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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...
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2022 Mainshock and aftershock sequence simulations in a nonplanar fault network
19 May 2022 | | 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...
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2022 Poroelastic Implementation in PyLith: Gateway to Multiphysics
13 May 2022 | | 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...
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May 12 2022
Poroelastic Implementation in PyLith: Gateway to Multiphysics
Robert Walker, SUNY BuffaloPyLith, a community, open-source code (https://geodynamics.org/resources/pylith) for modeling quasi-static and dynamic crustal deformation with an emphasis on...
https://geodynamics.org/events/details/236
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Apr 14 2022
Interaction Between Earthquakes and Interseismic Deformation
Kali Allison, UC DavisEarthquake cycle models can be used to understand the processes that govern fault and shear zone structure and to link these processes to earthquake cycle...
https://geodynamics.org/events/details/235
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Mar 10 2022
Dynamo Simulations of Planetary Cores
Ryan Orvedahl, UC DavisThe majority of solar system planets possess global, or large-scale, magnetic fields. These magnetic fields are all thought to be generated by the dynamo mechanism, whereby...
https://geodynamics.org/events/details/234
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2022 Energy transfer among flow and magnetic fields with different equatorial symmetry during the dipole reversal in a geodynamo simulation
17 Feb 2022 | | 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...
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Feb 17 2022
Energy transfer among flow and magnetic fields with different equatorial symmetry during the dipole reversal in a geodynamo simulation
Takumi Kera, Tohoku University[movie]The geomagnetic field has reversed its polarity, and some numerical dynamos have suggested that anti-symmetric flow with respect to the equator plays a...
https://geodynamics.org/events/details/252
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Jan 13 2022
Introduction to reference Earth models and datasets using AVNI
Pritwiraj ‘Raj’ Moulik, Princeton University• Open-source Python package with APIs to handle data and compute intensive queries• Introduce storage formats or classes for...
https://geodynamics.org/events/details/233
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2021 SMOREs Introduction
02 Nov 2021 | | Contributor(s):: John Naliboff
2021 SMOREs ShowcaseJohn Naliboff, New Mexico Tech
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2021 Interactions between Lithospheric Instabilities and Formation of Mantle Plumes in Venus
02 Nov 2021 | | Contributor(s):: Hiva Mohammadzadeh
2021 SMOREs ShowcaseHiva Mohammadzadeh, Los Angeles Pierce College
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2021 Early Earth Influence of Radiogenic Heating on Mid-Ocean Ridge Depths and Seafloor Subsidence
02 Nov 2021 | | Contributor(s):: Keneni Godana
2021 SMOREs ShowcaseKeneni Godana, University of Illinois at Chicago
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2021 Bayesian Uncertainty Quantification of Subduction Zone Rheology from the Geoid
02 Nov 2021 | | Contributor(s):: Elena Ehrlich
2021 SMOREs ShowcaseElena Ehrlich, North Carolina State University
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2021 As Above So Below: A Simulation of the Continental Lithosphere and LLSVPs as Thermal Insulators Using ASPECT
02 Nov 2021 | | Contributor(s):: Dante Hickey
2021 SMOREs ShowcaseDante Hickey, Reed College
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2020 Numerical models of lower crustal flow explain Yellowstone's "tectonic parabola"
07 Oct 2021 | | 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...
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2019 The Release of the GEM Global Active Faults Database and Global Seismic Hazard Map
04 Feb 2021 | | 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...
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2019 HeFESTO: A tool for exploring Earth's physical properties and their effects on mantle dynamics
04 Feb 2021 | | 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...
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2019 Introduction to Quagmire
04 Feb 2021 | | 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...
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2018 Introduction to thermal-mechanical lithosphere models with surface processes
04 Feb 2021 | | 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...
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2018 Pythonic Geodynamics
04 Feb 2021 | | 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...
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2017 Geodynamic modeling with staggered finite differences and marker in cell: theory, teaching and examples
04 Feb 2021 | | 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...
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2017 Introduction to the spectral-infinite-element method
04 Feb 2021 | | 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...
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2016 Software Practices in Computational Science Communities – an Overview
04 Feb 2021 | | 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...
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2016 Resolution analysis by random probing
04 Feb 2021 | | 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...
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2016 Statistical and computational challenges of constraining greenhouse gas budgets
04 Feb 2021 | | Contributor(s):: Anna M. Michalak
Predicting future changes to the global carbon cycle (and therefore climate) and quantifying anthropogenic emissions of greenhouse gases (GHGs) both require an understanding of net GHGs emissions and uptake across a variety of spatial and temporal scales. This talk will explore some of the...
