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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. Responsibilities of Working Groups

    12 Oct 2021 | Documents | Contributor(s): Executive Committee, Science Steering Committee

    Roles and responsibilities of Working Groups.Approved 24 August 2021.

  17. Responsibilities of the SSC

    12 Oct 2021 | Documents | Contributor(s): Executive Committee, Science Steering Commitee

    Roles and responsibilities of the Science Steering Committee.Approved 24 August 2021.

  18. Responsibilities of the EC

    12 Oct 2021 | Documents | Contributor(s): Executive Committee, Science Steering Committee

    Describes the roles and responsibilities of the Executive Committee.Approved 24 August 2021

  19. 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...

  20. Megathrust friction in the 2010 Maule earthquake area in relation to forearc morphology and mechanical stability, and to earthquake rupture dynamics

    02 Apr 2021 | Workshops | Contributor(s): Nadaya Cubas, J.P. Avouac, N. Lapusta, Y. Leroy, P. Souloumiac

    Megathrust friction in the 2010 Maule earthquake area in relation to forearc morphology and mechanical stability, and to earthquake rupture dynamics. June 18-22, 2012. Nadaya Cubas, J.P. Avouac, N. Lapusta. 

  21. The nucleation of a laboratory earthquake: Implications for foreshocks and minimum earthquake size

    02 Apr 2021 | Workshops | Contributor(s): Greg McLaskey, Brian Kilgore, Nick Beeler, Dave Lockner

    The nucleation of a laboratory earthquake: Implications for foreshocks and minimum earthquake size. June 18-22, 2012. Greg McLaskey, Brian Kilgore, Nick Beeler, Dave Lockner. 

  22. Slow slip events simulated using a friction law with a velocity-weakening to -strengthening transition

    02 Apr 2021 | Workshops | Contributor(s): Jessica Hawthorne, Allan Rubin

    Slow slip events simulated using a friction law with a velocity-weakening to -strengthening transition. June 18-22, 2012. Jessica Hawthorne, Allan Rubin. 

  23. Crust‐mantle interactions of the Escalante anomaly, Colorado Plateau

    02 Apr 2021 | Workshops | Contributor(s): Jolante van Wijk

    Crust‐mantle interactions of the Escalante anomaly, Colorado Plateau. June 18-22, 2012. Jolante van Wijk. 

  24. Geodetic Source Inversion Validation

    02 Apr 2021 | Workshops | Contributor(s): Rowena Lohman

    Geodetic Source Inversion Validation. June 18-22, 2012. Rowena Lohman. 

  25. Understanding slip on oceanic transform faults through observations from the lab to the fault scale

    02 Apr 2021 | Workshops | Contributor(s): Margaret Boettcher

    Understanding slip on oceanic transform faults through observations from the lab to the fault scale. June 18-22, 2012. Margaret Boettcher. 

  26. Constraints on slow slip events from geodetic observations

    02 Apr 2021 | Workshops | Contributor(s): David Schmidt, Haiying Gao

    Constraints on slow slip events from geodetic observations. June 18-22, 2012. David Schmidt, Haiying Gao. 

  27. Bayesian Earthquake Modeling

    02 Apr 2021 | Workshops | Contributor(s): Sarah Minson, Mark Simons, James L. Beck, Junle Jiang, Fransisco H. Ortega, Asaf Inbal, Susan E. Owen, Anthony Sladen

    Bayesian Earthquake Modeling. June 18-22, 2012. Sarah Minson. 

  28. Interpreting interseismic observations with elastic block models

    02 Apr 2021 | Workshops | Contributor(s): Jack Loveless, Brendan Meade

    Interpreting interseismic observations with elastic block models. June 18-22, 2012. Jack Loveless, Brendan Meade. 

