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781 results for “earthquakes”
Slab dehydration in Sumatra: Implications for fast and slow earthquakes and arc magmatism
<p>The catastrophic 2004 Sumatra-Andaman Mw9.1 earthquake associated with destructive tsunamis has characterized Sumatra as one of the most dangerous convergence zones. Nevertheless, the effects of the thermohydrous state on the strongly coupled megathrust of the incoming plate remain enigmatic. By using a 3-D thermomechanical model to compute the temperature variation and the complicated phase transition process of the water-bearing descending plate which generates unstable thrust slips, we find that Sumatran earthquakes at varying depths are likely under the control of the inter- or intraplate hydrothermal regime, which occurs in or close to the petrological metamorphism transition area. The slab dehydration of the water-rich mid-ocean-ridge basalts (MORB) and the ultramafic rocks in the oceanic lithosphere releases a large amount of fluid to the continental wedge and further facilitates arc magmatism. The fluids are prone to upwelling following the subduction channel along the plate interface and thus contribute to the clustering of earthquakes updip of the dehydration front beneath offshore Sumatra. Brittle failure and dehydration embrittlement at depth, along with the temperature differences caused by variant slab geometry, are conjectured to greatly influence the occurrence of fast and slow earthquakes in Sumatra.</p>
EXCEPTIONAL GROUND MOTION DURING THE SHALLOW MW 4.9 2019 LE TEIL EARTHQUAKE, FRANCE
<p>An unusually damaging Mw 4.9 earthquake occurred on November 11, 2019 in the south east of France within the lower Rhône river valley, an industrial region that hosts several operating nuclear power plants. The hypocentre of this event occurred at an exceptionally shallow depth of about 1 km. Here we use far-field seismological observations to demonstrate that the rupture properties are consistent with those commonly observed for large deeper earthquakes. In the absence of strong motion sensors in the fault vicinity, we perform numerical predictions of the ground acceleration on a virtual array of near-fault stations. These predictions are in agreement with independent quantitative estimations of ground acceleration from in-situ observations of displaced objects. Both numerical and in-situ analyses converge toward estimates of an exceptional level of ground acceleration in the fault vicinity, that exceeded gravity, and explains the unexpectedly significant damage.</p>
Data from: Elastogravity waves and dynamic ground motions in the Korean Peninsula generated by the 11 March 2011 Mw9.0 Tohoku-Oki megathrust earthquake
<p>The mass dislocations caused by large coseismic slips in megathrust earthquakes are large enough to produce elastogravity waves. Despite successful identification of elastogravity-wave development during megathrust earthquakes, the nature of ground motions and hazard potentials in regional and teleseismic distances remains unknown. The dynamic ground motions from the 11 March 2011 M<sub>W</sub>9.0 Tohoku-Oki megathrust earthquake are retrieved from broadband seismic records throughout the Korean Peninsula. The dynamic ground motions of the megathrust earthquake are dominated by low-frequency (<0.1 Hz) energy that is a mixture of elastogravity waves and seismic waves. The peak dynamic ground displacements in the Korean Peninsula reached ∼20 cm with horizontal permanent displacements of ∼2 cm or more. Radially-polarized elastogravity waves developed instantly at the event origin time. Very-long-period (<0.004 Hz) energy is a mixture of seismic waves and coseismic permanent displacements, presenting radially polarized retrograde particle motions for ∼600 s. The peak ground displacements and velocities for the Tohoku-Oki earthquake are larger than those for a local M<sub>W</sub>5.4 earthquake. The peak ground motions vary azimuthally following the source radiation pattern. The tangential peak ground displacement increases with distance along continental ray paths due to the development of crustally guided waves. Large and slow dynamic ground motions cause dynamic stress changes of ∼1.8 MPa in the lithosphere of the Korean Peninsula, while the properties of the mantle are scarcely affected by slow dynamic motions. The large long-period displacements induced by megathrust earthquakes may cause considerable long-duration distortion on large buildings at regional and teleseismic distances. The characteristic elastogravity-wave features may be used for detection of mass-dislocation events.</p>
Data and model of the 2014 Mw 6.9 Yutian Earthquake
<p>If your work results in an publication where you used our data, we kindly ask you to consider citing this article as</p> <p>Li, X., W. Xu, S. Jónsson, Y. Klinger, and G. Zhang (2020). Source Model of the 2014 Mw 6.9 Yutian Earthquake at the Southwestern End of the Altyn Tagh Fault in Tibet Estimated from Satellite Images, Seismol. Res. Lett. 91, 3161–3170,</p>
Data from: A geology and geodesy based model of dynamic earthquake rupture on the Rodgers Creek-Hayward-Calaveras fault system, California
<p>The Hayward fault in California's San Francisco Bay area produces large earthquakes, with the last occurring in 1868. We examine how physics-based dynamic rupture modeling can be used to numerically simulate large earthquakes on not only the Hayward fault, but also its connected companions to the north and south, the Rodgers Creek and Calaveras faults. Equipped with a wealth of images of this fault system, including those of its 3D geology and 3D geometry, in addition to inferences about its interseismic creep rate pattern and rock-friction behavior, we use a finite-element computer code to perform 3D dynamic earthquake rupture simulations. We find that the rock properties affect the locations and amount of slip produced in our simulated large earthquakes. Crucial factors that control rupture behavior in our modeling are the earthquake nucleation locations, the fault geometry, and the data that reveal where the fault system is creeping or locked. Our findings suggest that large Rodgers Creek-Hayward-Calaveras-Northern Calaveras (RC-H-C-NC) fault-system earthquakes may result from dynamic rupture that starts in a locked part of the fault system, but is then stopped by the creeping parts, leading to high magnitude-6 earthquakes; or, from dynamic rupture that starts in a locked part of the fault system, then cascades through some of the creeping parts, leading to magnitude-7 earthquakes.</p>
