs) that occurred southeast off the Kii Peninsula, along the Nankai Trough</p> <p>The method and related discussions were described in the <a href="https://doi.org/10.1029/2021JB023073">JGR paper</a>.</p> <p><strong>Included files</strong></p> <ul> <li>YYYY-MM-DDThhmmssparam.stf<br> Parameter file for the Monte-Carlo-based simulated annealing estimation for a shallow VLFE occurred at hh:mm:ss on DDth MM YYYY (JST). Detection time, correlation coefficient, longitude, latitude, ratio (internal parameter), template index (internal parameter), assumed strike angle, dip angle, rake angle, source grid index (internal parameter), the number of the used stations, station list are included.</li> <li>YYYY-MM-DDThhmmss_STF.dat<br> Moment rate function for a shallow VLFE occurred at hh:mm:ss on DDth MM YYYY (JST). The optimal and original simulated annealing estimations are listed in the 2nd and 3rd columns, respectively. The time from the origin is represented in the 1st column</li> <li>VLFE_catalog.csv<br> CSV format file of Shallow VLFE catalog from Apr. 2004 to Mar. 2021. Origin time (JST), origin time (UTC), longitude (ºE), latitude (ºN), seismic moment (Nm), duration (s), VR (%), and Mw are listed.</li> </ul> <p><strong>Citation</strong></p> <ul> <li>Takemura, S., Obara, K., Shiomi, K., Baba, S. (2021), Spatiotemporal variations of shallow very low frequency earthquake activity southeast off the Kii Peninsula, along the Nankai Trough, Japan <a href="https://doi.org/10.1029/2021JB023073">https://doi.org/10.1029/2021JB023073 </a></li> <li>This data doi</li> </ul> <p> </p>
Synthetic dataset of 2342 earthquake/tsunami scenarios targeting the Nankai trough subduction zone
<h2>Summary:</h2> <ul> <li>Data of 2342 hypothetical Nankai Trough events</li> <li>Tsunami propagation is simulated by the GeoClaw software (Clawpack Development Team, 2021).</li> <li>Earthquake realizations generated by the Mudpy software (Melgar, 2020).</li> <li>Data composition is as follows:<br><code>nankai_data</code><br><code>├── quakes</code><br><code>│ ├── dtopofiles</code><br><code>│ │ ├── nankai_xy_zzzzzz.dtt3</code><br><code>│ │ ├── ...</code><br><code>│ ├── png</code><br><code>│ │ ├── nankai_xy_zzzzzz_slip_dtopo.png</code><br><code>│ │ ├── ...</code><br><code>│ └── ruptures</code><br><code>│ ├── nankai_xy_zzzzzz.log</code><br><code>│ ├── nankai_xy_zzzzzz.rupt</code><br><code>│ ├── ...</code><br><code>├── waves</code><br><code>│ ├── nankai_xy_zzzzzz.csv </code><br><code>│ ├── ...</code><br><code>├── gauge_loc.csv</code><br><code>└── wave_seq.npy</code></li> </ul> <h2>Details of each file:</h2> <p>Unzipping `nankai_data.tar.gz` creates two directories and two file: `quakes/`, `waves/`, `gauge_loc.csv` and `wave_seq.npy`.<br>Note that 8 GB of additional storage is required. </p> <ul> <li> <h3>quakes/</h3> Earthquake data of 2342 scenarios. <ul> <li>quakes/dtopofiles/nankai_xy_zzzzzz.dtt3<br>Seafloor deformation of each scenario<br>Mw: x.y, ID: zzzzzz</li> <li>quakes/ruptures/<br>nankai_xy_zzzzzz.rupt stores the rupture for each scenario.<br>nankai_xy_zzzzzz.log has information about the rupture.</li> <li>quakes/png/nankai_xy_zzzzzz_slip_dtopo.png<br>The slip distribution and seafloor deformation due to fault rupture are visualized in PNG format.<br><br></li> </ul> </li> <li> <h3>waves/</h3> <p>2342 .csv files contain time series data of simulated tsunami wave heights<br>The left column has the time (minute) elapsed from the fault rupture<br>The following columns have the wave sequences recorded at each gauge<br>Each file has 2160 rows corresponding to the simulation time steps, 3 [hr] x 3600 [sec/hr] / 5[sec] = 2160.<br><br></p> </li> <li> <h3>gauge_loc_all.csv</h3> The locations of 62 synthetic gauges<br>Gauge IDs are in the left column named ID.<br>The gauge locations are in Longitude and Latitude columns.<br>Some of the synthetic gauges are set by referring to the locations of existing gauges, as shown in the Instruments column.<br><br></li> <li> <h3>wave_seq.npy</h3> Data matrix containing the wave sequences. <br> Loading this binary data by <br> numpy.load('wave_seq.npy') <br> gives a 2342 x 62 x 2160-shaped 3d array.</li> </ul> <p> </p>
Nankai Trough FakeQuakes geodetic and waveform data