  29. Scientific issues raised by using GPS data to estimate fault slip rates

    02 Apr 2021 | Workshops | Contributor(s): Kaj Johnson, Bob Simpson, Jim Savage, Wayne Thatcher

    Scientific issues raised by using GPS data to estimate fault slip rates. June 18-22, 2012. Kaj Johnson & UCERF3/GPS Group, Bob Simpson, Jim Savage, Wayne Thatcher. 

  30. Fault slip rates, distributed deformation rates, and long-term seismicity estimated with kinematic F-E program NeoKinema

    02 Apr 2021 | Workshops | Contributor(s): Peter Bird

    Fault slip rates, distributed deformation rates, and long-term seismicity estimated with kinematic F-E program NeoKinema. June 18-22, 2012. Peter Bird. 

  31. CUBIT: Examples of 3-D meshing

    02 Apr 2021 | Workshops | Contributor(s): Brad Aagaard

    CUBIT: Examples of 3-D meshing. June 18-22, 2012. Brad Aagaard. 

  32. Green's Functions: Inverting Geodetic Data for Fault Slip with 2-D Earth Structure

    02 Apr 2021 | Workshops | Contributor(s): Charles Williams, Brad Aagaard, Matt Knepley

    Green's Functions: Inverting Geodetic Data for Fault Slip with 2-D Earth Structure. June 18-22, 2012. Charles Williams, Brad Aagaard, Matt Knepley. 

  33. Crustal Deformation Modeling Tutorial: PyLith: Introduction to Dynamic Spontaneous Rupture

    02 Apr 2021 | Workshops | Contributor(s): Brad Aagaard, Matthew Knepley, Charles Williams

    Crustal Deformation Modeling Tutorial: PyLith: Introduction to Dynamic Spontaneous Rupture. June 18-22, 2012. Brad Aagaard, Matthew Knepley, Charles Williams. 

  34. Crustal Deformation Modeling Tutorial: PyLith: Modeling Afterslip with Friction

    02 Apr 2021 | Workshops | Contributor(s): Brad Aagaard, Matthew Knepley, Charles Williams

    Crustal Deformation Modeling Tutorial: PyLith: Modeling Afterslip with Friction. June 18-22, 2012. Brad Aagaard, Matthew Knepley, Charles Williams. 

  35. Using PETSc Solvers in PyLith

    02 Apr 2021 | Workshops | Contributor(s): Matthew Knepley, Brad Aagaard, Charles Williams

    Using PETSc Solvers in PyLith. June 18-22, 2012. Matthew Knepley, Brad Aagaard, Charles Williams. 

  36. CUBIT: 3-D Meshing with Nonplanar Surfaces

    02 Apr 2021 | Workshops | Contributor(s): Charles Williams, Brad Aagaard, Matt Knepley

    CUBIT: 3-D Meshing with Nonplanar Surfaces. June 18-22, 2012. Charles Williams, Brad Aagaard, Matt Knepley. 

  37. Crustal Deformation Modeling Tutorial: PyLith: Introduction to Fault Friction

    02 Apr 2021 | Workshops | Contributor(s): Brad Aagaard, Matthew Knepley, Charles Williams

    Crustal Deformation Modeling Tutorial: PyLith: Introduction to Fault Friction. June 18-22, 2012. Brad Aagaard, Matthew Knepley, Charles Williams.

  38. Crustal Deformation Modeling Tutorial: PyLith/CUBIT: 2-D subduction zone with coseismic and interseismic deformation

    02 Apr 2021 | Workshops | Contributor(s): Brad Aagaard, Charles Williams, Matthew Knepley

    Crustal Deformation Modeling Tutorial: PyLith/CUBIT: 2-D subduction zone with coseismic and interseismic deformation. June 18-22, 2012. Brad Aagaard, Charles Williams, Matthew Knepley. 

  39. Crustal Deformation Modeling Tutorial: Overview of CUBIT

    02 Apr 2021 | Workshops | Contributor(s): Brad Aagaard, Rowena Lohman, Charles Williams, Matthew Knepley

    Crustal Deformation Modeling Tutorial: Overview of CUBIT. June 18-22, 2012. Brad Aagaard, Rowena Lohman, Charles Williams, Matthew Knepley. 