Supplementary: Integrated Earthquake Catalog of the Ossetian Sector of the Greater Caucasus
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Tsunami Deposits in the Guerrero Seismic Gap, Mexico: Insights from Location Analysis, Earthquake and Tsunami Models, and Proxy Dataset
<p><strong>Globally, the most significant tsunamigenic earthquakes have occurred along subduction zones. Catastrophic events surpassing magnitude 9, such as those witnessed in Chile, Sumatra, and Japan, have occurred in regions where instrumental records of similar events are lacking. Despite the absence of such occurrences along the 1000-kilometer-long Mexican subduction zone, historical and geological evidence strongly suggests the likelihood of a magnitude 8.6 tsunamigenic earthquake. However, the Guerrero seismic gap has remained devoid of high-magnitude earthquakes for over a century. In this study, we present findings from analyses of sediment grain size, geochemistry, microfossils, magnetic properties, and radiometric and optically stimulated luminescence dating conducted along the Guerrero coast. Our research provides compelling evidence of a 2000-year history of significant tsunamis triggered by potentially large earthquakes. Numerical modeling reinforces our conclusions, pointing to a magnitude >8 event occurring around the year 1300 in the Guerrero seismic gap. This evidence underscores the critical importance of evaluating earthquake and tsunami potential through long-term evidence and instrumental observations along subduction zones globally. Additionally, this dataset includes the locations of study sites, proxy data, and earthquake and tsunami models.</strong></p> <p><strong>Source data:</strong></p> <ol> <li>Grain size - Figure S1</li> <li>Geochemical - Figure S2</li> <li>Maximum tsunami wave amplitude - Figure 3d and S4</li> <li>Maximum tsunami wave amplitude - Figure S5c</li> </ol> <p> </p>
Digital Appendix: Seismotectonics of the Rawil Depression (Western Alps, Switzerland): Revisiting Faults, Earthquakes, and Crustal Stresses [Dataset]
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Earthquake catalog for the Baige landslide hazard cascades
<p>The file contains the earthquake catalog of the Baige landslide hazard cascades.</p>
Analysis of potential earthquake precursory pattern from Mw>=7.0 earthquakes in Mexico
<p><span>In this work, we study seismic precursors from air temperature data of the National Center for Environmental Prediction (NCEP), Global Navigation Satellite System (GNSS) based Total Electron Content (TEC) and electron density retrieved from Swarm satellite (Alpha) data in Mw>=</span><span>7.0 earthquakes in Mexico. </span>The spatial-temporal evolution of seismic thermal anomalies is explored through NCEP, and synergistic observations of Swarm satellite and GNSS station are capable of providing more comprehensive information about disturbances in ionosphere. Our study may help explain the lithosphere-atmosphere-ionosphere coupling before earthquakes.</p>
Historical earthquake data in northeastern Tibet
<p>This earthquake data is used in my paper submitted to JGR.</p>
The cGPS-derived postseismic displacements related to the 2021 Maduo earthquake in Qinghai province, China
<p>The dataset includes the cGPS-derived postseismic displacements related to the 2021 Maduo earthquake in Qinghai province, China. The tectonic deformations and the seasonal-like deformations are removed from the original GPS time series. Pre-earthquake observations are contained in some of the cGPS data.</p>
Shallow slip deficit and deep penetration of the 1920 Haiyuan Ms 8.5 earthquake, China
<p>The generated stochastic slip ruptures.</p>
Data and scripts for: An analysis of the dynamic range of Distributed Acoustic Sensing for Earthquake Early Warning
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The 2023 Mw 6.0 Jishishan Earthquake: A Slow Unilateral Rupture on a Blind Thrust Fault Revealed by High-Precision Earthquake Detection, Location, and Dynamic modeling
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Bulletin, catalog, and station information of the 2023 Jishishan Mw 6.0 earthquake
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Multitemporal inventory of landslides in the epicentral region of the 2017 Jiuzhaigou earthquake
<p>Multitemporal inventory of landslides in the epicentral region of the 2017 Jiuzhaigou earthquake</p>
The post-processing recipe for SAR data of the 2024 Mw 7.5 Noto earthquake
<p>The post-processing recipe for SAR data of the 2024 Mw 7.5 Noto earthquake.</p>
Southern Tibet earthquakes recorded on BIMA
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Surface rupture data from 2009 Karonga Earthquakes, Malawi
<p>I do not take any credit for the data compiled here. All surface rupture data is taken from: Macheyeki, A. S., Mdala, H., Chapola, L. S., Manhiça, V. J., Chisambi, J., Feitio, P., et al. (2015). Active fault mapping in Karonga-Malawi after the December 19, 2009 Ms 6.2 seismic event. <em>Journal of African Earth Sciences</em>, <em>102</em>, 233–246. https://doi.org/10.1016/j.jafrearsci.2014.10.010</p> <p>Data on the earthquake focal mechanisms and geodesy is taken from: Biggs, J., Nissen, E., Craig, T., Jackson, J., & Robinson, D. P. (2010). Breaking up the hanging wall of a rift‐border fault: The 2009 Karonga earthquakes, Malawi. <em>Geophysical Research Letters</em>, <em>37</em>(11).</p>
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.