1,721,006 research outputs found
Data and scripts of "Probabilistic Assessment of the Causes of Active Deformation in Greece, Western Anatolia, and the Balkans Using Finite Element Models"
No full textDescription of the data and scripts of the manuscript "Probabilistic Assessment of the Causes of Active Deformation in Greece, Western Anatolia, and the Balkans Using Finite Element Models" by Rob Govers, Matthew W. Herman, Lukas van de Wiel, and Nicolai Nijholt as initially submitted to AGU journal Tectonics October 2024
Data supplement of "Tectonic context and possible triggering of the 2019-2020 Puerto Rico earthquake sequence"
No full textPaper Abstract: An historically unprecedented seismic moment was released by crustal events of the 2019-2020 earthquake sequence near southwest Puerto Rico. The sequence involved at least two, and per-haps three interacting fault systems. The largest Mw 6.4 event was likely triggered by left lateral strike-slip events along the eastern extension of the North Boquerón Bay-Punta Montalva fault zone. The mainshock occurred in a normal fault zone that extends into a region where previous studies documented extensional deformation, beyond the Ponce fault and the Bajo Tasmanian fault. Coulomb stress changes by the mainshock may have triggered further normal faulting af-tershocks, left lateral strike-slip events in the region where these two fault zones interacted, and possibly right lateral strike-slip aftershocks along a third structure extending southward, the Guayanilla fault zone. Extension directions of the seismic sequence are consistently NNW-SSE oriented, in agreement with the GNSS-inferred motion direction of eastern Hispaniola relative to western Puerto Rico, and with crustal stress estimates for the overriding plate boundary zone.
Data in this repository was used for the figures and as input data for Coulomb stress modeling. The software for making the figures was Generic Mapping Tools (Wessel et al., 2019). The software for computing coseismic stress changes is available online (https://doi.org/10.5281/zenodo.3894137).
The data is provided in the main folder and 2 subfolders. Detailed information about these files as well as information on how the data is processed is given in the explanatory file readme.txt. Contact person is Dr Rob Govers - [email protected]
Model output for the paper "Offshore landward motion shortly after a subduction earthquake implies rapid relocking of the shallow megathrust"
No full textThis repository contains the relevant data (part of numerical model output) used to plot the figures in the main body of the manuscript entitled "Offshore landward motion shortly after a subduction earthquake implies rapid relocking of the shallow megathrust", by Mario D'Acquisto and Rob Govers.
Paper abstract: "Geodetic observations after large subduction earthquakes reflect multiple postseismic processes, including megathrust relocking. What the timing of relocking is, and how well observations constrain it, is unclear. It has been inferred to explain some observed landward motion that occurs within months. It has also been considered unable to explain other, greater landward motion, including off the coast of Japan beginning weeks after the 2011 Tohoku earthquake, which is attributed to postseismic relaxation. We use generic, 3D numerical models to show that relocking, particularly of the shallow interface, is needed for postseismic relaxation to produce landward motion on the tip of the overriding plate. We argue that this finding is consistent with previous simulations that implicitly relock the megathrust where afterslip is not included, that the Tohoku megathrust thus relocked within less than two months of the earthquake, and that the shallow megathrust probably behaves as a true, unstably sliding asperity."
The model consists of a three-dimensional (3D) finite element method (FEM) simulation of the megathrust earthquake cycle with two fully elastic plates and Maxwell viscoelastic mantle.
The software used to perform the simulations and extract the model output in the files stored here was GTECTON (Govers & Wortel, 1993, 2005; Govers et al., 2018), version 2021.0. The software used to generate the relevant figures in the paper from the data was Generic Mapping Tools (GMT) (Wessel et al., 2019) version 6.4.0.
Each directory corresponds to a different model. The meaning of each model name, as well as the meaning of the file name and the internal data format of the files, are specified in the readme file (readme.txt). All files are plain text files.
For more information regarding the goals, model features, and output, please refer to the paper.
Contact person: Mario D'Acquisto - [email protected]
Model output for the paper "Reconciling the conflicting extent of overriding plate deformation before and during megathrust earthquakes in South America, Sunda, and northeast Japan"
No full textThis repository contains the relevant data (part of numerical model output) used to plot the figures in the main body of the manuscript mentioned in the title, authored by Mario D’Acquisto, Taco Broerse, Celine P. Marsman, and Rob Govers, submitted for publication in Geophysical Journal International.
