Quantifying model structural uncertainty using airborne electromagnetic data

Geophysical Journal International
By: , and 

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Abstract

The ability to quantify structural uncertainty in geological models that incorporate geophysical data is affected by two primary sources of uncertainty: geophysical parameter uncertainty and uncertainty in the relationship between geophysical parameters and geological properties of interest. Here, we introduce an open-source, trans-dimensional Bayesian Markov chain Monte Carlo (McMC) algorithm GeoBIPy—Geophysical Bayesian Inference in Python—for robust uncertainty analysis of time-domain or frequency-domain airborne electromagnetic (AEM) data. The McMC algorithm provides a robust assessment of geophysical parameter uncertainty using a trans-dimensional approach that lets the AEM data inform the level of model complexity necessary by allowing the number of model layers itself to be an unknown parameter. Additional components of the Bayesian algorithm allow the user to solve for parameters such as data errors or corrections to the measured instrument height above ground. Probability distributions for a user-specified number of lithologic classes are developed through posterior clustering of McMC-derived resistivity models. Estimates of geological model structural uncertainty are thus obtained through the joint probability of geophysical parameter uncertainty and the uncertainty in the definition of each class. Examples of the implementation of this algorithm are presented for both time-domain and frequency-domain AEM data acquired in Nebraska, USA.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Quantifying model structural uncertainty using airborne electromagnetic data
Series title Geophysical Journal International
DOI 10.1093/gji/ggaa393
Edition Online First
Year Published 2020
Language English
Publisher Royal Astronomical Society
Contributing office(s) Geology, Geophysics, and Geochemistry Science Center
Country United States
State Nebraska
Online Only (Y/N) Y
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