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2016 Uncertainty Quantification in Computational Models of Physical Systems
04 Feb 2021 | | Contributor(s):: Habib Najm
Models of physical systems typically involve inputs/parameters that are determined from empirical measurements, and therefore exhibit a certain degree of uncertainty. Estimating the propagation of this uncertainty into computational model output predictions is crucial for purposes...
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2016 Verification, Validation, and Predictive Capability: What's What?
04 Feb 2021 | | Contributor(s):: William Oberkampf
Engineering and geosciences organizations must increasingly rely on computational simulation for the design, predicted response, and performance of manmade and natural systems. Computational analysts, decision makers, and regulatory authorities who rely on simulation should have practical...
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2015 ASPECT: From Benchmarking to 3D Subduction Applications
04 Feb 2021 | | Contributor(s):: Cedric Thieulot, Anne Glerum, Menno Fraters, Wim Spakman
ASPECT, the Advanced Solver for Problems in Earth's Convection, is an extensible open source, community supported code. The code is being applied to a broad range of problems in geodynamics. This talk will explore the community's efforts in benchmarking, implementation of...
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2015 An introduction to Virtual Quake
04 Feb 2021 | | Contributor(s):: Kasey Schultz, John Wilson
This webinar will introduce Virtual Quake, a boundary element code that performs simulations of fault systems based on stress interactions between fault elements to understand long term statistical behavior. The webinar will cover:Downloading, installing and running Virtual...
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2015 Simulating seismic wave propagation with SW4
04 Feb 2021 | | Contributor(s):: Anders Petersson
This webinar describes how to use the SW4 code to simulate ground motion due to earthquakes. After a brief overview of the numerical method, we describe how to set up a simulation in terms of seismic sources, the material model, visco-elastic attenuation, and topography. We also present some of...
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2015 An introduction to BurnMan - a mineral physics toolkit
03 Feb 2021 | | Contributor(s):: Sanne Cottar, Timo Heister, Bob Myhill, Ian Rose, Cayman Unterborn
In this webinar we will introduce the extensible, open source mineral physics toolkit BurnMan. This software allows the user to calculate the elastic and thermodynamic properties of rocks, minerals, fluids and melts based on the properties of end-member phases. BurnMan is bundled with...
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Nov 12 2020
2020 Numerical models of lower crustal flow explain Yellowstone's "tectonic parabola"
Jonathan Perry-Houts, UC Davis. Several hypotheses exist for the origin of the seismically active region of high topography surrounding the Yellowstone hotspot track. Among these is the idea...
https://geodynamics.org/events/details/7
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May 14 2020
2020 Discovering and addressing social challenges during the evolution of scientific software projects
Rene Gassmoeller, CIG UC DavisIn the last decade geodynamic software projects have increasingly incorporated state-of-the-art technical best practices like version control, documentation,...
https://geodynamics.org/events/details/198
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Apr 16 2020
2020 Geodynamic inversion: Methods to link models with data & how that helps to obtain insights in the physics and rheology of the lithosphere
Boris Kaus, Tobias Baumann, Georg Reuber, and Anton Popov; Institute of Geosciences, Johannes Gutenberg University, Mainz[All 2019-20 webinars] [YouTube]
https://geodynamics.org/events/details/197
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Feb 27 2020
2020 Seismic data and data products to motivate, guide, and test geodynamic models of the lithosphere and upper mantle
Brandon Schmandt, University of New MexicoObservational seismic data and data products are among the major sources of information about structure and multi-scale deformation in the lithosphere...
https://geodynamics.org/events/details/196
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Nov 14 2019
2019 The Release of the GEM Global Active Faults Database and Global Seismic Hazard Map
Richard Styron, GEM FoundationIn late 2018, the Global Earthquake Model Foundation (GEM) released the initial version of several major products relating to seismic hazard and risk, including...
