Optimization of Cost Functions in Absolute Plate Motion Modeling

TL;DR

This paper enhances absolute plate motion modeling by refining optimization techniques and hotspot cost functions, leading to more accurate and reliable reconstructions of tectonic plate movements over geological timescales.

Contribution

It introduces a simplified hotspot cost function and a pre-interpolation approach, improving model accuracy and reducing errors in tectonic reconstructions.

Findings

Improved hotspot cost function formulation.

Enhanced accuracy of plate motion reconstructions.

Reduced propagation of modeling errors.

Abstract

We consider the implementation of optimization techniques within the study of tectonic plate motion. Specifically, we examine the optimization underlying optAPM, a leading code for modeling absolute plate motion. We highlight that modifications in the construction of the objective function, composed of individual cost functions, can improve modelling performance. In particular, we propose a simpler and more intuitive formulation of the hotspot cost function. A key part of the new hotspot analysis is the pre-interpolation of hotspot trail data, crucial geological markers for validating absolute plate motion over O(100) Myr timescales. By reducing the propagation of modeling errors, our refined model provides more precise reconstructions of historical plate movements. Our modified hotspot modelling improves the accuracy and reliability of the optAPM outputs.