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  1. Fault strength evolution during the seismic cycle: Insights from the laboratory

    10 Mar 2023 | Contributor(s): John Bedford

    Geophysical evidence suggests that some faults are frictionally strong, in agreement with laboratory measurements of quasi-static frictional strength (μ ≈ 0.6-0.8) for many crustal materials; whereas others studies have found that some faults are weak when compared to laboratory friction...

  2. 2020 Crustal Deformation Modeling Workshop Report

    27 Jul 2022 | Contributor(s): Brad Aagaard, Sylvain Barbot, Brittany Erickson, Matthew Knepley, Mark Simons, Charles Williams

    Workshop report

  3. 2022 Mainshock and aftershock sequence simulations in a nonplanar fault network

    19 May 2022 | Webinars | Contributor(s): So Ozawa, Ryosuke Ando

    Aftershocks seem to be located along the trace of the mainshock fault; however, due to the location error, we do not know their exact location relative to the mainshock fault. Here, we hypothesize that most aftershocks occur on small subsidiary faults instead of the mainshock fault, and they...

  4. 2022 Poroelastic Implementation in PyLith: Gateway to Multiphysics

    13 May 2022 | Webinars | Contributor(s): Robert L Walker

    Thursday May 12, 2022 @ 2P PDT Poroelastic Implementation in PyLith: Gateway to Multiphysics Robert Walker, SUNY Buffalo PyLith, a community, open-source code (https://geodynamics.org/resources/pylith) for modeling quasi-static and dynamic crustal deformation with an emphasis on earthquake...

  5. 2022 Energy transfer among flow and magnetic fields with different equatorial symmetry during the dipole reversal in a geodynamo simulation

    17 Feb 2022 | Webinars | Contributor(s): Takumi Kera, Hiroaki Matsui, Masaki Matsushima, Yuto Katoh

    The geomagnetic field has reversed its polarity, and some numerical dynamos have suggested that anti-symmetric flow with respect to the equator plays a role in reversals. Olson et al., (2004) suggested that the equatorial antisymmetric flow is temporarily strengthened, and transports a locally...

  6. 2021 SMOREs Introduction

    02 Nov 2021 | Webinars | Contributor(s): John Naliboff

    2021 SMOREs ShowcaseJohn Naliboff, New Mexico Tech

  7. 2021 Interactions between Lithospheric Instabilities and Formation of Mantle Plumes in Venus

    02 Nov 2021 | Webinars | Contributor(s): Hiva Mohammadzadeh

    2021 SMOREs ShowcaseHiva Mohammadzadeh, Los Angeles Pierce College

  8. 2021 Early Earth Influence of Radiogenic Heating on Mid-Ocean Ridge Depths and Seafloor Subsidence

    02 Nov 2021 | Webinars | Contributor(s): Keneni Godana

    2021 SMOREs ShowcaseKeneni Godana, University of Illinois at Chicago

  9. 2021 Bayesian Uncertainty Quantification of Subduction Zone Rheology from the Geoid

    02 Nov 2021 | Webinars | Contributor(s): Elena Ehrlich

    2021 SMOREs ShowcaseElena Ehrlich, North Carolina State University

  10. 2021 As Above So Below: A Simulation of the Continental Lithosphere and LLSVPs as Thermal Insulators Using ASPECT

    02 Nov 2021 | Webinars | Contributor(s): Dante Hickey

    2021 SMOREs ShowcaseDante Hickey, Reed College

  11. PyLith

    27 Oct 2021 | Software: Download | Contributor(s): Brad Aagaard (primary-developer), Charles A. Williams (primary-developer), Matthew Knepley (primary-developer)

    PyLith is a finite-element code for dynamic and quasistatic simulations of crustal deformation, primarily earthquakes and volcanoes. Binary packages are available for macOS and Linux. Detailed installation instructions for the binary packages are in the PyLith manual.

  12. Relax

    26 Oct 2021 | Software: Download | Contributor(s): Sylvain Barbot (primary-developer)

    Relax implements a semi-analytic Fourier-domain solver and equivalent body forces to compute quasi-static relaxation of stress perturbation.It is not an acronym, it's a motto!The open-source program Relax evaluates the displacement and stress in a half space with gravity due to...

