How do we see fractures? Quantifying subjective bias in fracture data collection
Andrews, Billy J. and Roberts, Jennifer J. and Shipton, Zoe K. and Bigi, Sabina and Tartarello, M. Chiara and Johnson, Gareth (2019) How do we see fractures? Quantifying subjective bias in fracture data collection. Solid Earth, 10 (2). pp. 487-516. ISSN 1869-9529 (https://doi.org/10.5194/se-10-487-2019)
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Abstract
The characterisation of natural fracture networks using outcrop analogues is important in understanding subsurface fluid flow and rock mass characteristics in fractured lithologies. It is well known from decision sciences that subjective bias can significantly impact the way data are gathered and interpreted, introducing scientific uncertainty. This study investigates the scale and nature of subjective bias on fracture data collected using four commonly applied approaches (linear scanlines, circular scanlines, topology sampling, and window sampling) both in the field and in workshops using field photographs. We demonstrate that geologists' own subjective biases influence the data they collect, and, as a result, different participants collect different fracture data from the same scanline or sample area. As a result, the fracture statistics that are derived from field data can vary considerably for the same scanline, depending on which geologist collected the data. Additionally, the personal bias of geologists collecting the data affects the scanline size (minimum length of linear scanlines, radius of circular scanlines, or area of a window sample) needed to collect a statistically representative amount of data. Fracture statistics derived from field data are often input into geological models that are used for a range of applications, from understanding fluid flow to characterising rock strength. We suggest protocols to recognise, understand, and limit the effect of subjective bias on fracture data biases during data collection. Our work shows the capacity for cognitive biases to introduce uncertainty into observation-based data and has implications well beyond the geosciences.
ORCID iDs
Andrews, Billy J., Roberts, Jennifer J. ORCID: https://orcid.org/0000-0003-4505-8524, Shipton, Zoe K. ORCID: https://orcid.org/0000-0002-2268-7750, Bigi, Sabina, Tartarello, M. Chiara and Johnson, Gareth ORCID: https://orcid.org/0000-0002-3151-5045;-
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Item type: Article ID code: 67582 Dates: DateEvent11 April 2019Published27 March 2019Accepted20 December 2018SubmittedSubjects: Science > Geology
Technology > Engineering (General). Civil engineering (General) > Environmental engineeringDepartment: Faculty of Engineering > Civil and Environmental Engineering Depositing user: Pure Administrator Date deposited: 16 Apr 2019 11:32 Last modified: 22 Dec 2024 01:22 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/67582