Louis Moresi

Professor in Computational Geophysics / Geodynamics at the Australian National University. Specialist in numerical modeling of non-linear Earth processes and leader of the Underworld Geodynamics Group
An automated (zotero) bibliography in a webpage
Tricks of the Trade

An automated (zotero) bibliography in a webpage

How we added an auto-updating set of citations to underworld in our publications webpage. We need to curate all the publications that we can find that use the underworld geodynamics code and provide this information on our website. To avoid needless repetition, we take advantage of the fact that nearly
3 min read
Viscoelasticity in Underworld2
Geodynamics

Viscoelasticity in Underworld2

Viscoelastic materials exhibit the properies of both solids and liquids, with deformation rates dependent on both the viscous stress and elastic stress rate.  In a Maxwell viscoelastic material the strain rate $D$ is proportional to the sum of the stress $\tau$ and the stress rate $\dot\tau$, \begin{equation} D_
Alaska Moho Model (Reproducible research with containers)
Stripy

Alaska Moho Model (Reproducible research with containers)

Making your research reproducible means that you provide the entire workflow from data, through software and post-processing freely available. Not only can somebody repeat your experiments and verify them, they can build upon them. In lab-based disciplines, there are many further challenges, but in research that is predominantly based on
2 min read
Cite Underworld from Zenodo
Documentation

Cite Underworld from Zenodo

Zenodo is a repository for immutable versions of software that are provided with a persistent DOI for the purposes of citation and reproducibility.   Underworld can be cited via a zenodo DOI. There is a master DOI for all releases (10.5281/zenodo.1436039) and releases after 2.6.0 are
1 min read
Craton Formation and the Onset of Plate Tectonics
Geodynamics

Craton Formation and the Onset of Plate Tectonics

(they don't make them like they used to ... ) Cratons are anomalously-strong regions of the continents that have largely resisted tectonic forces for billions of years. How such strong zones could be forged in a hot, low-viscosity, low stress,  early-Earth has been a long-standing puzzle for geologists. Adam Beall, Katie Cooper
4 min read
Modelling Drips and Delamination with Underworld
Geodynamics

Modelling Drips and Delamination with Underworld

Modelling the relative time-scales of the Rayleigh-Taylor Instability and delamination, using Underworld With Adam Beall, Cardiff University. Why model sub-continental gravitational instabilities? Within the plate tectonics framework, continents are generally considered to have a much lower density than the asthenosphere below and therefore avoid the kind of recycling that the
7 min read
Shear Bands with Dilatancy modelled with Underworld
Geodynamics

Shear Bands with Dilatancy modelled with Underworld

In honour of Hans Mühlhaus' 70th birthday this month, here are some shear band simulations made with Underworld. We are investigating the role of dilatancy in the geometry of the shear bands for a box of material when a small trapdoor is opened. The extent to which large-scale deformation is
1 min read
Underworld and Docker (part 2)
AuScope UW Cloud

Underworld and Docker (part 2)

By the way, before you read this post, catch up with how we use docker by reading part 1 Docker allows us to distribute pre-built applications which are hosted in a virtual machine and are therefore platform independent. This simplifies things for us (only one platform we need to support)
4 min read
Underworld 2
Underworld Code

Underworld 2

(aka the Underworld renovation project) Underworld is our parallel, particle-in-cell, finite element geodynamics code [1]. For the past year or so, the Underworld team has been working on a refurbished user interface. We've known for a long time that it needed to be done but we finally bit the bullet.
7 min read
The Dynamics of Continental Accretion
Geodynamics

The Dynamics of Continental Accretion

Congested subduction In a recent paper [1], we used Underworld models to examine subduction congestion associated with the ingestion of a continental ribbon. The SE Australian geological record turned out to be a wonderful place to study this process. Here is a short summary of the work for a relatively
5 min read