Paper abstract: "We aim to better understand the overriding plate deformation during the megathrust earthquake cycle. We estimate the spatial patterns of interseismic GNSS velocities in South America, Southeast Asia, and northern Japan and the associated uncertainties due to data gaps and velocity uncertainties. The interseismic velocities with respect to the overriding plate generally decrease with distance from the trench with a steep gradient up to a “hurdle”, beyond which the gradient is distinctly lower and velocities are small. The hurdle is located 500–1000 km away from the trench, for the trench-perpendicular velocity component, and either at the same distance or closer for the trench-parallel component. Significant coseismic displacements were observed beyond these hurdles during the 2010 Maule, 2004 Sumatra-Andaman, and 2011 Tohoku earthquakes. We hypothesize that both the interseismic hurdle and the coseismic response result from a mechanical contrast in the overriding plate. We test our hypothesis using physically consistent, generic, three-dimensional finite element models of the earthquake cycle. Our models show a response similar to the interseismic and coseismic observations for a compliant near-trench overriding plate and an at least 5 times stiffer overriding plate beyond the contrast. The model results suggest that hurdles are more prominently expressed in observations near strongly locked megathrusts. Previous studies inferred major tectonic or geological boundaries and seismological contrasts located close to the observed hurdles in the studied overriding plates. The compliance contrast probably results from thermal, compositional and thickness contrasts and might cause the observed focusing of smaller-scale deformation like backthrusting."
The software used to perform the simulations, extract the model output in the files stored here, and perform additional processing for the plotting of figures was GTECTON (Govers & Wortel, 1993, 2005; Govers et al., 2018), version 2021.0. The software used to plot the relevant figures in the paper from the data was Generic Mapping Tools (GMT) (Wessel et al., 2019) version 6.3.0.
Please refer to readme.txt and the paper for more information about the content of the repsitory and the methods and results of the modeling, respectively.
Contact person: Mario D'Acquisto - [email protected]
Model output for the paper "Reconciling the conflicting extent of overriding plate deformation before and during megathrust earthquakes in South America, Sunda, and northeast Japan"
No full textThis repository contains the relevant data (part of numerical model output) used to plot the figures in the main body of the manuscript mentioned in the title, authored by Mario D’Acquisto, Taco Broerse, Celine P. Marsman, and Rob Govers, submitted for publication in Geophysical Journal International.
Paper abstract: "We aim to better understand the overriding plate deformation during the megathrust earthquake cycle. We estimate the spatial patterns of interseismic GNSS velocities in South America, Southeast Asia, and northern Japan and the associated uncertainties due to data gaps and velocity uncertainties. The interseismic velocities with respect to the overriding plate generally decrease with distance from the trench with a steep gradient up to a “hurdle”, beyond which the gradient is distinctly lower and velocities are small. The hurdle is located 500–1000 km away from the trench, for the trench-perpendicular velocity component, and either at the same distance or closer for the trench-parallel component. Significant coseismic displacements were observed beyond these hurdles during the 2010 Maule, 2004 Sumatra-Andaman, and 2011 Tohoku earthquakes. We hypothesize that both the interseismic hurdle and the coseismic response result from a mechanical contrast in the overriding plate. We test our hypothesis using physically consistent, generic, three-dimensional finite element models of the earthquake cycle. Our models show a response similar to the interseismic and coseismic observations for a compliant near-trench overriding plate and an at least 5 times stiffer overriding plate beyond the contrast. The model results suggest that hurdles are more prominently expressed in observations near strongly locked megathrusts. Previous studies inferred major tectonic or geological boundaries and seismological contrasts located close to the observed hurdles in the studied overriding plates. The compliance contrast probably results from thermal, compositional and thickness contrasts and might cause the observed focusing of smaller-scale deformation like backthrusting."
The software used to perform the simulations, extract the model output in the files stored here, and perform additional processing for the plotting of figures was GTECTON (Govers & Wortel, 1993, 2005; Govers et al., 2018), version 2021.0. The software used to plot the relevant figures in the paper from the data was Generic Mapping Tools (GMT) (Wessel et al., 2019) version 6.3.0.
Please refer to readme.txt and the paper for more information about the content of the repsitory and the methods and results of the modeling, respectively.
Contact person: Mario D'Acquisto - [email protected]
Model output for the paper "On the cause of enhanced landward motion of the overriding plate after a major subduction earthquake"
No full textThis repository contains the relevant data (part of numerical model output) used to plot the figures in the main body of the manuscript entitled "On the cause of enhanced landward motion of the overriding plate after a major subduction earthquake", by Mario D'Acquisto, Matthew Herman, Riccardo Riva, and Rob Govers, submitted for publication in Journal of Geophysical Research: Solid Earth.