https://geodynamics.org/events/details/195
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May 16 2019
2019 Thermodynamic calculations and model generation using ENKI
Mark Ghiorso, OFM ResearchENKI is a collaborative, web-based model-configuration and testing portal that provides tools in computational thermodynamics and fluid dynamics. The ENKI...
https://geodynamics.org/events/details/194
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May 09 2019
2019 HeFESTO: A tool for exploring Earth’s physical properties and their effects on mantle dynamics
Carolina Lithgow-Bertelloni, UCLA The minerals that exist at the extreme pressure and temperature conditions of the mantle and their physical properties determine the dynamics of the mantle....
https://geodynamics.org/events/details/193
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Apr 11 2019
2019 TerraFERMA: a framework for rapidly building finite element models in geodynamics
Cian Wilson, Carnegie Science, DTM, Modern, advanced, open-source computational libraries are giving an increasing amount of power to researchers to develop customized numerical models, tailor...
https://geodynamics.org/events/details/192
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Feb 14 2019
2019 Conducting Reproducible Science with Sciunits
Tanu Malik, DePaul UniversityEunseo Choi, University of MemphisScience is conducted collaboratively and often requires sharing of computational experiments. An experiment often includes diverse...
https://geodynamics.org/events/details/191
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Jan 31 2019
2019 Introduction to Quagmire
Louis Moresi, University of MelbourneBen Mather, University of SydneyQuagmire is an open source, parallel python module for modelling surface processes and landscape evolution. It comes from the...
https://geodynamics.org/events/details/190
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Nov 08 2018
2018 Introduction to thermal-mechanical lithosphere models with surface processes
Louis Moresi and Romain Beucher, University of MelbourneSurface processes including erosion, transport and sedimentation have the potential to strongly influence crustal and lithospheric...
https://geodynamics.org/events/details/189
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May 10 2018
2018 ASPECT 2.0: Improved architecture, new features
Rene Gassmöller, Juliane Dannberg and John Naliboff, UC Davis[All 2017-18 webinars] [YouTube]
https://geodynamics.org/events/details/188
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Apr 17 2018
2018 New developments in AxiSEM/Instaseis for seismic wave propagation on local scales
Lion Krischer, Simon Staehler, and Martin van Driel, ETH Zurich; Tarje Nissen-Meyer, Oxford UniversityInstaseis (http://instaseis.net) is a Python tool to quickly...
https://geodynamics.org/events/details/187
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Mar 08 2018
2018 Where have all the dimensions gone? Hands on methods for introducing students to non-dimensional numbers in laboratory and numerical modeling
Eric Mittelstaedt, University of IdahoExperienced modelers are familiar with how non-dimensionalizing mathematical systems can help improve numerical stability, reduce the number of free variables...
https://geodynamics.org/events/details/186
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Feb 08 2018
2018 Pythonic Geodynamics
Gabriele Morra, University of Louisiana at LafayetteStudents and young researchers who want to learn to use computational tools for geodynamic modeling have the option to choose among a wide range...
https://geodynamics.org/events/details/185
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Nov 16 2017
2017 Tools and approaches for teaching computation and modeling: geodynamics and beyond
Max Rudolph, University of California, DavisI will share experiences teaching computation and modeling using a variety of tools and techniques. First, I will present my philosophy and approach to...
https://geodynamics.org/events/details/184
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Oct 12 2017
2017 Geodynamic modeling with staggered finite differences and marker in cell: theory, teaching and examples
Taras Gerya, ETH ZurichNumerical 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...
https://geodynamics.org/events/details/183
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Apr 13 2017
2017 An overview of PyLith plus a preview of multiphysics and other features coming in PyLith v3.0
Brad Aagaard, USGSI will give an overview of PyLith, including a discussion of the types of applications for which it is designed, the features currently available, and the user workflow...
https://geodynamics.org/events/details/182
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Mar 09 2017
2017 Introduction to the spectral-infinite-element method
Hom Nath Gharti and Jeroen Tromp, Princeton UniversityThe governing equations for the elastic-gravitational deformation of an Earth model involve a perturbed gravitational potential. The...
https://geodynamics.org/events/details/181