  13. Virtual Quake

    26 Oct 2021 | Software: Download | Contributor(s): John M. Wilson, Kasey W. Schultz, Eric M. Heiein, Michael K. Sacks, John B. Rundle

    Virtual Quake (formerly Virtual California) is a boundary element code that performs simulations of fault systems based on stress interactions between fault elements to understand long term statistical behavior.

  14. SELEN

    25 Oct 2021 | Software: Download | Contributor(s): Giorgio Spada (primary-developer), Daniele Melini (primary-developer)

    SELEN: a program for solving the "Sea Level Equation.The open source program SELEN solves numerically the so-called "Sea Level Equation" (SLE) for a spherical, layered, non-rotating Earth with Maxwell viscoelastic rheology. The SLE is an integral equation that was introduced in...

  15. LithoMop

    22 Oct 2021 | Software: Download | Contributor(s): Charles A. Williams (primary-developer)

    LithoMop is a finite element code for the solution of the visco-elastic/plastic deformation that was designed for lithospheric modeling problems.A newer version of LithoMop, called PyLith, has been released by CIG.

  16. 2020 Numerical models of lower crustal flow explain Yellowstone's "tectonic parabola"

    07 Oct 2021 | Webinars | Contributor(s): Jonathan Perry-Houts

    Several hypotheses exist for the origin of the seismically active region of high topography surrounding the Yellowstone hotspot track. Among these is the idea that a dense mid-crustal sill has driven viscous lower crust away from the hotspot track, producing crustal thinning/subsidence in the...

  17. Extended Finite Element Methods for Crustal Deformation Simulation

    30 Mar 2021 | Workshops | Contributor(s): Ethan Coon, Bruce Shaw, Marc Spiegelman

    Extended Finite Element Methods for Crustal Deformation Simulation. June 14-18, 2010. Ethan Coon. 

  18. Tomography of the Mojavian Lithosphere Viscosity from Space Geodetic data of the Landers and Hector Mine Earthquakes

    30 Mar 2021 | Workshops | Contributor(s): Sylvain Barbot, Yuri Fialko

    Tomography of the Mojavian Lithosphere Viscosity from Space Geodetic data of the Landers and Hector Mine Earthquakes. June 14-18, 2010. Sylvain Barbot. 

  19. 3D numerical mechanical modeling of the southern San Andreas Fault system

    30 Mar 2021 | Workshops | Contributor(s): Benjamin Hooks, B.R. Smith-Konter

    3D numerical mechanical modeling of the southern San Andreas Fault system. June 14-18, 2010. Benjamin Hooks. 

  20. A one dimensional model of Earth structure in the western United States from GPS observation of ocean tidal load

    30 Mar 2021 | Workshops | Contributor(s): Takeo Ito, Mark Simons

    A one dimensional model of Earth structure in the western United States from GPS observation of ocean tidal load. June 14-18, 2010. Takeo Ito. 

  21. Rheology of the brittle-plastic transition: Role of fabric and phyllosilicates

    30 Mar 2021 | Workshops | Contributor(s): Laurent G.J. Montesi

    Rheology of the brittle-plastic transition: Role of fabric and phyllosilicates. June 14-18, 2010. Laurent G.J. Montesi. 

  22. Community Benchmarks for Code Verification

    30 Mar 2021 | Workshops | Contributor(s): Brad Aagaard

    Community Benchmarks for Code Verification. June 14-18, 2010. Brad Aagaard. 

  23. Constructing constitutive relations for faulting at high and low sliding speeds

    30 Mar 2021 | Workshops | Contributor(s): Nick Beeler

    Constructing constitutive relations for faulting at high and low sliding speeds. June 14-18, 2018. Nick Beeler. 

  24. Tectonic Tremor Beneath the San Andreas Fault: Implications for lower crustal deformation

    30 Mar 2021 | Workshops | Contributor(s): David R. Shelly, Jeanne Hardebeck, Gary Fuis, Jessica Murray-Moraleda, Bill Ellsworth, Roland Bürgmann, Bob Nadeau, Greg Beroza

    Tectonic Tremor Beneath the San Andreas Fault: Implications for lower crustal deformation. June 14-18, 2010. David R. Shelly. 

  25. A model for ductile shear initiated by shear fracture: Application to short term and secular fault slip.

    30 Mar 2021 | Workshops | Contributor(s): Luc Lavier, Rick Bennett, Liz Logan, Gianreto Manatschal, Nick Hayman

    A model for ductile shear initiated by shear fracture: Application to short term and secular fault slip. June 14-18, 2010. Luc Lavier. 

