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Properties and biases of the global heat flow compilation

Citation

Staal, T and Reading, AM and Fuchs, S and Halpin, JA and Losing, M and Turner, RJ, Properties and biases of the global heat flow compilation, Frontiers in Earth Science, 10 Article 963525. ISSN 2296-6463 (2022) [Refereed Article]


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Copyright Statement

© 2022 Stål, Reading, Fuchs, Halpin, Lösing and Turner. This article is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) License, (https://creativecommons.org/licenses/by/4.0/), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

DOI: doi:10.3389/feart.2022.963525

Abstract

Geothermal heat flow is inferred from the gradient of temperature values in boreholes or short-penetration probe measurements. Such measurements are expensive and logistically challenging in remote locations and, therefore, often targeted to regions of economic interest. As a result, measurements are not distributed evenly. Some tectonic, geologic and even topographic settings are overrepresented in global heat flow compilations; other settings are underrepresented or completely missing. These limitations in representation have implications for empirical heat flow models that use catalogue data to assign heat flow by the similarity of observables. In this contribution, we analyse the sampling bias in the Global Heat Flow database of the International Heat Flow Commission; the most recent and extensive heat flow catalogue, and discuss the implications for accurate prediction and global appraisals. We also suggest correction weights to reduce the bias when the catalogue is used for empirical modelling. From comparison with auxiliary variables, we find that each of the following settings is highly overrepresented for heat flow measurements; continental crust, sedimentary rocks, volcanic rocks, and Phanerozoic regions with hydrocarbon exploration. Oceanic crust, cratons, and metamorphic rocks are underrepresented. The findings also suggest a general tendency to measure heat flow in areas where the values are elevated; however, this conclusion depends on which auxiliary variable is under consideration to determine the settings. We anticipate that using our correction weights to balance disproportional representation will improve empirical heat flow models for remote regions and assist in the ongoing assessment of the Global Heat Flow database.

Item Details

Item Type:Refereed Article
Keywords:geothermal heat flow, tectonics, continental crust, compilation, thermal, regionalisation, geomorphometrics
Research Division:Earth Sciences
Research Group:Geophysics
Research Field:Geothermics and radiometrics
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the earth sciences
UTAS Author:Staal, T (Dr Tobias Staal)
UTAS Author:Reading, AM (Professor Anya Reading)
UTAS Author:Halpin, JA (Dr Jacqueline Halpin)
UTAS Author:Turner, RJ (Dr Ross Turner)
ID Code:153021
Year Published:2022
Web of Science® Times Cited:1
Deposited By:Oceans and Cryosphere
Deposited On:2022-09-01
Last Modified:2022-11-23
Downloads:3 View Download Statistics

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