Paper abstract: "Greater landward velocities were recorded after 6 megathrust earthquakes in subduction zone regions adjacent to the ruptured portion. Previous explanations invoked either increased slip deficit accumulation or plate bending during postseismic relaxation, with different implications for seismic hazard. We investigate whether bending can be expected to reproduce this observed enhanced landward motion (ELM). We use 3D quasi-dynamic finite element models with periodic earthquakes. We find that afterslip downdip of the brittle megathrust exclusively produces enhanced trenchward surface motion in the overriding plate. Viscous relaxation produces ELM when a depth limit is imposed on afterslip. This landward motion results primarily from in-plane elastic bending of the overriding plate due to trenchward viscous flow in the mantle wedge near the rupture. Modeled ELM is, however, incompatible with the observations, which are an order of magnitude greater and last longer after the earthquake. Varying mantle viscosity, plate elasticity, maximum afterslip depth, earthquake size, and megathrust locking outside of the rupture does not significantly change this conclusion. The observed ELM consequently appears to reflect faster slip deficit accumulation, implying a greater seismic hazard in lateral segments of the subduction zone."
The model consists of a three-dimensional (3D) finite element method (FEM) simulation of the megathrust earthquake cycle with two fully elastic plates and Maxwell viscoelastic mantle.
The software used to perform the simulations and extract the model output in the files stored here was GTECTON (Govers & Wortel, 1993, 2005; Govers et al., 2018), version 2021.0. The software used to generate the relevant figures in the paper from the data was Generic Mapping Tools (GMT) (Wessel et al., 2019) version 6.3.0.
Each directory corresponds to a different model. The meaning of each model name, as well as the meaning of the file name and the internal data format of the files, are specified in the readme file (readme.txt). All files are plain text files.
For more information regarding the goals, model features, and output, please refer to the paper.
Contact person: Mario D'Acquisto - [email protected]
Data accompanying "Development of an efficient model to calculate subsidence above the Groningen gas field"
No full textThis data package accompanies: Wouters, M.C., Govers, R. & Hanssen, R.F., "Development of an efficient model to calculate subsidence above the
Groningen gas field", submitted to Netherlands Journal of Geosciences.
The data package consist of the workflow described in the accompanying manuscript, and includes the in- and output files of the reported results. An overview of the workflow, and a description of the files contained in the package is provided in README.txt. Instructions for the software installation, including all programs and packages that are required to run the workflow can be found in README_installation.txt. README_figures.txt summarises where to find the plotted data, plotting scripts, and resulting figure files associated with the figures of the manuscript
Data accompanying "Development of an efficient model to calculate subsidence above the Groningen gas field"
No full textThis data package accompanies: Wouters, M.C., Govers, R. & Hanssen, R.F., "Development of an efficient model to calculate subsidence above the
Groningen gas field", submitted to Netherlands Journal of Geosciences.
The data package consist of the workflow described in the accompanying manuscript, and includes the in- and output files of the reported results. An overview of the workflow, and a description of the files contained in the package is provided in README.txt. Instructions for the software installation, including all programs and packages that are required to run the workflow can be found in README_installation.txt. README_figures.txt summarises where to find the plotted data, plotting scripts, and resulting figure files associated with the figures of the manuscript
Data supplement of "Tectonic context and possible triggering of the 2019-2020 Puerto Rico earthquake sequence"
No full textPaper Abstract: An historically unprecedented seismic moment was released by crustal events of the 2019-2020 earthquake sequence near southwest Puerto Rico. The sequence involved at least two, and per-haps three interacting fault systems. The largest Mw 6.4 event was likely triggered by left lateral strike-slip events along the eastern extension of the North Boquerón Bay-Punta Montalva fault zone. The mainshock occurred in a normal fault zone that extends into a region where previous studies documented extensional deformation, beyond the Ponce fault and the Bajo Tasmanian fault. Coulomb stress changes by the mainshock may have triggered further normal faulting af-tershocks, left lateral strike-slip events in the region where these two fault zones interacted, and possibly right lateral strike-slip aftershocks along a third structure extending southward, the Guayanilla fault zone. Extension directions of the seismic sequence are consistently NNW-SSE oriented, in agreement with the GNSS-inferred motion direction of eastern Hispaniola relative to western Puerto Rico, and with crustal stress estimates for the overriding plate boundary zone.
Data in this repository was used for the figures and as input data for Coulomb stress modeling. The software for making the figures was Generic Mapping Tools (Wessel et al., 2019). The software for computing coseismic stress changes is available online (https://doi.org/10.5281/zenodo.3894137).
The data is provided in the main folder and 2 subfolders. Detailed information about these files as well as information on how the data is processed is given in the explanatory file readme.txt. Contact person is Dr Rob Govers - [email protected]
Model output for the paper "Estimating Geodynamic Model Parameters from Geodetic Observations Using a Particle Method"
No full textThis dataset contains the input and output files of the synthetic and real data assimilation experiments for interseismic deformation associated with the 2011 Tohoku-Oki earthquake. All methods, results, bibliography/citations, and figures are described in detail in the publication: Marsman et al., (2023): Estimating Geodynamic Model Parameters from Geodetic Observations Using a Particle Method, Geophysical Journal International (DOI: 10.1093/gji/ggad450)
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