  26. An overview of the 4 April 2010 Sierra El Mayor-Cucapah (Baja California) earthquake

    30 Mar 2021 | Workshops | Contributor(s): Rich Briggs, Shengji Wei, Eric Fielding, Sebastien Leprince, Anthony Sladen, Risheng Chu, Mark Simons, Jean-Philippe Avouac, Egill Hauksson, Donald V. Helmberger, Rowena Lohman, Ken Hudnut, Sinan Akciz

    An overview of the 4 April 2010 Sierra El Mayor-Cucapah (Baja California) earthquake. June 14-18, 2010. Rich Briggs. 

  27. The January 12, 2010 Haiti Earthquake

    30 Mar 2021 | Workshops | Contributor(s): Eric Calais, Andrew Freed, Glen Mattioli, Pamela Jansma, Falk Amelung, Timothy Dixon, Sigurjon Jonsson, Claude Prepetit, Roberte Momplaisir

    The January 12, 2010 Haiti Earthquake. June 10-14, 2010. Eric Calais. 

  28. News from the Chilean Front

    30 Mar 2021 | Workshops | Contributor(s): Jorge Baron, Jim Beck, Mike Bevis, Mauro Blanco, Ben Brooks, Dana Caccamise, James Foster, Jeff Genrich, Erik Kendrik, Nina Lin, Sarah Minson, Fransisco Ortega, Susan Owen, Hector Parra, Anthony Sladen, Mark Simons, Bob Smalley

    News from the Chilean Front. June 14-18, 2010. Jorge Baron. 

  29. The USGS Response to Recent Large Earthquakes: A Seismological Overview of the Haiti, Chile, and El Mayor Events

    30 Mar 2021 | Workshops | Contributor(s): Gavin Hayes

    The USGS Response to Recent Large Earthquakes: A Seismological Overview of the Haiti, Chile, and El Mayor Events. June 14-18, 2010. Gavin Hayes. 

  30. Extending PyLith

    30 Mar 2021 | Workshops | Contributor(s): Brad Aagaard, Charles Williams, Matthew Knepley, Surendra Somala

    Extending PyLith. June 14-18, 2010. Brad Aagaard. 

  31. Generating Meshes for Geodynamic Problems Using Cubit

    30 Mar 2021 | Workshops | Contributor(s): Charles Williams, Rowena Lohman

    Generating Meshes for Geodynamic Problems Using Cubit. June 14-18, 2010. Charles Williams. 

  32. PyLith 1.5: Friction, Small Strains, and Elastoplasticity

    30 Mar 2021 | Workshops | Contributor(s): Brad Aagaard, Charles Williams, Matthew Knepley, Surendra Somala

    PyLith 1.5: Friction, Small Strains, and Elastoplasticity. June 14-18, 2010. Brad Aagaard. 

  33. LaGriT Tutorial

    30 Mar 2021 | Workshops | Contributor(s): Carl Gable

    LaGriT Tutorial. June 14-18, 2010. Carl Gable. 

  34. Release note summary: Cubit 11.1-12.0-12.1

    30 Mar 2021 | Workshops | Contributor(s): Rowena Lohman, Steve Owen

    Release note summary: Cubit 11.1-12.0-12.1. June 14-18, 2010. Rowena Lohman. 

  35. What's New In PyLith 1.5.0?

    30 Mar 2021 | Workshops | Contributor(s): Charles Williams, Brad Aagaard, Matthew Knepley, Surendra Somala, Sue Kientz, Lief Strand

    What's New In PyLith 1.5.0?. June 14-18, 2010. Charles Williams. 

  36. PyLith 1.5 Tutorial

    30 Mar 2021 | Workshops | Contributor(s): Brad Aagaard

    PyLith 1.5 Tutorial. June 14-18, 2010. Brad Aagaard. 

  37. Meshing and Set Up Workflow

    30 Mar 2021 | Workshops | Contributor(s): Carl Gable

    Meshing and Set Up Workflow. June 14-18, 2010. Carl Gable. 

  38. Introduction to CUBIT: A quick tutorial and some simple examples

    30 Mar 2021 | Workshops | Contributor(s): Rowena Lohman

    Introduction to CUBIT: A quick tutorial and some simple examples. June 14-18, 2010. Rowena Lohman. 

