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WITHDRAWN Towards Decadal Scale Global Geodynamic Models

Description: 

WITHDRAWN Our goal is to lay the foundations for a novel research field of “Decadal Scale Global Geodynamics” that connects deep mantle flow and plate boundary dynamics to changes in the uplift rates and stress patterns at the Earth's surface that occur on human timescales. With the precision and coverage of satellite remote sensing achieving accuracies below the millimetre scale, the fact that the solid Earth is an actively deforming fluid body is now a substantial correction that must be made before the details in these signals can be interpreted. For example, we can consider the interaction between short and long timescales in the great subduction systems, and how this changes the Earth's tectonically driven topography and stress field at human timescales.

First, we demonstrate that our large-deformation, particle-based tectonic modeling code (Underworld) can also be used to simulate aspects of the Earthquake cycle and we compare our outputs to those of the common benchmarks. In particular, we show how mesh / particle-field deformation affects (degrades) our ability to match those benchmarks. We consider which signals will be robust in large-deformation models.

Second, we consider the global surface relaxation problem which occurs at the intermediate timescale between the Earthquake cycle and the tectonic timescales. We consider the modelling tools that are needed to be able to connect the timescales and the trade-offs that we expect to find in developing these coupled methods.

Session: From Earthquakes to Plate Boundaries: Insights Into Fault Behavior Spanning Seconds to Millennia

Type: Oral

Date: 4/20/2023

Presentation Time: 05:30 PM (local time)

Presenting Author: Louis Moresi

Student Presenter: No

Invited Presentation: 

Authors