<p>Supplementary data for the master thesis "A Study on Tsunami Damage Prediction Based on Pre-computed Scenarios<strong>" </strong>by Louise A. Hirao-Vermare, master's student at Tohoku University.<br> "nagahama_geodetic_data.tar.gz" gathers synthetic geodetic data, i.e., ground displacements, at several inland stations. "nagahama_wave_data.tar.gz" gathers synthetic wave elevations at several offshore gauges. <br> Not all data are used in the master thesis. <br> File formats are explained in READ_ME.txt. The location of the observation stations are provided in the .klm files.</p>
Simulation data for paper "Estimation of in-situ stresses and friction properties of rock masses based on natural fractures conductivity: a case study from C0002 well at Nankai Trough zone, offshore Shikoku Island, Japan"
<p>Supplementary files for Dubinya, Tikhotskiy paper entitled "Estimation of in-situ stresses and friction properties of rock masses based on natural fractures conductivity: a case study from C0002 well at Nankai Trough zone, offshore Shikoku Island, Japan" prepared for submission to Journal of Geophysical Research: Solid Earth.</p> <p> </p> <p>File "Initial data on fractures.csv" contains initial data on conductivity of natural fractures, their deoths and spatial orientations</p> <p>Files "Unit N, (un)limited friction" contain results of Monte-Carlo simulations completed based on data from fractures from N-th interval. Friction coefficient is varied either between 0 and 1 (unlimited friction), or 0.4 and 0.6 (limited friction).</p>
Decadal seafloor geodesy constrains frictionally locked areas along the Nankai Trough
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Migrating shallow slow slip on the Nankai trough megathrust, captured by borehole observatories
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Middle Holocene relative sea-level changes and vertical tectonic crustal movements on Shikoku Island near the Nankai Trough, Japan
<p>The Philippine Sea plate subducts beneath the Eurasia plate at the Nankai Trough, northwestern Pacific, causing crustal deformation, mega-thrust earthquakes, and tsunami events. Shikoku Island, 150 km northwest of the trough, experiences both coseismic and interseismic deformation. Coastal sediments potentially record vertical crustal movements as relative sea level (RSL) changes. We studied sedimentary facies and microfossil ostracodes in core SKM from southwestern Shikoku Island for evidence of middle Holocene tsunami events and deformation. The core sediments included nine event layers corresponding to storm or tsunami events. Using modern analog techniques, we estimated RSLs from the ostracode assemblages of core SKM and 13 other cores from Shikoku Island and the surrounding region. Then, we subtracted RSL changes due to glacio-hydro isostatic adjustment from the estimated RSLs to estimate vertical tectonic movement rates in these cores between 8.6 and 4.7 ka. The inferred RSL changes suggest that the Sukumo site has experienced both uplift and subsidence since 8.6 ka. Before 6.6 ka, rates of the tectonic crustal movement were higher than the modern-day rate, and its spatial distribution also differed. After 6.6 ka, the tectonic crustal movement showed a similar spatial pattern and occurred at rates close to the modern-day interseismic rate. The spatial pattern and rates of tectonic crustal movement could be caused by changes in rupture areas between Eurasia and the Philippine Sea plates beneath Shikoku Island and in stress conditions of the asthenosphere. Some of the vertical displacements can be explained by the movements of local active faults.</p>
Dataset for Thermal Properties of Pressure Core Samples Recovered from Nankai Trough Wells Before and After Methane Hydrate Dissociation
<p>This dataset is for the research article titled Thermal Properties of Pressure Core Samples Recovered from Nankai Trough Wells Before and After Methane Hydrate Dissociation published in Earth and Space Science.</p>
Middle Holocene relative sea-level changes and vertical tectonic crustal movements on Shikoku Island near the Nankai Trough, Japan
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