  39. Building GeoFEST Models

    30 Mar 2021 | Workshops | Contributor(s): Jay Parker

    Building GeoFEST Models. June 14-18, 2010. Jay Parker. 

  40. PyLith

    30 Mar 2021 | Workshops | Contributor(s): Brad Aagaard, Charles Williams, Matthew Knepley, Surendra Somala, Sue Kientz, Leif Strand

    PyLith. June 14-18, 2010. Brad Aagaard. 

  41. Finite-Element Modeling for Crustal Deformation

    30 Mar 2021 | Workshops | Contributor(s): Brad Aagaard

    Finite-Element Modeling for Crustal Deformation. June 14-18, 2010. Brad Aagaard. 

  42. 2019 The Release of the GEM Global Active Faults Database and Global Seismic Hazard Map

    04 Feb 2021 | Webinars | Contributor(s): Richard Styron

    In late 2018, the Global Earthquake Model Foundation (GEM) released the initial version of several major products relating to seismic hazard and risk, including the Global Seismic Hazard Map, the Global Seismic Risk Map, and the Global Active Faults Database. Though these are intended primarily...

  43. 2019 HeFESTO: A tool for exploring Earth's physical properties and their effects on mantle dynamics

    04 Feb 2021 | Webinars | Contributor(s): Carolina Lithgow-Bertelloni, Lars Stixrude

    The minerals that exist at the extreme pressure and temperature conditions of the mantle and their physical properties determine the dynamics of the mantle. Both are also critical for comparison with seismic observations that put constraints on our knowledge of mantle structure and...

  44. 2019 Introduction to Quagmire

    04 Feb 2021 | Webinars | Contributor(s): Louis Moresi, Ben Mather, Romain Beucher

    Quagmire is an open source, parallel python module for modelling surface processes and landscape evolution. It comes from the Underworld geodynamics group and has many common design patterns to Underworld. For starters, this is not an out-of-the-box landscape evolution code — it is instead...

  45. 2018 Introduction to thermal-mechanical lithosphere models with surface processes

    04 Feb 2021 | Webinars | Contributor(s): Louis Moresi, Romain Beucher

    Surface processes including erosion, transport and sedimentation have the potential to strongly influence crustal and lithospheric deformation whether passively, through isostatic response, or more actively by affecting the thermal structure, the potential energy field, and / or the local stress...

  46. 2018 Pythonic Geodynamics

    04 Feb 2021 | Webinars | Contributor(s): Gabriele Morra, David A. Yuen, Sang-Mook Lee

    Students and young researchers who want to learn to use computational tools for geodynamic modeling have the option to choose among a wide range of numerical tools. I will show how Python and its libraries represent an easy-to-use platform for self-learning, with performance close to compiled...

  47. 2017 Geodynamic modeling with staggered finite differences and marker in cell: theory, teaching and examples

    04 Feb 2021 | Webinars | Contributor(s): Taras Gerya

    Numerical modeling of geodynamic processes is an essential approach in both science and industry with ever- growing demand and high efficiency/cost ratio. Current trend in geodynamic modeling is to develop universal approaches with potentially unlimited number of applications. One simple...

  48. 2017 Introduction to the spectral-infinite-element method

    04 Feb 2021 | Webinars | Contributor(s): Hom Nath Gharti, Jeroen Tromp

    The governing equations for the elastic-gravitational deformation of an Earth model involve a perturbed gravitational potential. The gravitational potential is governed by Poisson’s equation inside the Earth and by Laplace’s equation in the rest of space. The infinite domain...

  49. 2016 Software Practices in Computational Science Communities – an Overview

    04 Feb 2021 | Webinars | Contributor(s): Anshu Dubey

    Scientific code developers typically adopt software processes derived from the mainstream (non-scientific) community when continuing without them becomes impractical. However, many software best practices need modification and/or customization, partly because the codes are used for...

  50. 2016 Resolution analysis by random probing

    04 Feb 2021 | Webinars | Contributor(s): Andreas Fichtner, Tristan van Leeuwen

    We present a new method for resolution analysis in tomography, based on stochastic probing of the Hessian or resolution operators. Key properties of the method are (i) low algorithmic complexity and easy implementation, (ii) applicability to any tomographic technique, including full-waveform...