  40. Overview of PyLith

    02 Apr 2021 | Workshops | Contributor(s): Charles Williams, Brad Aagaard, Matthew Knepley

    Overview of PyLith. June 18-22, 2012. Charles Williams, Brad Aagaard, Matthew Knepley. 

  41. Relax: Semi-analytic Fourier-domain solver and equivalent body forces for quasi-static relaxation of stress perturbation

    02 Apr 2021 | Workshops | Contributor(s): Sylvain Barbot

    Relax: Semi-analytic Fourier-domain solver and equivalent body forces for quasi-static relaxation of stress perturbation. June 18-22, 2012. Sylvain Barbot. 

  42. 2007 CIG/SPICE/IRIS Workshop Program and Abstracts

    30 Mar 2021 | Workshops | Contributor(s): Organizing Committee

    2007 CIG/SPICE/IRIS Workshop Program and Abstracts. October 9-11, 2007. 

  43. CIG Bylaws 2018

    30 Mar 2021 | Documents | Contributor(s): Staff

    Bylaws of Computational Infrastructure for Geodynamics (CIG). As amended by the Electorate, June 30, 2018. 

  44. Overview of the High-Order ADER-DG Method for Numerical Seismology

    18 Feb 2021 | Workshops | Contributor(s): Martin Käser, Michael Dumbser, Josep de la Puente, Verena Hermann, Cristobal Castro

    Overview of the High-Order ADER-DG Method for Numerical Seismology. October 9-11, 2007. Martin Käser, Michael Dumbser, Josep de la Puente, Verena Hermann, Cristobal Castro.

  45. Rayleigh and Love wave tomography of the western United States from ambient seismic noise using US Array

    17 Feb 2021 | Workshops | Contributor(s): Fan-Chi Lin, Morgan Moschetti, Michael Ritzwoller

    Rayleigh and Love wave tomography of the western United States from ambient seismic noise using US Array. October 9-11, 2007. Fan-Chi Lin, Morgan P. Moschetti, and Michael H. Ritzwoller. 

  46. CIG Geodynamics Software: Modeling Tools for the Earth Science Community

    17 Feb 2021 | Workshops | Contributor(s): Eh Tan

    CIG Geodynamics Software: Modeling Tools for the Earth Science Community. October 9-11, 2007. Eh Tan. 

  47. SPECFEM3D_GLOBE

    17 Feb 2021 | Workshops | Contributor(s): David Michéa

    SPECFEM3D_GLOBE. October 9-11, 2007. David Michéa. 

  48. Synthetic seismograms for stagnant slab model

    17 Feb 2021 | Workshops | Contributor(s): Seiji Tsuboi, H. Sugioka, M. Obayashi, Y. Fukao, Yuan Gao

    Synthetic seismograms for stagnant slab model. October 9-11, 2007. Seiji Tsuboi, H. Sugioka, M. Obayashi, Y. Fukao, Yuan Gao.

  49. ShakeOut and its effects in Los Angeles and Oxnard areas

    17 Feb 2021 | Workshops | Contributor(s): Leonardo Ramirez-Guzman, Ricardo Taborda, Julio López, John Urbanic, Jacobo Bielak, David O'Hallaron

    ShakeOut and its effects in Los Angeles and Oxnard areas. October 9-11, 2007. Leonardo Ramírez-Guzmán, Ricardo Taborda, Julio López, John Urbanic, Jacobo Bielak and David O’Hallaron. 

  50. Wave Propagation Project (WPP): A New Open-Source Tool Supporting Computational Seismology at LLNL

    17 Feb 2021 | Workshops | Contributor(s): Arthur Rodgers

    Wave Propagation Project (WPP): A New Open-Source Tool Supporting Computational Seismology at LLNL. October 9-11, 2007. Arthur Rodgers.